Putnam Asset Allocation Funds N-CSR22 Nov 24Certified annual shareholder report (management investment company)Financial data

Company Profile

Form N-CSR Cover

Form N-CSR Cover	12 Months Ended
Form N-CSR Cover	Sep. 30, 2024
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	Putnam Asset Allocation Funds
Entity Central Index Key	0000914209
Entity Investment Company Type	N-1A
Document Period End Date	Sep. 30, 2024

Shareholder Report

Shareholder Report	12 Months Ended
Shareholder Report	Sep. 30, 2024 USD ($) $ / shares
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	Putnam Asset Allocation Funds
Entity Central Index Key	0000914209
Entity Investment Company Type	N-1A
Document Period End Date	Sep. 30, 2024
Class A
Shareholder Report [Line Items]
Fund Name	Putnam Dynamic Asset Allocation Conservative Fund
Class Name	Class A
Trading Symbol	PACAX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Dynamic Asset Allocation Conservative Fund for the period October 1, 2023, to September 30, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $110 1.00%
Expenses Paid, Amount	$ 110
Expense Ratio, Percent	1%
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended September 30, 2024, Class A shares of Putnam Dynamic Asset Allocation Conservative Fund returned 20.64%. The Fund compares its performance to the Bloomberg U.S. Aggregate Index and the Putnam Conservative Blended Benchmark¹, which returned 11.57% and 18.04%, respectively, for the same period. PERFORMANCE HIGHLIGHTS Top contributors to performance: Security selection decisions within these strategies: ↑ U.S. Large Cap Value Equity strategy ↑ U.S. Large Cap Growth Equity strategy ↑ Core International Enhanced Equity strategy Top detractors from performance: Security selection decisions within these strategies: ↓ International Equity Fundamental strategy ↓ High Yield Fixed Income strategy Use of derivatives and the impact on performance: The Fund used futures to help manage exposure to market risk, hedge prepayment and interest-rate risks, gain exposure to interest rates, and equitize cash, which had a negative effect on performance over the period.
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended September 30, 2024 1 Year 5 Year 10 Year Class A 20.64 4.53 4.45 Class A (with sales charge) 13.71 3.30 3.83 Bloomberg U.S. Aggregate Index 11.57 0.33 1.84 Putnam Conservative Blended Benchmark 1 18.04 4.79 5.09	[1]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Material Change Date	Oct. 01, 2023
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 584,821,853
Holdings Count \| $ / shares	2,077	[2]
Advisory Fees Paid, Amount	$ 2,808,701
Investment Company Portfolio Turnover	372%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of September 30, 2024) Total Net Assets $584,821,853 Total Number of Portfolio Holdings * 2,077 Total Management Fee Paid $2,808,701 Portfolio Turnover Rate 372%	[2]
Holdings [Text Block]		[3]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisors, Putnam Investments Limited (“PIL”) and The Putnam Advisory Company, LLC (“PAC”), indirect, wholly-owned subsidiaries of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and new sub-advisory contracts with PIL and PAC. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL and sub-advisory agreement with PIL and PAC in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new sub-advisory agreement. This is a summary of certain changes to the Fund since October 1, 2023 . For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by February 1, 2025, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class C
Shareholder Report [Line Items]
Fund Name	Putnam Dynamic Asset Allocation Conservative Fund
Class Name	Class C
Trading Symbol	PACCX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Dynamic Asset Allocation Conservative Fund for the period October 1, 2023, to September 30, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $192 1.75%
Expenses Paid, Amount	$ 192
Expense Ratio, Percent	1.75%
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended September 30, 2024, Class C shares of Putnam Dynamic Asset Allocation Conservative Fund returned 19.63%. The Fund compares its performance to the Bloomberg U.S. Aggregate Index and the Putnam Conservative Blended Benchmark¹, which returned 11.57% and 18.04%, respectively, for the same period. PERFORMANCE HIGHLIGHTS Top contributors to performance: Security selection decisions within these strategies: ↑ U.S. Large Cap Value Equity strategy ↑ U.S. Large Cap Growth Equity strategy ↑ Core International Enhanced Equity strategy Top detractors from performance: Security selection decisions within these strategies: ↓ International Equity Fundamental strategy ↓ High Yield Fixed Income strategy Use of derivatives and the impact on performance: The Fund used futures to help manage exposure to market risk, hedge prepayment and interest-rate risks, gain exposure to interest rates, and equitize cash, which had a negative effect on performance over the period.
