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Financial Instruments - Fair Value Of Short-Term Investments By Stated Maturity Date Schedule (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Financial Instruments [Abstract]    
Due in 1 year or less, Amortized Cost $ 46 $ 231
Due in 1 year or less, Fair Value 46 231
Due 1 year through 5 years, Amortized Cost 63 126
Due 1 year through 5 years, Fair Value 63 126
Due after 5 years, Amortized Cost 3 5
Due after 5 years, Fair Value 3 5
Short-term investments, Amortized Cost 112 362
Short-term investments, Fair Value $ 112 $ 362