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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 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]        
Income from continuing operations $ 247 $ 527 $ 54 $ 998
Net income attributable to noncontrolling interests (56) (57) (163) (169)
Income (Loss) from continuing operations attributable to McKesson 191 470 (109) 829
Income (Loss) from discontinued operations, net of tax (5) (1) (12) 1
Net Income (Loss) Attributable to McKesson Corporation $ 186 $ 469 $ (121) $ 830
Weighted average common shares outstanding:        
Basic (in shares) 179 194 183 198
Effect of dilutive securities:        
Restricted stock units (in shares) 1 1 0 1
Diluted (in shares) 180 195 183 199
Diluted        
Continuing operations (in dollars per share) $ 1.06 $ 2.41 $ (0.60) $ 4.17
Discontinued operations (in dollars per share) (0.03) (0.01) (0.06) 0.01
Total (in dollars per share) 1.03 2.40 (0.66) 4.18
Basic        
Continuing operations (in dollars per share) 1.06 2.42 (0.60) 4.19
Discontinued operations (in dollars per share) (0.02) (0.01) (0.06) 0
Total (in dollars per share) $ 1.04 $ 2.41 $ (0.66) $ 4.19
Potentially dilutive securities (shares) 2 3   2