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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, 2026
Mar. 31, 2025
Goodwill [Roll Forward]    
Goodwill, beginning balance $ 10,022 $ 10,132
Goodwill acquired 1,305 16
Disposals 37 46
Foreign currency translation adjustments, net 45 (80)
Other adjustments (19) 0
Goodwill, ending balance 11,316 10,022
PRISM Vision Holdings, LLC    
Goodwill [Roll Forward]    
Goodwill, beginning balance 432  
Goodwill, ending balance   432
Core Ventures    
Goodwill [Roll Forward]    
Goodwill, beginning balance 806  
Goodwill, ending balance   806
Operating Segments | North American Pharmaceutical    
Goodwill [Roll Forward]    
Goodwill, beginning balance 2,737 2,857
Goodwill acquired 0 1
Disposals 0 46
Foreign currency translation adjustments, net 44 (80)
Other adjustments 0 5
Goodwill, ending balance 2,781 2,737
Operating Segments | Oncology & Multispecialty    
Goodwill [Roll Forward]    
Goodwill, beginning balance 2,724 2,775
Goodwill acquired 1,266 0
Disposals 9 0
Foreign currency translation adjustments, net 0 0
Other adjustments (18) (51)
Goodwill, ending balance 3,963 2,724
Operating Segments | Prescription Technology Solutions    
Goodwill [Roll Forward]    
Goodwill, beginning balance 2,027 2,024
Goodwill acquired 39 11
Disposals 0 0
Foreign currency translation adjustments, net 0 0
Other adjustments (1) (8)
Goodwill, ending balance 2,065 2,027
Operating Segments | Medical-Surgical Solutions    
Goodwill [Roll Forward]    
Goodwill, beginning balance 2,507 2,453
Goodwill acquired 0 0
Disposals 0 0
Foreign currency translation adjustments, net 0 0
Other adjustments 0 54
Goodwill, ending balance 2,507 2,507
Other    
Goodwill [Roll Forward]    
Goodwill, beginning balance 27 23
Goodwill acquired 0 4
Disposals 28 0
Foreign currency translation adjustments, net 1 0
Other adjustments 0 0
Goodwill, ending balance $ 0 $ 27