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(Fair Value Of Short-Term Investments) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Mar. 31, 2022
Financial Instruments [Line Items]    
Short-term investments, Fair Value $ 343 $ 330
Short-Term Investments [Member]    
Financial Instruments [Line Items]    
Short-term investments, Amortized Cost 344 332
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1) (2)
Short-term investments, Fair Value 343 330
Short-Term Investments [Member] | Corporate bonds    
Financial Instruments [Line Items]    
Short-term investments, Amortized Cost 114 117
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1) (1)
Short-term investments, Fair Value 113 116
Short-Term Investments [Member] | U.S. Treasury securities    
Financial Instruments [Line Items]    
Short-term investments, Amortized Cost 80 103
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 (1)
Short-term investments, Fair Value 80 102
Short-Term Investments [Member] | U.S. Agency Securities [Member]    
Financial Instruments [Line Items]    
Short-term investments, Amortized Cost 25 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Short-term investments, Fair Value 25 0
Short-Term Investments [Member] | Commercial paper    
Financial Instruments [Line Items]    
Short-term investments, Amortized Cost 63 39
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Short-term investments, Fair Value 63 39
Short-Term Investments [Member] | Foreign government securities    
Financial Instruments [Line Items]    
Short-term investments, Amortized Cost 11 17
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Short-term investments, Fair Value 11 17
Short-Term Investments [Member] | Asset-backed securities    
Financial Instruments [Line Items]    
Short-term investments, Amortized Cost 37 38
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Short-term investments, Fair Value 37 38
Short-Term Investments [Member] | Certificates of deposit    
Financial Instruments [Line Items]    
Short-term investments, Amortized Cost 14 18
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Short-term investments, Fair Value $ 14 $ 18