Restructuring, Impairment, and Related Charges, Net - Schedule of Restructuring, Impairment, and Related Charges, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	$ 9	$ 149	$ 13	$ 148
Exit and other-related costs	52	12	93	20
Asset impairments and accelerated depreciation	2	73	4	76
Total	63	234	110	244
Restructuring, impairment, and related charges, net	63	171	110	181
Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring, impairment, and related charges, net		63		63
Operating Segments | North American Pharmaceutical
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	4	1	4	1
Exit and other-related costs	1	(1)	2	(1)
Asset impairments and accelerated depreciation	1	63	1	65
Total	6	63	7	65
Operating Segments | Prescription Technology Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	0	0	0	0
Exit and other-related costs	0	0	0	3
Asset impairments and accelerated depreciation	0	1	0	2
Total	0	1	0	5
Operating Segments | Medical-Surgical Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	5	144	10	144
Exit and other-related costs	14	3	26	6
Asset impairments and accelerated depreciation	0	0	0	0
Total	19	147	36	150
Corporate
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	0	4	(1)	3
Exit and other-related costs	37	10	65	12
Asset impairments and accelerated depreciation	1	9	3	9
Total	$ 38	$ 23	$ 67	$ 24