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Financial Instruments (Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Mar. 31, 2021
Financial Instruments    
Short-term investments, Fair Value $ 342 $ 1,106 [1]
Short-term investments    
Financial Instruments    
Due in 1 year or less, Amortized Cost 242 895
Due in 1 year or less, Fair Value 242 896
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost 94 203
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 94 203
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost 6 7
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 6 7
Short-term investments, Amortized Cost 342 1,105
Short-term investments, Fair Value $ 342 $ 1,106
[1] Derived from audited Consolidated Financial Statements.