FAIR VALUE MEASUREMENTS - Carrying Amounts and Fair Values of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Sep. 30, 2022 |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Cash and cash equivalents | | $ 3,288 | $ 3,001 |
Short-term borrowings—trade receivable securitization facility | | 350 | 350 |
Long-term Debt | | 19,453 | 19,445 |
Other Noncurrent Assets | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Interest Rate Swap Assets | [1] | 61 | 68 |
Interest Rate Cap Agreements | [1] | 51 | 50 |
Accrued Liabilities | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Foreign Currency Contract, Liability | [2] | 2 | 11 |
Other Current Assets | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Interest Rate Swap Assets | [3] | 90 | 77 |
Term loans | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term Debt | [4] | 7,212 | 7,256 |
Government refundable advances | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term Debt | | 23 | 23 |
Finance Lease Obligations | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term Debt | | 193 | 146 |
Level 1 | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Cash and cash equivalents, Fair Value | | 3,288 | 3,001 |
Level 2 | Other Noncurrent Assets | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Interest Rate Cap Agreements | [1] | 51 | 50 |
Level 2 | Accrued Liabilities | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Foreign Currency Contract, Liability | [2] | 2 | 11 |
Level 2 | Term loans | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term debt, including current portion, Fair Value | [4] | 7,226 | 6,976 |
Level 2 | Government refundable advances | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term debt, including current portion, Fair Value | | 23 | 23 |
Level 2 | Finance Lease Obligations | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term debt, including current portion, Fair Value | | 193 | 146 |
Senior Secured Notes $1.1B due 2025 8% | Secured Debt | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term Debt | [4] | 1,095 | 1,094 |
Senior Secured Notes $1.1B due 2025 8% | Level 1 | Secured Debt | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term debt, including current portion, Fair Value | [4] | 1,121 | 1,115 |
Senior Subordinated Notes Due 2026 6.375% | Senior Subordinated Notes | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term Debt | [4] | 946 | 946 |
Senior Subordinated Notes Due 2026 6.375% | Level 1 | Senior Subordinated Notes | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term debt, including current portion, Fair Value | [4] | 929 | 884 |
Senior subordinated notes due 2026 6.875% | Senior Subordinated Notes | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term Debt | [4] | 495 | 495 |
Senior subordinated notes due 2026 6.875% | Level 1 | Senior Subordinated Notes | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term debt, including current portion, Fair Value | [4] | 486 | 473 |
Senior Secured Notes $4.4B Due 2026 6.25% | Secured Debt | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term Debt | [4] | 4,370 | 4,368 |
Senior Secured Notes $4.4B Due 2026 6.25% | Level 1 | Secured Debt | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term debt, including current portion, Fair Value | [4] | 4,334 | 4,257 |
Senior Subordinated Notes $550M Due 2027 7.50% | Senior Subordinated Notes | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term Debt | [4] | 547 | 547 |
Senior Subordinated Notes $550M Due 2027 7.50% | Level 1 | Senior Subordinated Notes | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term debt, including current portion, Fair Value | [4] | 547 | 524 |
Senior Subordinated Notes $2650M Due 2027 5.50% | Senior Subordinated Notes | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term Debt | [4] | 2,636 | 2,635 |
Senior Subordinated Notes $2650M Due 2027 5.50% | Level 1 | Senior Subordinated Notes | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term debt, including current portion, Fair Value | [4] | 2,491 | 2,286 |
Senior Subordinated Notes $1200M Due 2029 4.625% | Senior Subordinated Notes | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term Debt | [4] | 1,192 | 1,191 |
Senior Subordinated Notes $1200M Due 2029 4.625% | Level 1 | Senior Subordinated Notes | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term debt, including current portion, Fair Value | [4] | 1,059 | 966 |
Senior Subordinated Notes $750M due 2029 4.875% | Senior Subordinated Notes | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term Debt | [4] | 744 | 744 |
Senior Subordinated Notes $750M due 2029 4.875% | Level 1 | Senior Subordinated Notes | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Long-term debt, including current portion, Fair Value | [4] | 664 | 606 |
Asset-backed Securities | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Short-term borrowings—trade receivable securitization facility | [4] | 350 | 350 |
Asset-backed Securities | Level 2 | | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | | |
Short-term borrowings - trade receivable securitization facility, Fair Value | [4] | $ 350 | $ 350 |
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[1]Included in other non-current assets on the condensed consolidated balance sheets.[2]Included in accrued and other current liabilities on the condensed consolidated balance sheets.[3]Included in prepaid expenses and other on the condensed consolidated balance sheets.[4]The carrying amount of the debt instrument is presented net of debt issuance costs, premium and discount. Refer to Note 9, “Debt,” for gross carrying amounts. | |