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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, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]        
Income from continuing operations $ 527 $ 960 $ 998 $ 1,379
Net income attributable to noncontrolling interests (57) (58) (169) (169)
Income from continuing operations attributable to McKesson 470 902 829 1,210
(Loss) Income from discontinued operations, net of tax (1) 1 1 3
Net Income Attributable to McKesson Corporation $ 469 $ 903 $ 830 $ 1,213
Weighted average common shares outstanding:        
Basic (in shares) 194 207 198 209
Effect of dilutive securities:        
Restricted stock units (in shares) 1 1 1 1
Diluted (in shares) 195 208 199 210
Diluted        
Continuing operations (in dollars per share) $ 2.41 $ 4.32 $ 4.17 $ 5.75
Discontinued operations (in dollars per share) (0.01) 0.01 0.01 0.01
Total (in dollars per share) 2.40 4.33 4.18 5.76
Basic        
Continuing operations (in dollars per share) 2.42 4.34 4.19 5.78
Discontinued operations (in dollars per share) (0.01) 0.01 0.00 0.02
Total (in dollars per share) $ 2.41 $ 4.35 $ 4.19 $ 5.80