Restructuring, Impairment, and Related Charges, Net - Schedule of Activity Related to the Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Restructuring Reserve [Roll Forward]
Beginning balance			$ 126
Restructuring, impairment, and related charges, net	$ 63	$ 234	110	$ 244
Non-cash charges			(4)
Cash payments			(162)
Ending balance	70		70
Total reserve balance	70		70
Operating Segments | North American Pharmaceutical
Restructuring Reserve [Roll Forward]
Beginning balance			11
Restructuring, impairment, and related charges, net	6	63	7	65
Non-cash charges			(1)
Cash payments			(3)
Ending balance	14		14
Total reserve balance	14		14
Operating Segments | Prescription Technology Solutions
Restructuring Reserve [Roll Forward]
Beginning balance			1
Restructuring, impairment, and related charges, net	0	1	0	5
Non-cash charges			0
Cash payments			(1)
Ending balance	0		0
Total reserve balance	0		0
Operating Segments | Medical-Surgical Solutions
Restructuring Reserve [Roll Forward]
Beginning balance			90
Restructuring, impairment, and related charges, net	19	147	36	150
Non-cash charges			0
Cash payments			(87)
Ending balance	39		39
Total reserve balance	39		39
Corporate
Restructuring Reserve [Roll Forward]
Beginning balance			24
Restructuring, impairment, and related charges, net	38	$ 23	67	$ 24
Non-cash charges			(3)
Cash payments			(71)
Ending balance	17		17
Total reserve balance	17		17
Accrued Liabilities
Restructuring Reserve [Roll Forward]
Beginning balance			103
Ending balance	52		52
Total reserve balance	52		52
Other Non-Current Liabilities
Restructuring Reserve [Roll Forward]
Beginning balance			23
Ending balance	18		18
Total reserve balance	$ 18		$ 18