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended September 30, 2024 1 Year 5 Year 10 Year Class C 19.63 3.74 3.82 Class C (with sales charge) 18.63 3.74 3.82 Bloomberg U.S. Aggregate Index 11.57 0.33 1.84 Putnam Conservative Blended Benchmark 1 18.04 4.79 5.09	[4]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Material Change Date	Oct. 01, 2023
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 584,821,853
Holdings Count \| $ / shares	2,077	[5]
Advisory Fees Paid, Amount	$ 2,808,701
Investment Company Portfolio Turnover	372%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of September 30, 2024) Total Net Assets $584,821,853 Total Number of Portfolio Holdings * 2,077 Total Management Fee Paid $2,808,701 Portfolio Turnover Rate 372%	[5]
Holdings [Text Block]		[6]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisors, Putnam Investments Limited (“PIL”) and The Putnam Advisory Company, LLC (“PAC”), indirect, wholly-owned subsidiaries of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and new sub-advisory contracts with PIL and PAC. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL and sub-advisory agreement with PIL and PAC in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new sub-advisory agreement. This is a summary of certain changes to the Fund since October 1, 2023 . For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by February 1, 2025, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class P
Shareholder Report [Line Items]
Fund Name	Putnam Dynamic Asset Allocation Conservative Fund
Class Name	Class P
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Dynamic Asset Allocation Conservative Fund for the period October 1, 2023, to September 30, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class P $70 0.63%
Expenses Paid, Amount	$ 70
Expense Ratio, Percent	0.63%
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended September 30, 2024, Class P shares of Putnam Dynamic Asset Allocation Conservative Fund returned 20.98%. The Fund compares its performance to the Bloomberg U.S. Aggregate Index and the Putnam Conservative Blended Benchmark¹, which returned 11.57% and 18.04%, respectively, for the same period. PERFORMANCE HIGHLIGHTS Top contributors to performance: Security selection decisions within these strategies: ↑ U.S. Large Cap Value Equity strategy ↑ U.S. Large Cap Growth Equity strategy ↑ Core International Enhanced Equity strategy Top detractors from performance: Security selection decisions within these strategies: ↓ International Equity Fundamental strategy ↓ High Yield Fixed Income strategy Use of derivatives and the impact on performance: The Fund used futures to help manage exposure to market risk, hedge prepayment and interest-rate risks, gain exposure to interest rates, and equitize cash, which had a negative effect on performance over the period.
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended September 30, 2024 1 Year 5 Year 10 Year Class P 20.98 4.93 4.82 Bloomberg U.S. Aggregate Index 11.57 0.33 1.84 Putnam Conservative Blended Benchmark 1 18.04 4.79 5.09	[7]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Material Change Date	Oct. 01, 2023
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 584,821,853
Holdings Count \| $ / shares	2,077	[8]
Advisory Fees Paid, Amount	$ 2,808,701
Investment Company Portfolio Turnover	372%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of September 30, 2024) Total Net Assets $584,821,853 Total Number of Portfolio Holdings * 2,077 Total Management Fee Paid $2,808,701 Portfolio Turnover Rate 372%	[8]
Holdings [Text Block]		[9]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisors, Putnam Investments Limited (“PIL”) and The Putnam Advisory Company, LLC (“PAC”), indirect, wholly-owned subsidiaries of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and new sub-advisory contracts with PIL and PAC. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL and sub-advisory agreement with PIL and PAC in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new sub-advisory agreement. This is a summary of certain changes to the Fund since October 1, 2023 . For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by February 1, 2025, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R
Shareholder Report [Line Items]
Fund Name	Putnam Dynamic Asset Allocation Conservative Fund
Class Name	Class R
Trading Symbol	PACRX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Dynamic Asset Allocation Conservative Fund for the period October 1, 2023, to September 30, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R $138 1.25%
Expenses Paid, Amount	$ 138
Expense Ratio, Percent	1.25%
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended September 30, 2024, Class R shares of Putnam Dynamic Asset Allocation Conservative Fund returned 20.20%. The Fund compares its performance to the Bloomberg U.S. Aggregate Index and the Putnam Conservative Blended Benchmark¹, which returned 11.57% and 18.04%, respectively, for the same period. PERFORMANCE HIGHLIGHTS Top contributors to performance: Security selection decisions within these strategies: ↑ U.S. Large Cap Value Equity strategy ↑ U.S. Large Cap Growth Equity strategy ↑ Core International Enhanced Equity strategy Top detractors from performance: Security selection decisions within these strategies: ↓ International Equity Fundamental strategy ↓ High Yield Fixed Income strategy Use of derivatives and the impact on performance: The Fund used futures to help manage exposure to market risk, hedge prepayment and interest-rate risks, gain exposure to interest rates, and equitize cash, which had a negative effect on performance over the period.
