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Earnings Per Common Share - Schedule of Computations for Basic and Diluted Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net income $ 287 $ 703 $ 1,247 $ 1,700
Net income attributable to noncontrolling interests (46) (39) (91) (78)
Net income attributable to McKesson Corporation $ 241 $ 664 $ 1,156 $ 1,622
Weighted-average common shares outstanding:        
Basic (in shares) 128.7 134.1 129.3 134.8
Diluted (in shares) 129.3 134.8 130.0 135.7
Earnings (loss) per common share attributable to McKesson Corporation:        
Diluted (in usd per share) $ 1.87 $ 4.92 $ 8.89 $ 11.95
Basic (in usd per share) $ 1.88 $ 4.95 $ 8.94 $ 12.03
Stock options        
Weighted-average common shares outstanding:        
Effect of dilutive securities (in shares) 0.1 0.2 0.1 0.2
Restricted stock units        
Weighted-average common shares outstanding:        
Effect of dilutive securities (in shares) 0.5 0.5 0.6 0.7