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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, 2022	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income tax expense (benefit) at federal statutory rate	$ 405	$ (1,057)	$ 240
State income taxes, net of federal tax benefit	83	(206)	(41)
Tax effect of foreign operations	(186)	(77)	(81)
Unrecognized tax benefits and settlements	(26)	41	(7)
Opioid-related litigation and claims	38	715	0
Net tax benefit on intellectual property transfer	0	(105)	0
Tax-free gain on investment exit	0	0	(87)
Effective Income Tax Rate Reconciliation, Disposal Transaction Loss, Amount	345	0	0
Capital loss carryback	0	0	(19)
Other, net	(23)	(6)	13
Income tax expense (benefit)	$ 636	$ (695)	$ 18
Statutory federal income tax rate (percent)	21.00%	21.00%	21.00%
Research and development credit	$ 4	$ 5	$ 7

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

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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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