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(Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Mar. 31, 2022
Financial Instruments [Line Items]    
Short-term investments $ 343 $ 330
Short-Term Investments [Member]    
Financial Instruments [Line Items]    
Due in 1 year or less, Amortized Cost 267 250
Due in 1 year or less, Fair Value 266 249
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost 72 77
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 72 76
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost 5 5
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 5 5
Debt Securities, Available-for-Sale, Amortized Cost 344 332
Short-term investments $ 343 $ 330