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Financial Instruments (Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Mar. 31, 2019
Financial Instruments    
Short-term investments, Fair Value $ 1,654 $ 737 [1]
Short-term investments    
Financial Instruments    
Due in 1 year or less, Amortized Cost 1,273 449
Due in 1 year or less, Fair Value 1,273 448
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost 367 287
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 369 287
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost 12 2
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 12 2
Short-term investments, Amortized Cost 1,652 738
Short-term investments, Fair Value $ 1,654 $ 737
[1] Derived from audited Consolidated Financial Statements.