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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, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]        
Income from continuing operations $ 960 $ 649 $ 1,379 $ 1,647
Net income attributable to noncontrolling interests (58) (13) (169) (48)
Income from continuing operations attributable to McKesson 902 636 1,210 1,599
Income (loss) from discontinued operations, net of tax 1 (3) 3 (117)
Net Income Attributable to McKesson Corporation $ 903 $ 633 $ 1,213 $ 1,482
Weighted average common shares outstanding:        
Basic (in shares) 207 221 209 224
Effect of dilutive securities:        
Options to purchase common stock (in shares) 0 0 0 1
Restricted stock units (in shares) 1 1 1 1
Diluted (in shares) 208 222 210 226
Diluted        
Continuing operations (in dollars per share) $ 4.32 $ 2.86 $ 5.75 $ 7.07
Discontinued operations (in dollars per share) 0.01 (0.01) 0.01 (0.51)
Total (in dollars per share) 4.33 2.85 5.76 6.56
Basic        
Continuing operations (in dollars per share) 4.34 2.89 5.78 7.14
Discontinued operations (in dollars per share) 0.01 (0.02) 0.02 (0.52)
Total (in dollars per share) $ 4.35 $ 2.87 $ 5.80 $ 6.62