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended September 30, 2024 1 Year 5 Year 10 Year Class R 20.20 4.27 4.18 Bloomberg U.S. Aggregate Index 11.57 0.33 1.84 Putnam Conservative Blended Benchmark 1 18.04 4.79 5.09	[10]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Material Change Date	Oct. 01, 2023
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 584,821,853
Holdings Count \| $ / shares	2,077	[11]
Advisory Fees Paid, Amount	$ 2,808,701
Investment Company Portfolio Turnover	372%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of September 30, 2024) Total Net Assets $584,821,853 Total Number of Portfolio Holdings * 2,077 Total Management Fee Paid $2,808,701 Portfolio Turnover Rate 372%	[11]
Holdings [Text Block]		[12]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisors, Putnam Investments Limited (“PIL”) and The Putnam Advisory Company, LLC (“PAC”), indirect, wholly-owned subsidiaries of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and new sub-advisory contracts with PIL and PAC. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL and sub-advisory agreement with PIL and PAC in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new sub-advisory agreement. This is a summary of certain changes to the Fund since October 1, 2023 . For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by February 1, 2025, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R5
Shareholder Report [Line Items]
Fund Name	Putnam Dynamic Asset Allocation Conservative Fund
Class Name	Class R5
Trading Symbol	PACDX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Dynamic Asset Allocation Conservative Fund for the period October 1, 2023, to September 30, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R5 $82 0.74%
Expenses Paid, Amount	$ 82
Expense Ratio, Percent	0.74%
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended September 30, 2024, Class R5 shares of Putnam Dynamic Asset Allocation Conservative Fund returned 20.92%. The Fund compares its performance to the Bloomberg U.S. Aggregate Index and the Putnam Conservative Blended Benchmark¹, which returned 11.57% and 18.04%, respectively, for the same period. PERFORMANCE HIGHLIGHTS Top contributors to performance: Security selection decisions within these strategies: ↑ U.S. Large Cap Value Equity strategy ↑ U.S. Large Cap Growth Equity strategy ↑ Core International Enhanced Equity strategy Top detractors from performance: Security selection decisions within these strategies: ↓ International Equity Fundamental strategy ↓ High Yield Fixed Income strategy Use of derivatives and the impact on performance: The Fund used futures to help manage exposure to market risk, hedge prepayment and interest-rate risks, gain exposure to interest rates, and equitize cash, which had a negative effect on performance over the period.
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended September 30, 2024 1 Year 5 Year 10 Year Class R5 20.92 4.82 4.76 Bloomberg U.S. Aggregate Index 11.57 0.33 1.84 Putnam Conservative Blended Benchmark 1 18.04 4.79 5.09	[13]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Material Change Date	Oct. 01, 2023
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 584,821,853
Holdings Count \| $ / shares	2,077	[14]
Advisory Fees Paid, Amount	$ 2,808,701
Investment Company Portfolio Turnover	372%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of September 30, 2024) Total Net Assets $584,821,853 Total Number of Portfolio Holdings * 2,077 Total Management Fee Paid $2,808,701 Portfolio Turnover Rate 372%	[14]
Holdings [Text Block]		[15]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisors, Putnam Investments Limited (“PIL”) and The Putnam Advisory Company, LLC (“PAC”), indirect, wholly-owned subsidiaries of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and new sub-advisory contracts with PIL and PAC. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL and sub-advisory agreement with PIL and PAC in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new sub-advisory agreement. This is a summary of certain changes to the Fund since October 1, 2023 . For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by February 1, 2025, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R6
Shareholder Report [Line Items]
Fund Name	Putnam Dynamic Asset Allocation Conservative Fund
Class Name	Class R6
Trading Symbol	PCCEX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Dynamic Asset Allocation Conservative Fund for the period October 1, 2023, to September 30, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R6 $74 0.67%
Expenses Paid, Amount	$ 74
Expense Ratio, Percent	0.67%
