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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