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Financial Instruments (Fair Value Of Short-Term Investments) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Mar. 31, 2023
Financial Instruments    
Fair Value $ 343 $ 343 [1]
Short-term investments    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 344 344
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1) (1)
Fair Value 343 343
Short-term investments | Corporate bonds    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 98 114
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1) (1)
Fair Value 97 113
Short-term investments | U.S. Treasury securities    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 96 80
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 96 80
Short-term investments | U.S. agency securities    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 24 25
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 24 25
Short-term investments | Commercial paper    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 63 63
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 63 63
Short-term investments | Debt Security, Government, Non-US [Member]    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 10 11
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 10 11
Short-term investments | Asset-backed Securities [Member]    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 38 37
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 38 37
Short-term investments | Certificates of Deposit [Member]    
Financial Instruments    
Debt Securities, Available-for-sale, Amortized Cost 15 14
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 15 $ 14
[1] Derived from audited Consolidated Financial Statements.