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Debt and Financing Activities - Commercial Paper (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Mar. 31, 2026
Line of Credit Facility [Line Items]
Proceeds from issuance of commercial paper	$ 0	$ 0
Debt outstanding	9,729		$ 6,526
Commercial Paper
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity	5,000
Debt outstanding	$ 0		$ 0

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