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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Net income $ 5,099 $ 3,481 $ 3,160
Net income attributable to noncontrolling interests (215) (186) (158)
Adjustment to redemption value in net income attributable to noncontrolling interests (122) 0 0
Net income attributable to McKesson Corporation $ 4,762 $ 3,295 $ 3,002
Weighted-average common shares outstanding:      
Basic (in shares) 123.6 127.4 133.2
Diluted (in shares) 124.1 128.1 134.1
Earnings per common share attributable to McKesson Corporation      
Diluted (in dollars per share) $ 38.38 $ 25.72 $ 22.39
Basic (in dollars per share) $ 38.55 $ 25.86 $ 22.54
Stock options      
Weighted-average common shares outstanding:      
Effect of dilutive securities (in shares) 0.0 0.0 0.2
Restricted stock unit awards      
Weighted-average common shares outstanding:      
Effect of dilutive securities (in shares) 0.5 0.7 0.7