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Earnings (Loss) 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, 2023
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Income (loss) from continuing operations $ 3,725 $ 1,292 $ (4,339)
Net income attributable to noncontrolling interests (162) (173) (199)
Income (loss) from continuing operations attributable to McKesson Corporation 3,563 1,119 (4,538)
Loss from discontinued operations, net of tax (3) (5) (1)
Net income (loss) attributable to McKesson Corporation $ 3,560 $ 1,114 $ (4,539)
Weighted-average common shares outstanding:      
Basic (in shares) 141.1 152.3 160.6
Diluted (in shares) 142.2 154.1 160.6
Diluted      
Continuing operations (in dollars per share) $ 25.05 $ 7.26 $ (28.26)
Discontinued operations (in dollars per share) (0.02) (0.03) 0
Total (in dollars per share) 25.03 7.23 (28.26)
Basic      
Continuing operations (in dollars per share) 25.25 7.35 (28.26)
Discontinued operations (in dollars per share) (0.02) (0.03) 0
Total (in dollars per share) $ 25.23 $ 7.32 $ (28.26)
Stock options      
Weighted-average common shares outstanding:      
Effect of dilutive securities (in shares) 0.2 0.2 0.0
Restricted stock unit awards      
Weighted-average common shares outstanding:      
Effect of dilutive securities (in shares) 0.9 1.6 0.0