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Financial Instruments (Fair Value Of Short-Term Investments) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Mar. 31, 2022
Financial Instruments    
Fair Value $ 335 $ 330 [1]
Short-term investments    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 338 332
Gross Unrealized Gains 0 0
Gross Unrealized Losses (3) (2)
Fair Value 335 330
Short-term investments | Corporate bonds    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 129 117
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1) (1)
Fair Value 128 116
Short-term investments | U.S. Treasury securities    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 89 103
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1) (1)
Fair Value 88 102
Short-term investments | U.S. agency securities    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 4 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 4 0
Short-term investments | Commercial paper    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 43 39
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 43 39
Short-term investments | Debt Security, Government, Non-US [Member]    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 17 17
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 17 17
Short-term investments | Asset-backed Securities [Member]    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 38 38
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1) 0
Fair Value 37 38
Short-term investments | Certificates of Deposit [Member]    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 18 18
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 18 $ 18
[1] Derived from audited Consolidated Financial Statements.