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Financial Instruments (Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Mar. 31, 2018
Financial Instruments    
Short-term investments, Fair Value $ 1,095 $ 1,073 [1]
Short-term investments    
Financial Instruments    
Due in 1 year or less, Amortized Cost 587 521
Due in 1 year or less, Fair Value 585 520
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost 516 561
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 510 553
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost 0 0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 0 0
Short-term investments, Amortized Cost 1,103 1,082
Short-term investments, Fair Value $ 1,095 $ 1,073
[1] Derived from audited Consolidated Financial Statements.