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended September 30, 2024, Class R6 shares of Putnam Dynamic Asset Allocation Conservative Fund returned 20.93%. The Fund compares its performance to the Bloomberg U.S. Aggregate Index and the Putnam Conservative Blended Benchmark¹, which returned 11.57% and 18.04%, respectively, for the same period. PERFORMANCE HIGHLIGHTS Top contributors to performance: Security selection decisions within these strategies: ↑ U.S. Large Cap Value Equity strategy ↑ U.S. Large Cap Growth Equity strategy ↑ Core International Enhanced Equity strategy Top detractors from performance: Security selection decisions within these strategies: ↓ International Equity Fundamental strategy ↓ High Yield Fixed Income strategy Use of derivatives and the impact on performance: The Fund used futures to help manage exposure to market risk, hedge prepayment and interest-rate risks, gain exposure to interest rates, and equitize cash, which had a negative effect on performance over the period.
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended September 30, 2024 1 Year 5 Year 10 Year Class R6 20.93 4.88 4.82 Bloomberg U.S. Aggregate Index 11.57 0.33 1.84 Putnam Conservative Blended Benchmark 1 18.04 4.79 5.09	[16]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Material Change Date	Oct. 01, 2023
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 584,821,853
Holdings Count \| $ / shares	2,077	[17]
Advisory Fees Paid, Amount	$ 2,808,701
Investment Company Portfolio Turnover	372%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of September 30, 2024) Total Net Assets $584,821,853 Total Number of Portfolio Holdings * 2,077 Total Management Fee Paid $2,808,701 Portfolio Turnover Rate 372%	[17]
Holdings [Text Block]		[18]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisors, Putnam Investments Limited (“PIL”) and The Putnam Advisory Company, LLC (“PAC”), indirect, wholly-owned subsidiaries of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and new sub-advisory contracts with PIL and PAC. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL and sub-advisory agreement with PIL and PAC in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new sub-advisory agreement. This is a summary of certain changes to the Fund since October 1, 2023 . For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by February 1, 2025, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class Y
Shareholder Report [Line Items]
Fund Name	Putnam Dynamic Asset Allocation Conservative Fund
Class Name	Class Y
Trading Symbol	PACYX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Dynamic Asset Allocation Conservative Fund for the period October 1, 2023, to September 30, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class Y $83 0.75%
Expenses Paid, Amount	$ 83
Expense Ratio, Percent	0.75%
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended September 30, 2024, Class Y shares of Putnam Dynamic Asset Allocation Conservative Fund returned 20.80%. The Fund compares its performance to the Bloomberg U.S. Aggregate Index and the Putnam Conservative Blended Benchmark¹, which returned 11.57% and 18.04%, respectively, for the same period. PERFORMANCE HIGHLIGHTS Top contributors to performance: Security selection decisions within these strategies: ↑ U.S. Large Cap Value Equity strategy ↑ U.S. Large Cap Growth Equity strategy ↑ Core International Enhanced Equity strategy Top detractors from performance: Security selection decisions within these strategies: ↓ International Equity Fundamental strategy ↓ High Yield Fixed Income strategy Use of derivatives and the impact on performance: The Fund used futures to help manage exposure to market risk, hedge prepayment and interest-rate risks, gain exposure to interest rates, and equitize cash, which had a negative effect on performance over the period.
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended September 30, 2024 1 Year 5 Year 10 Year Class Y 20.80 4.80 4.70 Bloomberg U.S. Aggregate Index 11.57 0.33 1.84 Putnam Conservative Blended Benchmark 1 18.04 4.79 5.09	[19]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Material Change Date	Oct. 01, 2023
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 584,821,853
Holdings Count \| $ / shares	2,077	[20]
Advisory Fees Paid, Amount	$ 2,808,701
Investment Company Portfolio Turnover	372%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of September 30, 2024) Total Net Assets $584,821,853 Total Number of Portfolio Holdings * 2,077 Total Management Fee Paid $2,808,701 Portfolio Turnover Rate 372%	[20]
Holdings [Text Block]		[21]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisors, Putnam Investments Limited (“PIL”) and The Putnam Advisory Company, LLC (“PAC”), indirect, wholly-owned subsidiaries of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and new sub-advisory contracts with PIL and PAC. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL and sub-advisory agreement with PIL and PAC in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new sub-advisory agreement. This is a summary of certain changes to the Fund since October 1, 2023 . For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by February 1, 2025, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents

