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Income Taxes - Schedule of Components Of Deferred Tax Balances (Details) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025
Assets
Receivable allowances	$ 69	$ 136
Opioid-related litigation and claims	623	680
Compensation and benefit-related accruals	333	287
Loss and credit carryforwards	996	847
Lease obligations	429	423
Other	194	236
Subtotal	2,644	2,609
Less: valuation allowance	(769)	(644)
Total assets	1,875	1,965
Liabilities
Inventory valuation and other assets	(2,008)	(2,139)
Fixed assets	(303)	(4)
Lease right-of-use assets	(432)	(434)
Other	(30)	(50)
Total liabilities	(2,773)	(2,627)
Net deferred tax liability	(898)	(662)
Long-term deferred tax asset	432	367
Long-term deferred tax liability	$ (1,330)	$ (1,029)

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