Restructuring, Impairment and Related Charges - Summary of Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	$ 38	$ 4
Exit and other-related costs	13	14
Asset impairments and accelerated depreciation	5	5
Total	56	23
Operating Segments | U.S. Pharmaceutical and Specialty Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	1	(1)
Exit and other-related costs	1	0
Asset impairments and accelerated depreciation	0	0
Total	2	(1)
Operating Segments | European Pharmaceutical Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	13	(1)
Exit and other-related costs	1	1
Asset impairments and accelerated depreciation	4	3
Total	18	3
Operating Segments | Medical-Surgical Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	0	0
Exit and other-related costs	3	2
Asset impairments and accelerated depreciation	0	1
Total	3	3
Operating Segments | Other
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	4	0
Exit and other-related costs	1	1
Asset impairments and accelerated depreciation	0	0
Total	5	1
Corporate
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	20	6
Exit and other-related costs	7	10
Asset impairments and accelerated depreciation	1	1
Total	$ 28	$ 17