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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Income from continuing operations $ 1,032 $ 831
Net income attributable to noncontrolling interests (44) (47)
Adjustment to redemption value in net income attributable to noncontrolling interests (374) 0
Net income attributable to McKesson Corporation $ 614 $ 784
Weighted-average common shares outstanding:    
Basic (in shares) 118.7 124.9
Diluted (in shares) 119.2 125.5
Earnings per common share attributable to McKesson Corporation:    
Diluted (in dollars per share) $ 5.15 $ 6.25
Basic (in dollars per share) $ 5.17 $ 6.28
Restricted stock units    
Weighted-average common shares outstanding:    
Effect of dilutive securities (in shares) 0.5 0.6