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Financial Instruments (Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Mar. 31, 2018
Financial Instruments    
Short-term investments, Fair Value $ 1,664 $ 1,073 [1]
Short-term investments    
Financial Instruments    
Due in 1 year or less, Amortized Cost 1,218 521
Due in 1 year or less, Fair Value 1,216 520
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost 451 561
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 446 553
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost 2 0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 2 0
Short-term investments, Amortized Cost 1,671 1,082
Short-term investments, Fair Value $ 1,664 $ 1,073
[1] Derived from audited Consolidated Financial Statements.