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Financial Instruments - Fair Value Of Short-Term Investments By Stated Maturity Date Schedule (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Mar. 31, 2025
Financial Instruments [Abstract]    
Due in 1 year or less, Amortized Cost $ 33 $ 46
Due in 1 year or less, Fair Value 33 46
Due 1 year through 5 years, Amortized Cost 77 63
Due 1 year through 5 years, Fair Value 77 63
Due after 5 years, Amortized Cost 2 3
Due after 5 years, Fair Value 2 3
Amortized Cost 112 112
Fair Value $ 112 $ 112 [1]
[1] Derived from audited Consolidated Financial Statements.