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Restructuring, Impairment, and Related Charges, Net - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Cost Alignment Plan      
Beginning balance $ 126 $ 55  
Restructuring, impairment, and related charges, net 245 344 $ 115
Non-cash charges (29) (98)  
Cash payments (299) (164)  
Other 1 (11)  
Ending balance 44 126 55
Operating Segments | North American Pharmaceutical      
Cost Alignment Plan      
Beginning balance 11 23  
Restructuring, impairment, and related charges, net 24 59 20
Non-cash charges (12) (58)  
Cash payments (4) (8)  
Other (1) (5)  
Ending balance 18 11 23
Operating Segments | Oncology & Multispecialty      
Cost Alignment Plan      
Beginning balance 0 3  
Restructuring, impairment, and related charges, net 0 1 9
Non-cash charges 0 (1)  
Cash payments 0 (2)  
Other 0 (1)  
Ending balance 0 0 3
Operating Segments | Prescription Technology Solutions      
Cost Alignment Plan      
Beginning balance 1 5  
Restructuring, impairment, and related charges, net 20 12 11
Non-cash charges (17) (9)  
Cash payments (1) (4)  
Other 0 (3)  
Ending balance 3 1 5
Operating Segments | Medical-Surgical Solutions      
Cost Alignment Plan      
Beginning balance 90 1  
Restructuring, impairment, and related charges, net 43 204 11
Non-cash charges 8 (14)  
Cash payments (133) (99)  
Other 2 (2)  
Ending balance 10 90 1
Corporate & Other      
Cost Alignment Plan      
Beginning balance 24 23  
Restructuring, impairment, and related charges, net 158 68 64
Non-cash charges (8) (16)  
Cash payments (161) (51)  
Other 0 0  
Ending balance 13 24 23
Other Accrued Liabilities      
Cost Alignment Plan      
Beginning balance 103 24  
Ending balance 30 103 24
Other Noncurrent Liabilities      
Cost Alignment Plan      
Beginning balance 23 31  
Ending balance $ 14 $ 23 $ 31