Hedging Activities - Summary of Derivative Instruments Gain (Loss) (Details) - Derivatives designated for hedge accounting - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Net Investment Hedging \| Cross-currency swaps
Derivatives, Fair Value [Line Items]
Derivatives designated as net investment hedges:	$ 3	$ 28	$ (4)
Cash Flow Hedging \| Cross-currency swaps
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow and other hedges:	39	(54)	(18)
Cash Flow Hedging \| Fixed interest rate swaps
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow and other hedges:	$ 14	$ (30)	$ 39

Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-15

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4C
-Subparagraph (c)
-SubTopic 10
-Topic 815
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C

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Balance Type:	debit
Period Type:	duration