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Income Taxes - Schedule of Income From Continuing Operations And Statutory Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Income (Loss) Attributable to Parent, before Tax [Abstract]
Income tax expense at federal statutory rate	$ 1,302	$ 915	$ 796
Valuation allowance release		0	(157)
State income taxes, net of federal tax benefit	213	145	104
Tax effect of foreign operations		(25)	(16)
Foreign-derived intangible income		(83)	(67)
Unrecognized tax benefits and settlements	65	91	116
Net tax benefit on intellectual property repatriation and sales		(258)	(104)
Canadian disposal transaction loss		140	0
Share-based compensation		(42)	(37)
Other, net		(5)	(6)
Income tax expense	$ 1,102	$ 878	$ 629

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Effective Income Tax Rate Reconciliation,Intellectual Property Transfer, Net Tax Benefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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