[1] 1 The Putnam Conservative Blended Benchmark is a blended benchmark comprised of 65% Bloomberg U.S. Aggregate Index, 25% Russell 3000 Index, 5% JPMorgan Developed High Yield Index and 5% MSCI EAFE Index-NR. * Includes derivatives, if applicable. U.S. Money Market Securities, if any, represent the market value weights of cash, short-term securities, and derivative notional offsets in the portfolio. Holdings and allocations may vary over time. 1 The Putnam Conservative Blended Benchmark is a blended benchmark comprised of 65% Bloomberg U.S. Aggregate Index, 25% Russell 3000 Index, 5% JPMorgan Developed High Yield Index and 5% MSCI EAFE Index-NR. * Includes derivatives, if applicable. U.S. Money Market Securities, if any, represent the market value weights of cash, short-term securities, and derivative notional offsets in the portfolio. Holdings and allocations may vary over time. 1 The Putnam Conservative Blended Benchmark is a blended benchmark comprised of 65% Bloomberg U.S. Aggregate Index, 25% Russell 3000 Index, 5% JPMorgan Developed High Yield Index and 5% MSCI EAFE Index-NR. * Includes derivatives, if applicable. U.S. Money Market Securities, if any, represent the market value weights of cash, short-term securities, and derivative notional offsets in the portfolio. Holdings and allocations may vary over time. 1 The Putnam Conservative Blended Benchmark is a blended benchmark comprised of 65% Bloomberg U.S. Aggregate Index, 25% Russell 3000 Index, 5% JPMorgan Developed High Yield Index and 5% MSCI EAFE Index-NR. * Includes derivatives, if applicable. U.S. Money Market Securities, if any, represent the market value weights of cash, short-term securities, and derivative notional offsets in the portfolio. Holdings and allocations may vary over time. 1 The Putnam Conservative Blended Benchmark is a blended benchmark comprised of 65% Bloomberg U.S. Aggregate Index, 25% Russell 3000 Index, 5% JPMorgan Developed High Yield Index and 5% MSCI EAFE Index-NR. * Includes derivatives, if applicable. U.S. Money Market Securities, if any, represent the market value weights of cash, short-term securities, and derivative notional offsets in the portfolio. Holdings and allocations may vary over time. 1 The Putnam Conservative Blended Benchmark is a blended benchmark comprised of 65% Bloomberg U.S. Aggregate Index, 25% Russell 3000 Index, 5% JPMorgan Developed High Yield Index and 5% MSCI EAFE Index-NR. * Includes derivatives, if applicable. U.S. Money Market Securities, if any, represent the market value weights of cash, short-term securities, and derivative notional offsets in the portfolio. Holdings and allocations may vary over time. 1 The Putnam Conservative Blended Benchmark is a blended benchmark comprised of 65% Bloomberg U.S. Aggregate Index, 25% Russell 3000 Index, 5% JPMorgan Developed High Yield Index and 5% MSCI EAFE Index-NR. * Includes derivatives, if applicable. U.S. Money Market Securities, if any, represent the market value weights of cash, short-term securities, and derivative notional offsets in the portfolio. Holdings and allocations may vary over time.

