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(Fair Value Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Mar. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments $ 359 $ 343 [1]
(Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Total assets at fair value 791 1,115
Total liabilities at fair value 29 24
(Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Total assets at fair value 339 298
Total liabilities at fair value 21 65
(Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Total assets at fair value 0 0
Total liabilities at fair value 0 0
Short-term investments | (Level 1) | Corporate bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 0 0
Short-term investments | (Level 1) | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 105 80
Short-term investments | (Level 1) | U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 0  
Short-term investments | (Level 1) | Foreign government securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 0 0
Short-term investments | (Level 1) | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Asset-backed securities 0 0
Short-term investments | (Level 1) | Certificates of deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 0 0
Short-term investments | (Level 2) | Corporate bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 94 113
Short-term investments | (Level 2) | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 0 0
Short-term investments | (Level 2) | U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 19  
Short-term investments | (Level 2) | Foreign government securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 7 11
Short-term investments | (Level 2) | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Asset-backed securities 41 37
Short-term investments | (Level 2) | Certificates of deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 18 14
Short-term investments | (Level 3) | Corporate bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 0 0
Short-term investments | (Level 3) | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 0 0
Short-term investments | (Level 3) | U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 0  
Short-term investments | (Level 3) | Foreign government securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 0 0
Short-term investments | (Level 3) | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Asset-backed securities 0 0
Short-term investments | (Level 3) | Certificates of deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 0 0
Short-term investments and cash equivalents | (Level 1) | U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments   0
Short-term investments and cash equivalents | (Level 1) | Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 0 0
Short-term investments and cash equivalents | (Level 2) | U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments   28
Short-term investments and cash equivalents | (Level 2) | Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 78 66
Short-term investments and cash equivalents | (Level 3) | U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments   0
Short-term investments and cash equivalents | (Level 3) | Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 0 0
Cash equivalents | (Level 1) | Bank and time deposits    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Cash equivalents 57 56
Cash equivalents | (Level 1) | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Cash equivalents 601 956
Cash equivalents | (Level 2) | Bank and time deposits    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Cash equivalents 0 0
Cash equivalents | (Level 2) | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Cash equivalents 0 0
Cash equivalents | (Level 3) | Bank and time deposits    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Cash equivalents 0 0
Cash equivalents | (Level 3) | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Cash equivalents 0 0
Other current assets and other assets | (Level 1) | Foreign currency derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Foreign currency derivatives 0 0
Other current assets and other assets | (Level 2) | Foreign currency derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Foreign currency derivatives 82 29
Other current assets and other assets | (Level 3) | Foreign currency derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Foreign currency derivatives 0 0
Other assets | (Level 1) | Deferred compensation plan assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Deferred compensation plan assets 28 23
Other assets | (Level 2) | Deferred compensation plan assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Deferred compensation plan assets 0 0
Other assets | (Level 3) | Deferred compensation plan assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Deferred compensation plan assets 0 0
Accrued and other current liabilities and other liabilities | (Level 1) | Foreign currency derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Foreign currency derivatives, liabilities 0 0
Accrued and other current liabilities and other liabilities | (Level 2) | Foreign currency derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Foreign currency derivatives, liabilities 21 65
Accrued and other current liabilities and other liabilities | (Level 3) | Foreign currency derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Foreign currency derivatives, liabilities 0 0
Other liabilities | (Level 1) | Deferred Compensation Plan Liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Deferred compensation plan assets 29 24
Other liabilities | (Level 2) | Deferred Compensation Plan Liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Deferred compensation plan assets 0 0
Other liabilities | (Level 3) | Deferred Compensation Plan Liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Deferred compensation plan assets 0 0
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Total assets at fair value 1,130 1,413
Total liabilities at fair value 50 89
Fair Value | Short-term investments | Corporate bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 94 113
Fair Value | Short-term investments | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 105 80
Fair Value | Short-term investments | U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 19  
Fair Value | Short-term investments | Foreign government securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 7 11
Fair Value | Short-term investments | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Asset-backed securities 41 37
Fair Value | Short-term investments | Certificates of deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 18 14
Fair Value | Short-term investments and cash equivalents | U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments   28
Fair Value | Short-term investments and cash equivalents | Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 78 66
Fair Value | Cash equivalents | Bank and time deposits    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Cash equivalents 57 56
Fair Value | Cash equivalents | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Cash equivalents 601 956
Fair Value | Other current assets and other assets | Foreign currency derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Foreign currency derivatives 82 29
Fair Value | Other assets | Deferred compensation plan assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Deferred compensation plan assets 28 23
Fair Value | Accrued and other current liabilities and other liabilities | Foreign currency derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Foreign currency derivatives, liabilities 21 65
Fair Value | Other liabilities | Deferred Compensation Plan Liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Deferred compensation plan assets $ 29 $ 24
[1] Derived from audited Consolidated Financial Statements.