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Restructuring, Impairment, and Related Charges, Net - Summary of Details for Charges Recorded (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Restructuring Cost and Reserve [Line Items]      
Severance and employee-related costs, net $ 138 $ 10 $ 35
Exit and other-related costs 108 62 102
Asset impairments and accelerated depreciation 98 43 72
Total 344 115 209
Restructuring, impairment, and related charges, net 286 115 209
Cost of Sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring, impairment, and related charges, net 58    
Operating Segments | U.S. Pharmaceutical      
Restructuring Cost and Reserve [Line Items]      
Severance and employee-related costs, net (2) 10 6
Exit and other-related costs 3 3 7
Asset impairments and accelerated depreciation 58 4 25
Total 59 17 38
Operating Segments | Prescription Technology Solutions      
Restructuring Cost and Reserve [Line Items]      
Severance and employee-related costs, net 0 0 23
Exit and other-related costs 3 11 7
Asset impairments and accelerated depreciation 9 0 13
Total 12 11 43
Operating Segments | Medical-Surgical Solutions      
Restructuring Cost and Reserve [Line Items]      
Severance and employee-related costs, net 137 (1) 2
Exit and other-related costs 53 12 3
Asset impairments and accelerated depreciation 14 0 5
Total 204 11 10
Operating Segments | International      
Restructuring Cost and Reserve [Line Items]      
Severance and employee-related costs, net 0 2 4
Exit and other-related costs 0 9 21
Asset impairments and accelerated depreciation 1 10 10
Total 1 21 35
Corporate      
Restructuring Cost and Reserve [Line Items]      
Severance and employee-related costs, net 3 (1) 0
Exit and other-related costs 49 27 64
Asset impairments and accelerated depreciation 16 29 19
Total $ 68 $ 55 $ 83