Income Taxes - Components Of Deferred Tax Balances (Details) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023
Assets
Receivable allowances	$ 244	$ 51
Opioid-related litigation and claims	680	699
Compensation and benefit-related accruals	277	265
Net operating loss and credit carryforwards	751	760
Lease obligations	438	427
Capitalized research and development cost	60	35
Intangibles	5	0
Other	147	127
Subtotal	2,602	2,364
Less: valuation allowance	(653)	(696)
Total assets	1,949	1,668
Liabilities
Inventory valuation and other assets	(2,092)	(2,079)
Fixed assets	(16)	(67)
Intangibles	0	(267)
Lease right-of-use assets	(431)	(412)
Other	(10)	(19)
Total liabilities	(2,549)	(2,844)
Net deferred tax liability	(600)	(1,176)
Long-term deferred tax asset	317	211
Long-term deferred tax liability	$ (917)	$ (1,387)