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Income Taxes - Reconciliation Between Effective Tax Rate On Income From Continuing Operations And Statutory Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Statutory federal income tax rate (percent)	21.00%	21.00%	21.00%
Income (Loss) Attributable to Parent, before Tax [Abstract]
Income tax expense at federal statutory rate	$ 915	$ 796	$ 972
State income taxes, net of federal tax benefit	145	104	134
Tax effect of foreign operations	(25)	(16)	(85)
Foreign-derived intangible income	(83)	(67)	(60)
Unrecognized tax benefits and settlements	91	116	6
Net tax benefit on intellectual property repatriation and sales	(258)	(104)	0
Canadian disposal transaction loss	140	0	0
Valuation allowance release	0	(157)	0
Share-based compensation	(42)	(37)	(58)
Other, net	(5)	(6)	(4)
Income tax expense	$ 878	$ 629	$ 905

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

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of reported income tax benefit from difference to expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to foreign-derived intangible income (FDII).

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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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