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Financial Instruments (Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Mar. 31, 2022
Financial Instruments    
Short-term investments, Fair Value $ 334 $ 330 [1]
Short-term investments    
Financial Instruments    
Due in 1 year or less, Amortized Cost 262 250
Due in 1 year or less, Fair Value 260 249
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost 71 77
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 70 76
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost 4 5
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 4 5
Short-term investments, Amortized Cost 337 332
Short-term investments, Fair Value $ 334 $ 330
[1] Derived from audited Consolidated Financial Statements.