Restructuring, Impairment, and Related Charges, Net - Summary of Details for Charges Recorded (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	$ 10	$ 35	$ 9
Exit and other-related costs	62	102	97
Asset impairments and accelerated depreciation	43	72	139
Total	115	209	245
Operating Segments | U.S. Pharmaceutical
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	10	6	8
Exit and other-related costs	3	7	9
Asset impairments and accelerated depreciation	4	25	18
Total	17	38	35
Operating Segments | Prescription Technology Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	0	23	1
Exit and other-related costs	11	7	4
Asset impairments and accelerated depreciation	0	13	20
Total	11	43	25
Operating Segments | Medical-Surgical Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	(1)	2	(1)
Exit and other-related costs	12	3	5
Asset impairments and accelerated depreciation	0	5	5
Total	11	10	9
Operating Segments | International
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	2	4	8
Exit and other-related costs	9	21	33
Asset impairments and accelerated depreciation	10	10	35
Total	21	35	76
Corporate
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	(1)	0	(7)
Exit and other-related costs	27	64	46
Asset impairments and accelerated depreciation	29	19	61
Total	$ 55	$ 83	$ 100