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Financial Instruments (Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Mar. 31, 2023
Financial Instruments    
Fair Value $ 359 $ 343 [1]
Short-term investments    
Financial Instruments    
Due in 1 year or less, Amortized Cost 283 267
Due in 1 year or less, Fair Value 282 266
Due 1 year through 5 years, Amortized Cost 73 72
Due 1 year through 5 years, Fair Value 73 72
Due after 5 years, Amortized Cost 4 5
Due after 5 years, Fair Value 4 5
Amortized Cost 360 344
Fair Value $ 359 $ 343
[1] Derived from audited Consolidated Financial Statements.