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Goodwill and Intangible Assets, Net - Schedule of Changes in the Carrying Amount of Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Goodwill [Roll Forward]    
Goodwill, beginning balance $ 10,132 $ 9,947
Goodwill acquired 16 195
Disposals (46)  
Foreign currency translation adjustments, net (80) (3)
Other adjustments 0 (7)
Goodwill, ending balance 10,022 10,132
U.S. Pharmaceutical    
Goodwill [Roll Forward]    
Goodwill, beginning balance 4,123 4,050
Goodwill acquired 1 80
Disposals 0  
Foreign currency translation adjustments, net 0 0
Other adjustments 8 (7)
Goodwill, ending balance 4,132 4,123
Prescription Technology Solutions    
Goodwill [Roll Forward]    
Goodwill, beginning balance 2,024 2,005
Goodwill acquired 11 19
Disposals 0  
Foreign currency translation adjustments, net 0 0
Other adjustments (8) 0
Goodwill, ending balance 2,027 2,024
Medical-Surgical Solutions    
Goodwill [Roll Forward]    
Goodwill, beginning balance 2,536 2,453
Goodwill acquired 0 83
Disposals 0  
Foreign currency translation adjustments, net 0 0
Other adjustments (29) 0
Goodwill, ending balance 2,507 2,536
International    
Goodwill [Roll Forward]    
Goodwill, beginning balance 1,449 1,439
Goodwill acquired 4 13
Disposals (46)  
Foreign currency translation adjustments, net (80) (3)
Other adjustments 0 0
Goodwill, ending balance 1,327 1,449
Corporate    
Goodwill [Roll Forward]    
Goodwill, beginning balance 0 0
Goodwill acquired 0 0
Disposals 0  
Foreign currency translation adjustments, net 0 0
Other adjustments 29 0
Goodwill, ending balance $ 29 $ 0