Shareholder Report, Line Graph

Shareholder Report, Line Graph (Details) - USD ($)	12 Months Ended
Shareholder Report, Line Graph (Details) - USD ($)	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Class A
Account Value [Line Items]
Line Graph and Table Measure Name	Class A (with sales charge)
Account Value	$ 14,563	$ 12,071	$ 11,392	$ 13,590	$ 12,452	$ 11,670	$ 11,223	$ 10,878	$ 10,184	$ 9,574	$ 9,425
Class C
Account Value [Line Items]
Line Graph and Table Measure Name	Class C (with sales charge)
Account Value	$ 14,554	12,064	11,384	13,696	12,639	11,933	11,555	11,301	10,649	10,097	10,000
Class P
Account Value [Line Items]
Line Graph and Table Measure Name	Class P
Account Value	$ 16,016	13,239	12,426	14,784	13,488	12,594	12,054	11,649	10,855	10,192	10,000
Class R
Account Value [Line Items]
Line Graph and Table Measure Name	Class R
Account Value	$ 15,065	12,533	11,846	14,169	13,020	12,225	11,790	11,457	10,751	10,138	10,000
Class R5
Account Value [Line Items]
Line Graph and Table Measure Name	Class R5
Account Value	$ 15,917	13,163	12,381	14,733	13,456	12,576	12,062	11,659	10,879	10,198	10,000
Class R6
Account Value [Line Items]
Line Graph and Table Measure Name	Class R6
Account Value	$ 16,011	13,240	12,440	14,790	13,502	12,614	12,081	11,683	10,882	10,204	10,000
Class Y
Account Value [Line Items]
Line Graph and Table Measure Name	Class Y
Account Value	$ 15,837	13,110	12,332	14,676	13,409	12,530	12,025	11,631	10,855	10,192	10,000
Bloomberg U.S. Aggregate Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Bloomberg U.S. Aggregate Index
Account Value	$ 12,004	10,760	10,691	12,518	12,632	11,807	10,705	10,836	10,829	10,294	10,000
Bloomberg U.S. Aggregate Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Bloomberg U.S. Aggregate Index
Account Value	$ 12,004	10,760	10,691	12,518	12,632	11,807	10,705	10,836	10,829	10,294	10,000
Bloomberg U.S. Aggregate Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Bloomberg U.S. Aggregate Index
Account Value	$ 12,004	10,760	10,691	12,518	12,632	11,807	10,705	10,836	10,829	10,294	10,000
Bloomberg U.S. Aggregate Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Bloomberg U.S. Aggregate Index
Account Value	$ 12,004	10,760	10,691	12,518	12,632	11,807	10,705	10,836	10,829	10,294	10,000
Bloomberg U.S. Aggregate Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Bloomberg U.S. Aggregate Index
Account Value	$ 12,004	10,760	10,691	12,518	12,632	11,807	10,705	10,836	10,829	10,294	10,000
Bloomberg U.S. Aggregate Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Bloomberg U.S. Aggregate Index
Account Value	$ 12,004	10,760	10,691	12,518	12,632	11,807	10,705	10,836	10,829	10,294	10,000
Bloomberg U.S. Aggregate Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Bloomberg U.S. Aggregate Index
Account Value	$ 12,004	10,760	10,691	12,518	12,632	11,807	10,705	10,836	10,829	10,294	10,000
Putnam Conservative Blended Benchmark [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Putnam Conservative Blended Benchmark
Account Value	$ 16,428	13,918	12,986	15,389	14,166	13,001	12,037	11,606	10,957	10,129	10,000
Putnam Conservative Blended Benchmark [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Putnam Conservative Blended Benchmark
Account Value	$ 16,428	13,918	12,986	15,389	14,166	13,001	12,037	11,606	10,957	10,129	10,000
Putnam Conservative Blended Benchmark [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Putnam Conservative Blended Benchmark
Account Value	$ 16,428	13,918	12,986	15,389	14,166	13,001	12,037	11,606	10,957	10,129	10,000
Putnam Conservative Blended Benchmark [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Putnam Conservative Blended Benchmark
Account Value	$ 16,428	13,918	12,986	15,389	14,166	13,001	12,037	11,606	10,957	10,129	10,000
Putnam Conservative Blended Benchmark [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Putnam Conservative Blended Benchmark
Account Value	$ 16,428	13,918	12,986	15,389	14,166	13,001	12,037	11,606	10,957	10,129	10,000
Putnam Conservative Blended Benchmark [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Putnam Conservative Blended Benchmark
Account Value	$ 16,428	13,918	12,986	15,389	14,166	13,001	12,037	11,606	10,957	10,129	10,000
Putnam Conservative Blended Benchmark [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Putnam Conservative Blended Benchmark
Account Value	$ 16,428	$ 13,918	$ 12,986	$ 15,389	$ 14,166	$ 13,001	$ 12,037	$ 11,606	$ 10,957	$ 10,129	$ 10,000

