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Earnings Per Common Share - Schedule of Basic and Diluted Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Income from continuing operations $ 3,481 $ 3,160 $ 3,725
Net income attributable to noncontrolling interests (186) (158) (162)
Income from continuing operations attributable to McKesson Corporation 3,295 3,002 3,563
Loss from discontinued operations, net of tax 0 0 (3)
Net income attributable to McKesson Corporation $ 3,295 $ 3,002 $ 3,560
Weighted-average common shares outstanding:      
Basic (in shares) 127.4 133.2 141.1
Diluted (in shares) 128.1 134.1 142.2
Diluted      
Continuing operations (in dollars per share) $ 25.72 $ 22.39 $ 25.05
Discontinued operations (in dollars per share) 0 0 (0.02)
Total (in dollars per share) 25.72 22.39 25.03
Basic      
Continuing operations (in dollars per share) 25.86 22.54 25.25
Discontinued operations (in dollars per share) 0 0 (0.02)
Total (in dollars per share) $ 25.86 $ 22.54 $ 25.23
Stock options      
Weighted-average common shares outstanding:      
Effect of dilutive securities (in shares) 0.0 0.2 0.2
Restricted stock unit awards      
Weighted-average common shares outstanding:      
Effect of dilutive securities (in shares) 0.7 0.7 0.9