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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
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net income $ 831 $ 960
Net income attributable to noncontrolling interests (47) (45)
Net income attributable to McKesson Corporation $ 784 $ 915
Weighted-average common shares outstanding:    
Basic (in shares) 124.9 129.8
Diluted (in shares) 125.5 130.7
Earnings per common share attributable to McKesson Corporation:    
Diluted (in dollars per share) $ 6.25 $ 7.00
Basic (in dollars per share) $ 6.28 $ 7.04
Stock options    
Weighted-average common shares outstanding:    
Effect of dilutive securities (in shares) 0.0 0.1
Restricted stock units    
Weighted-average common shares outstanding:    
Effect of dilutive securities (in shares) 0.6 0.8