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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Income from continuing operations $ 56 $ 325 $ 419 $ 998
Net income attributable to noncontrolling interests (55) (17) (111) (35)
Income from continuing operations attributable to McKesson 1 308 308 963
Income (loss) from discontinued operations, net of tax 0 (1) 2 (114)
Net Income Attributable to McKesson Corporation $ 1 $ 307 $ 310 $ 849
Weighted average common shares outstanding:        
Basic (in shares) 209 226 210 226
Effect of dilutive securities:        
Options to purchase common stock (in shares) 0 1 0 1
Restricted stock units (in shares) 1 1 1 1
Diluted (in shares) 210 228 211 228
Diluted        
Continuing operations (in dollars per share) $ 0.01 $ 1.35 $ 1.46 $ 4.22
Discontinued operations (in dollars per share) 0.00 (0.01) 0.01 (0.50)
Total (in dollars per share) 0.01 1.34 1.47 3.72
Basic        
Continuing operations (in dollars per share) 0.01 1.36 1.47 4.27
Discontinued operations (in dollars per share) 0.00 0.00 0.01 (0.51)
Total (in dollars per share) $ 0.01 $ 1.36 $ 1.48 $ 3.76