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Earnings Per Common Share - Schedule of Computation for Basic and Diluted Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
Income (Loss) from continuing operations $ (676) $ 552 $ (193) $ 471
Net income attributable to noncontrolling interests (53) (54) (107) (112)
Income (Loss) from continuing operations attributable to McKesson (729) 498 (300) 359
Income (Loss) from discontinued operations, net of tax (1) 1 (7) 2
Net Income (Loss) Attributable to McKesson Corporation $ (730) $ 499 $ (307) $ 361
Weighted average common shares outstanding:        
Basic (in shares) 183 198 185 200
Effect of dilutive securities:        
Restricted stock units (in shares) 0 1 0 1
Diluted (in shares) 183 199 185 201
Diluted        
Continuing operations (in dollars per share) $ (3.99) $ 2.51 $ (1.62) $ 1.79
Discontinued operations (in dollars per share) 0 0 (0.03) 0.01
Total (in dollars per share) (3.99) 2.51 (1.65) 1.80
Basic        
Continuing operations (in dollars per share) (3.99) 2.52 (1.62) 1.80
Discontinued operations (in dollars per share) 0 0 (0.03) 0.01
Total (in dollars per share) $ (3.99) $ 2.52 $ (1.65) $ 1.81