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Financial Instruments (Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Mar. 31, 2020
Financial Instruments    
Short-term investments, Fair Value $ 1,938 $ 1,967 [1]
Short-term investments    
Financial Instruments    
Due in 1 year or less, Amortized Cost 1,579 1,568
Due in 1 year or less, Fair Value 1,580 1,567
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost 348 395
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 350 393
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost 8 7
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 8 7
Short-term investments, Amortized Cost 1,935 1,970
Short-term investments, Fair Value $ 1,938 $ 1,967
[1] Derived from audited Consolidated Financial Statements.