Fair Value Measurements (Fair Value of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Mar. 31, 2023 |
Fair Value | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total assets at fair value | $ 1,525 | $ 1,413 |
Total liabilities at fair value | 51 | 89 |
Short-term investments | 362 | 343 |
Corporate bonds | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 130 | 113 |
U.S. Treasury securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 95 | 80 |
U.S. agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 9 | 25 |
Commercial paper | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 66 | 63 |
Foreign government securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 8 | 11 |
Asset-backed securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 41 | 37 |
Certificates of deposit | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 13 | 14 |
Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total assets at fair value | 1,221 | 1,115 |
Total liabilities at fair value | 31 | 24 |
Significant Other Observable Inputs (Level 2) | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total assets at fair value | 304 | 298 |
Total liabilities at fair value | 20 | 65 |
Fair Value, Inputs, Level 3 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total assets at fair value | 0 | 0 |
Total liabilities at fair value | 0 | 0 |
Cash equivalents | Bank and time deposits | Fair Value | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, cash equivalents | 58 | 56 |
Cash equivalents | Money market funds | Fair Value | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, cash equivalents | 1,038 | 956 |
Cash equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Bank and time deposits | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, cash equivalents | 58 | 56 |
Cash equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Money market funds | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, cash equivalents | 1,038 | 956 |
Cash equivalents | Significant Other Observable Inputs (Level 2) | Bank and time deposits | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, cash equivalents | 0 | 0 |
Cash equivalents | Significant Other Observable Inputs (Level 2) | Money market funds | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, cash equivalents | 0 | 0 |
Cash equivalents | Fair Value, Inputs, Level 3 | Bank and time deposits | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, cash equivalents | 0 | 0 |
Cash equivalents | Fair Value, Inputs, Level 3 | Money market funds | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, cash equivalents | 0 | 0 |
Short-term investments | Corporate bonds | Fair Value | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 130 | 113 |
Short-term investments | U.S. Treasury securities | Fair Value | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 95 | 80 |
Short-term investments | U.S. agency securities | Fair Value | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 9 | |
Short-term investments | Foreign government securities | Fair Value | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 8 | 11 |
Short-term investments | Asset-backed securities | Fair Value | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Asset-backed securities | 41 | 37 |
Short-term investments | Certificates of deposit | Fair Value | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 13 | 14 |
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Corporate bonds | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | 0 |
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | U.S. Treasury securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 95 | 80 |
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | U.S. agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | |
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Foreign government securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | 0 |
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Asset-backed securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Asset-backed securities | 0 | 0 |
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Certificates of deposit | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | 0 |
Short-term investments | Significant Other Observable Inputs (Level 2) | Corporate bonds | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 130 | 113 |
Short-term investments | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | 0 |
Short-term investments | Significant Other Observable Inputs (Level 2) | U.S. agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 9 | |
Short-term investments | Significant Other Observable Inputs (Level 2) | Foreign government securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 8 | 11 |
Short-term investments | Significant Other Observable Inputs (Level 2) | Asset-backed securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Asset-backed securities | 41 | 37 |
Short-term investments | Significant Other Observable Inputs (Level 2) | Certificates of deposit | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 13 | 14 |
Short-term investments | Fair Value, Inputs, Level 3 | Corporate bonds | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | 0 |
Short-term investments | Fair Value, Inputs, Level 3 | U.S. Treasury securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | 0 |
Short-term investments | Fair Value, Inputs, Level 3 | U.S. agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | |
Short-term investments | Fair Value, Inputs, Level 3 | Foreign government securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | 0 |
Short-term investments | Fair Value, Inputs, Level 3 | Asset-backed securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Asset-backed securities | 0 | 0 |
Short-term investments | Fair Value, Inputs, Level 3 | Certificates of deposit | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | 0 |
Short-term investments and cash equivalents | U.S. agency securities | Fair Value | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | | 28 |
Short-term investments and cash equivalents | Commercial paper | Fair Value | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 74 | 66 |
Short-term investments and cash equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | U.S. agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | | 0 |
Short-term investments and cash equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Commercial paper | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | 0 |
Short-term investments and cash equivalents | Significant Other Observable Inputs (Level 2) | U.S. agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | | 28 |
Short-term investments and cash equivalents | Significant Other Observable Inputs (Level 2) | Commercial paper | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 74 | 66 |
Short-term investments and cash equivalents | Fair Value, Inputs, Level 3 | U.S. agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | | 0 |
Short-term investments and cash equivalents | Fair Value, Inputs, Level 3 | Commercial paper | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | 0 |
Other current assets and other assets | Foreign currency derivatives | Fair Value | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, foreign currency derivatives | 29 | 29 |
Other current assets and other assets | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Foreign currency derivatives | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, foreign currency derivatives | 0 | 0 |
Other current assets and other assets | Significant Other Observable Inputs (Level 2) | Foreign currency derivatives | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, foreign currency derivatives | 29 | 29 |
Other current assets and other assets | Fair Value, Inputs, Level 3 | Foreign currency derivatives | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, foreign currency derivatives | 0 | 0 |
Other assets | Deferred compensation plan assets | Fair Value | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, deferred compensation plan assets and liabilities | 30 | 23 |
Other assets | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Deferred compensation plan assets | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, deferred compensation plan assets and liabilities | 30 | 23 |
Other assets | Significant Other Observable Inputs (Level 2) | Deferred compensation plan assets | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, deferred compensation plan assets and liabilities | 0 | 0 |
Other assets | Fair Value, Inputs, Level 3 | Deferred compensation plan assets | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, deferred compensation plan assets and liabilities | 0 | 0 |
Accrued and other current liabilities and other liabilities | Foreign currency derivatives | Fair Value | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, foreign currency derivatives, liabilities | 20 | 65 |
Accrued and other current liabilities and other liabilities | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, foreign currency derivatives, liabilities | | 0 |
Accrued and other current liabilities and other liabilities | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Foreign currency derivatives | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, foreign currency derivatives, liabilities | 0 | |
Accrued and other current liabilities and other liabilities | Significant Other Observable Inputs (Level 2) | Foreign currency derivatives | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, foreign currency derivatives, liabilities | 20 | 65 |
Accrued and other current liabilities and other liabilities | Fair Value, Inputs, Level 3 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, foreign currency derivatives, liabilities | | 0 |
Accrued and other current liabilities and other liabilities | Fair Value, Inputs, Level 3 | Foreign currency derivatives | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, foreign currency derivatives, liabilities | 0 | |
Other liabilities | Deferred compensation plan liabilities | Fair Value | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, deferred compensation plan assets and liabilities | 31 | 24 |
Other liabilities | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Deferred compensation plan liabilities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, deferred compensation plan assets and liabilities | 31 | 24 |
Other liabilities | Significant Other Observable Inputs (Level 2) | Deferred compensation plan liabilities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, deferred compensation plan assets and liabilities | 0 | 0 |
Other liabilities | Fair Value, Inputs, Level 3 | Deferred compensation plan liabilities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Fair value, deferred compensation plan assets and liabilities | $ 0 | $ 0 |