Restructuring, Impairment, and Related Charges, Net - Summary of Details for Charges Recorded (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	$ 35	$ 9	$ 104
Exit and other-related costs	102	97	59
Asset impairments and accelerated depreciation	72	139	56
Total	209	245	219
Operating Segments | U.S. Pharmaceutical
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	6	8	10
Exit and other-related costs	7	9	11
Asset impairments and accelerated depreciation	25	18	0
Total	38	35	21
Operating Segments | Prescription Technology Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	23	1	4
Exit and other-related costs	7	4	0
Asset impairments and accelerated depreciation	13	20	0
Total	43	25	4
Operating Segments | Medical-Surgical Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	2	(1)	(1)
Exit and other-related costs	3	5	4
Asset impairments and accelerated depreciation	5	5	1
Total	10	9	4
Operating Segments | International
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	4	8	22
Exit and other-related costs	21	33	17
Asset impairments and accelerated depreciation	10	35	46
Total	35	76	85
Corporate
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	0	(7)	69
Exit and other-related costs	64	46	27
Asset impairments and accelerated depreciation	19	61	9
Total	$ 83	$ 100	$ 105