Restructuring, Impairment, and Related Charges, Net - Schedule of Details for Charges Recorded (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	$ 4	$ (1)
Exit and other-related costs	41	8
Asset impairments and accelerated depreciation	2	3
Total	47	10
Operating Segments | U.S. Pharmaceutical
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	0	0
Exit and other-related costs	1	0
Asset impairments and accelerated depreciation	0	1
Total	1	1
Operating Segments | Prescription Technology Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	0	0
Exit and other-related costs	0	3
Asset impairments and accelerated depreciation	0	1
Total	0	4
Operating Segments | Medical-Surgical Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	5	0
Exit and other-related costs	12	3
Asset impairments and accelerated depreciation	0	0
Total	17	3
Operating Segments | International
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	0	0
Exit and other-related costs	0	0
Asset impairments and accelerated depreciation	0	1
Total	0	1
Corporate
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net	(1)	(1)
Exit and other-related costs	28	2
Asset impairments and accelerated depreciation	2	0
Total	$ 29	$ 1