Investments in Marketable Securities - Summary of Contractual Maturities of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions		Dec. 31, 2022	Mar. 31, 2022
Available-for-sale debt securities, Amortized cost
Due within 1 Year, Amortized cost		$ 58
Due after 1 Year through 5 Years, Amortized cost		286
Due after 5 Years through 10 Years, Amortized cost		458
Due after 10 Years, Amortized cost		390
Mortgage-backed and asset-backed securities, Amortized cost	[1]	219
Available-for-sale debt securities, Amortized cost		$ 1,411	$ 1,372
Debt Securities, Available-for-sale, Maturity Allocation [Extensible List]		us-gaap:DebtSecuritiesMaturityAllocationContractualMaturityMember
Available-for-sale debt securities, Fair value
Due within 1 Year, Fair value		$ 57
Due after 1 Year through 5 Years, Fair value		267
Due after 5 Years through 10 Years, Fair value		418
Due after 10 Years, Fair value		303
Mortgage-backed and asset-backed securities, Fair value	[1]	198
Total, Fair value		$ 1,243	$ 1,304
Debt Securities, Available-for-sale, Maturity Allocation [Extensible List]		us-gaap:DebtSecuritiesMaturityAllocationContractualMaturityMember

[1] Mortgage-backed and asset-backed securities are shown separately from other maturity groupings as these securities have multiple maturity dates.