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Hedging Activities - Summary of Foreign Currency Gains and (Losses) from Non-Derivative Instruments (Details) - Derivatives designated for hedge accounting: - Net Investment Hedges - Euro Denominated Notes - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Derivatives, Fair Value [Line Items]
Derivatives designated as net investment hedges:	$ 7	$ 73	$ (118)
Reclassification from AOCI, current period, before tax	$ 112

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Amount, before tax, of reclassification from accumulated other comprehensive income (AOCI) for gain (loss) from derivative designated and qualifying as net investment hedge.

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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