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Fair Value Measurements - Assets And Liabilities Measured At Fair Value On A Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Mar. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments $ 112 $ 112 [1]
Corporate bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 46 46
U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 21 12
Foreign government securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 7 4
Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 38 50
(Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Total assets at fair value 225 1,010
Total liabilities at fair value 45 36
(Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Total assets at fair value 104 128
Total liabilities at fair value 88 26
(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 21 12
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 2) | Corporate bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 47 46
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) | Foreign government securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 7 4
Short-term investments | (Level 2) | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Asset-backed securities 38 50
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) | 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
Cash equivalents | (Level 1) | Bank and time deposits    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Cash equivalents 32 58
Cash equivalents | (Level 1) | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Cash equivalents 128 904
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 12 28
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 44 36
Other assets | (Level 2) | Deferred compensation plan assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, deferred compensation plan 0 0
Other assets | (Level 3) | Deferred compensation plan assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, deferred compensation plan 0 0
Accounts payable, 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
Accounts payable, 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 88 26
Accounts payable, 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 45 36
Other liabilities | (Level 2) | Deferred compensation plan liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, deferred compensation plan 0 0
Other liabilities | (Level 3) | Deferred compensation plan liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, deferred compensation plan 0 0
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Total assets at fair value 329 1,138
Total liabilities at fair value 133 62
Fair Value | Short-term investments | Corporate bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 47 46
Fair Value | Short-term investments | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 21 12
Fair Value | Short-term investments | Foreign government securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Short-term investments 7 4
Fair Value | Short-term investments | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Asset-backed securities 38 50
Fair Value | Cash equivalents | Bank and time deposits    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Cash equivalents 32 58
Fair Value | Cash equivalents | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, Cash equivalents 128 904
Fair Value | Other current assets and other assets | Foreign currency derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Foreign currency derivatives 12 28
Fair Value | Other assets | Deferred compensation plan assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, deferred compensation plan 44 36
Fair Value | Accounts payable, 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 88 26
Fair Value | Other liabilities | Deferred compensation plan liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Fair value, deferred compensation plan $ 45 $ 36
[1] Derived from audited Consolidated Financial Statements.