Restructuring, Impairment, and Related Charges, Net - Summary of Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	$ (3)	$ (1)	$ (1)	$ 13
Exit and other-related costs	22	10	43	50
Asset impairments and accelerated depreciation	11	23	11	127
Total	30	32	53	190
Operating Segments | U.S. Pharmaceutical
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	0	0	3	2
Exit and other-related costs	0	2	1	4
Asset impairments and accelerated depreciation	3	8	3	16
Total	3	10	7	22
Operating Segments | Prescription Technology Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	0	(1)	0	(1)
Exit and other-related costs	1	1	3	2
Asset impairments and accelerated depreciation	6	0	11	17
Total	7	0	14	18
Operating Segments | Medical-Surgical Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	0	1	0	1
Exit and other-related costs	1	0	2	2
Asset impairments and accelerated depreciation	0	1	0	5
Total	1	2	2	8
Operating Segments | International
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	2	(2)	2	10
Exit and other-related costs	6	1	8	15
Asset impairments and accelerated depreciation	1	2	1	36
Total	9	1	11	61
Corporate
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	(5)	1	(6)	1
Exit and other-related costs	14	6	29	27
Asset impairments and accelerated depreciation	1	12	(4)	53
Total	$ 10	$ 19	$ 19	$ 81