Restructuring, Impairment and Related Charges - Summary of Restructuring Activity (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Restructuring Reserve [Roll Forward]
Beginning balance	$ 157
Restructuring, impairment and related charges	56	$ 23
Non-cash charges	(5)
Cash Payments	(31)
Other	(9)
Ending balance	168
Operating Segments | U.S. Pharmaceutical and Specialty Solutions
Restructuring Reserve [Roll Forward]
Beginning balance	24
Restructuring, impairment and related charges	2	(1)
Non-cash charges	0
Cash Payments	(7)
Other	0
Ending balance	19
Operating Segments | European Pharmaceutical Solutions
Restructuring Reserve [Roll Forward]
Beginning balance	56
Restructuring, impairment and related charges	18	3
Non-cash charges	(4)
Cash Payments	(3)
Other	(2)
Ending balance	65
Operating Segments | Medical-Surgical Solutions
Restructuring Reserve [Roll Forward]
Beginning balance	20
Restructuring, impairment and related charges	3	3
Non-cash charges	0
Cash Payments	0
Other	(4)
Ending balance	19
Operating Segments | Other
Restructuring Reserve [Roll Forward]
Beginning balance	18
Restructuring, impairment and related charges	5	1
Non-cash charges	0
Cash Payments	(5)
Other	0
Ending balance	18
Corporate
Restructuring Reserve [Roll Forward]
Beginning balance	39
Restructuring, impairment and related charges	28	$ 17
Non-cash charges	(1)
Cash Payments	(16)
Other	(3)
Ending balance	47
Other accrued liabilities
Restructuring Reserve [Roll Forward]
Beginning balance	118
Ending balance	141
Other noncurrent liabilities
Restructuring Reserve [Roll Forward]
Beginning balance	39
Ending balance	$ 27