Shareholder Report, Average Ann

Shareholder Report, Average Annual Return (Details)		12 Months Ended	60 Months Ended	120 Months Ended
Shareholder Report, Average Annual Return (Details)		Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2024
Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class A (with sales charge)
Average Annual Return, Percent		13.71%	3.30%	3.83%
Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class C (with sales charge)
Average Annual Return, Percent		18.63%	3.74%	3.82%
Class P
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class P
Average Annual Return, Percent		20.98%	4.93%	4.82%
Class R
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class R
Average Annual Return, Percent		20.20%	4.27%	4.18%
Class R5
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class R5
Average Annual Return, Percent		20.92%	4.82%	4.76%
Class R6
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class R6
Average Annual Return, Percent		20.93%	4.88%	4.82%
Class Y
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class Y
Average Annual Return, Percent		20.80%	4.80%	4.70%
Without Sales Load [Member] \| Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class A
Average Annual Return, Percent		20.64%	4.53%	4.45%
Without Sales Load [Member] \| Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class C
Average Annual Return, Percent		19.63%	3.74%	3.82%
Bloomberg U.S. Aggregate Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Average Annual Return, Percent		11.57%	0.33%	1.84%
Bloomberg U.S. Aggregate Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Average Annual Return, Percent		11.57%	0.33%	1.84%
Bloomberg U.S. Aggregate Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Average Annual Return, Percent		11.57%	0.33%	1.84%
Bloomberg U.S. Aggregate Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Average Annual Return, Percent		11.57%	0.33%	1.84%
Bloomberg U.S. Aggregate Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Average Annual Return, Percent		11.57%	0.33%	1.84%
Bloomberg U.S. Aggregate Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Average Annual Return, Percent		11.57%	0.33%	1.84%
Bloomberg U.S. Aggregate Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Average Annual Return, Percent		11.57%	0.33%	1.84%
Putnam Conservative Blended Benchmark [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Putnam Conservative Blended Benchmark
Average Annual Return, Percent	[1]	18.04%	4.79%	5.09%
Putnam Conservative Blended Benchmark [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Putnam Conservative Blended Benchmark
Average Annual Return, Percent	[2]	18.04%	4.79%	5.09%
Putnam Conservative Blended Benchmark [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Putnam Conservative Blended Benchmark
Average Annual Return, Percent	[3]	18.04%	4.79%	5.09%
Putnam Conservative Blended Benchmark [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Putnam Conservative Blended Benchmark
Average Annual Return, Percent	[4]	18.04%	4.79%	5.09%
Putnam Conservative Blended Benchmark [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Putnam Conservative Blended Benchmark
Average Annual Return, Percent	[5]	18.04%	4.79%	5.09%
Putnam Conservative Blended Benchmark [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Putnam Conservative Blended Benchmark
Average Annual Return, Percent	[6]	18.04%	4.79%	5.09%
Putnam Conservative Blended Benchmark [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Putnam Conservative Blended Benchmark
Average Annual Return, Percent	[7]	18.04%	4.79%	5.09%

