Hedging Activities - Schedule of Gains (Losses) From Derivatives Included in Other Comprehensive Income (Loss) (Details) - Derivatives designated for hedge accounting - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Cross-currency swaps \| Net Investment Hedging
Derivatives, Fair Value [Line Items]
Derivatives designated as net investment hedges:	$ 98	$ (20)	$ (135)	$ (13)
Cross-currency swaps \| Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow and other hedges:	(5)	(14)	0	(14)
Interest rate swap locks, Foreign currency forwards and Other \| Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow and other hedges:	$ (2)	$ 2	$ 12	$ 2

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
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Amount, after 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
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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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