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Restructuring, Impairment, and Related Charges - Summary of Restructuring Activity (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Restructuring Reserve [Roll Forward]
Beginning balance	$ 151
Restructuring, impairment, and related charges	158	$ 56
Non-cash charges	(104)
Cash payments	(21)
Other	(7)
Ending balance	177
International
Restructuring Reserve [Roll Forward]
Restructuring, impairment, and related charges	6	14
Operating Segments | U.S. Pharmaceutical
Restructuring Reserve [Roll Forward]
Beginning balance	19
Restructuring, impairment, and related charges	12	2
Non-cash charges	(8)
Cash payments	(5)
Other	0
Ending balance	18
Operating Segments | Prescription Technology Solutions
Restructuring Reserve [Roll Forward]
Beginning balance	4
Restructuring, impairment, and related charges	18	0
Non-cash charges	(17)
Cash payments	(1)
Other	0
Ending balance	4
Operating Segments | Medical-Surgical Solutions
Restructuring Reserve [Roll Forward]
Beginning balance	3
Restructuring, impairment, and related charges	6	3
Non-cash charges	(4)
Cash payments	(2)
Other	(1)
Ending balance	2
Operating Segments | International
Restructuring Reserve [Roll Forward]
Beginning balance	66
Restructuring, impairment, and related charges	60	23
Non-cash charges	(34)
Cash payments	(5)
Other	(3)
Ending balance	84
Corporate
Restructuring Reserve [Roll Forward]
Beginning balance	59
Restructuring, impairment, and related charges	62	$ 28
Non-cash charges	(41)
Cash payments	(8)
Other	(3)
Ending balance	69
Other accrued liabilities
Restructuring Reserve [Roll Forward]
Beginning balance	99
Ending balance	127
Other noncurrent liabilities
Restructuring Reserve [Roll Forward]
Beginning balance	52
Ending balance	$ 50

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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