Restructuring, Impairment, and Related Charges, Net - Summary of Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	$ (7)	$ 4	$ 5	$ 3
Exit and other-related costs	11	25	51	68
Asset impairments and accelerated depreciation	0	2	28	13
Total	4	31	84	84
Operating Segments | U.S. Pharmaceutical
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	(6)	0	3	3
Exit and other-related costs	1	1	3	2
Asset impairments and accelerated depreciation	0	1	0	4
Total	(5)	2	6	9
Operating Segments | Prescription Technology Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	1	0	1	0
Exit and other-related costs	1	1	6	4
Asset impairments and accelerated depreciation	0	0	0	11
Total	2	1	7	15
Operating Segments | Medical-Surgical Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	0	0	0	0
Exit and other-related costs	3	1	9	3
Asset impairments and accelerated depreciation	0	0	0	0
Total	3	1	9	3
Operating Segments | International
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	0	0	2	2
Exit and other-related costs	0	7	9	15
Asset impairments and accelerated depreciation	0	1	1	2
Total	0	8	12	19
Corporate
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	(2)	4	(1)	(2)
Exit and other-related costs	6	15	24	44
Asset impairments and accelerated depreciation	0	0	27	(4)
Total	$ 4	$ 19	$ 50	$ 38