Derivatives - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - Level 3 - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	$ 0	$ 0
Cash Flow Hedging \| Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	21	4
Derivative Liabilities	$ 0	$ 4

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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+ Details

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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