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Debt and Financing Activities - Commercial Paper (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023	May 08, 2025
Debt Instrument [Line Items]
Commercial paper issuances	$ 15,100	$ 20,000	$ 8,500
Commercial paper repaid	15,100	20,000	$ 8,500
Total debt	5,654	5,629
Commercial Paper
Debt Instrument [Line Items]
Credit facility borrowing capacity (up to)	4,000
Total debt	$ 0	$ 0
Commercial Paper | Subsequent Event
Debt Instrument [Line Items]
Credit facility borrowing capacity (up to)				$ 5,000

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