[1] 1 The Putnam Conservative Blended Benchmark is a blended benchmark comprised of 65% Bloomberg U.S. Aggregate Index, 25% Russell 3000 Index, 5% JPMorgan Developed High Yield Index and 5% MSCI EAFE Index-NR. 1 The Putnam Conservative Blended Benchmark is a blended benchmark comprised of 65% Bloomberg U.S. Aggregate Index, 25% Russell 3000 Index, 5% JPMorgan Developed High Yield Index and 5% MSCI EAFE Index-NR. 1 The Putnam Conservative Blended Benchmark is a blended benchmark comprised of 65% Bloomberg U.S. Aggregate Index, 25% Russell 3000 Index, 5% JPMorgan Developed High Yield Index and 5% MSCI EAFE Index-NR. 1 The Putnam Conservative Blended Benchmark is a blended benchmark comprised of 65% Bloomberg U.S. Aggregate Index, 25% Russell 3000 Index, 5% JPMorgan Developed High Yield Index and 5% MSCI EAFE Index-NR. 1 The Putnam Conservative Blended Benchmark is a blended benchmark comprised of 65% Bloomberg U.S. Aggregate Index, 25% Russell 3000 Index, 5% JPMorgan Developed High Yield Index and 5% MSCI EAFE Index-NR. 1 The Putnam Conservative Blended Benchmark is a blended benchmark comprised of 65% Bloomberg U.S. Aggregate Index, 25% Russell 3000 Index, 5% JPMorgan Developed High Yield Index and 5% MSCI EAFE Index-NR. 1 The Putnam Conservative Blended Benchmark is a blended benchmark comprised of 65% Bloomberg U.S. Aggregate Index, 25% Russell 3000 Index, 5% JPMorgan Developed High Yield Index and 5% MSCI EAFE Index-NR.

Shareholder Report, Holdings (D

Label	Element	Value
Class A \| U.S. Investment-Grade Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	62.80%
Class A \| U.S. Large-Cap Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	22.20%
Class A \| U.S. High-Yield Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	5.10%
Class A \| International Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	4.90%
Class A \| U.S. Small- and Mid-Cap Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	3.50%
Class A \| Commodities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	1.50%

Shareholder Report, Holdings _2

Label	Element	Value
Class C \| U.S. Investment-Grade Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	62.80%
Class C \| U.S. Large-Cap Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	22.20%
Class C \| U.S. High-Yield Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	5.10%
Class C \| International Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	4.90%
Class C \| U.S. Small- and Mid-Cap Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	3.50%
Class C \| Commodities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	1.50%

Shareholder Report, Holdings _3

Label	Element	Value
Class P \| U.S. Investment-Grade Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	62.80%
Class P \| U.S. Large-Cap Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	22.20%
Class P \| U.S. High-Yield Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	5.10%
Class P \| International Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	4.90%
Class P \| U.S. Small- and Mid-Cap Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	3.50%
Class P \| Commodities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	1.50%

Shareholder Report, Holdings _4

Label	Element	Value
Class R \| U.S. Investment-Grade Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	62.80%
Class R \| U.S. Large-Cap Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	22.20%
Class R \| U.S. High-Yield Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	5.10%
Class R \| International Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	4.90%
Class R \| U.S. Small- and Mid-Cap Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	3.50%
Class R \| Commodities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	1.50%

Shareholder Report, Holdings _5

Label	Element	Value
Class R5 \| U.S. Investment-Grade Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	62.80%
Class R5 \| U.S. Large-Cap Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	22.20%
Class R5 \| U.S. High-Yield Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	5.10%
Class R5 \| International Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	4.90%
Class R5 \| U.S. Small- and Mid-Cap Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	3.50%
Class R5 \| Commodities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	1.50%

Shareholder Report, Holdings _6

Label	Element	Value
Class R6 \| U.S. Investment-Grade Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	62.80%
Class R6 \| U.S. Large-Cap Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	22.20%
Class R6 \| U.S. High-Yield Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	5.10%
Class R6 \| International Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	4.90%
Class R6 \| U.S. Small- and Mid-Cap Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	3.50%
Class R6 \| Commodities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	1.50%

Shareholder Report, Holdings _7

Label	Element	Value
Class Y \| U.S. Investment-Grade Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	62.80%
Class Y \| U.S. Large-Cap Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	22.20%
Class Y \| U.S. High-Yield Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	5.10%
Class Y \| International Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	4.90%
Class Y \| U.S. Small- and Mid-Cap Equity Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	3.50%
Class Y \| Commodities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	1.50%