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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, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]        
Income from continuing operations $ 642 $ 521 $ 1,877 $ 1,431
Net income attributable to noncontrolling interests (13) (39) (39) (55)
Income from continuing operations attributable to McKesson 629 482 1,838 1,376
Income (Loss) from discontinued operations, net of tax 5 (10) (11) (32)
Net Income Attributable to McKesson Corporation $ 634 $ 472 $ 1,827 $ 1,344
Weighted average common shares outstanding:        
Basic (in shares) 230 232 231 232
Effect of dilutive securities:        
Options to purchase common stock (in shares) 1 2 1 1
Restricted stock units (in shares) 1 2 2 2
Diluted (in shares) 232 236 234 235
Diluted        
Continuing operations (in dollars per share) $ 2.71 $ 2.04 $ 7.86 $ 5.85
Discontinued operations (in dollars per share) 0.02 (0.04) (0.05) (0.13)
Total (in dollars per share) 2.73 2.00 7.81 5.72
Basic        
Continuing operations (in dollars per share) 2.74 2.07 7.95 5.94
Discontinued operations (in dollars per share) 0.02 (0.04) (0.04) (0.14)
Total (in dollars per share) $ 2.76 $ 2.03 $ 7.91 $ 5.80