Restructuring, Impairment, and Related Charges - Summary of Details for Charges Recorded (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	$ 9	$ 104	$ 47
Exit and other-related costs	97	59	79
Asset impairments and accelerated depreciation (2)	139	56	30
Total	245	219	156
Operating Segments | U.S. Pharmaceutical
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	8	10	12
Exit and other-related costs	9	11	1
Asset impairments and accelerated depreciation (2)	18	0	10
Total	35	21	23
Operating Segments | Prescription Technology Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	1	4	(1)
Exit and other-related costs	4	0	0
Asset impairments and accelerated depreciation (2)	20	0	0
Total	25	4	(1)
Operating Segments | Medical-Surgical Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	(1)	(1)	4
Exit and other-related costs	5	4	19
Asset impairments and accelerated depreciation (2)	5	1	1
Total	9	4	24
Operating Segments | International
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	8	22	2
Exit and other-related costs	33	17	13
Asset impairments and accelerated depreciation (2)	35	46	6
Total	76	85	21
Corporate
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	(7)	69	30
Exit and other-related costs	46	27	46
Asset impairments and accelerated depreciation (2)	61	9	13
Total	$ 100	$ 105	$ 89