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Debt and Financing Activities - Commercial Paper (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Debt Instrument [Line Items]
Commercial paper issuances	$ 9,200	$ 15,100	$ 20,000
Commercial paper repaid	9,200	15,100	$ 20,000
Commercial paper notes outstanding	6,526	5,654
Commercial Paper
Debt Instrument [Line Items]
Credit facility borrowing capacity	5,000
Commercial paper notes outstanding	$ 0	$ 0

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