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Earnings Per Common Share (Basic and Diluted Earnings per Common Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]    
Income from continuing operations $ 599 $ 419
Net income attributable to noncontrolling interests (13) (8)
Income from continuing operations attributable to McKesson 586 411
Loss from discontinued operations, net of tax (10) (8)
Net Income Attributable to McKesson Corporation $ 576 $ 403
Weighted Average Common Shares (in shares)    
Basic 232 231
Effect of dilutive securities: (in shares)    
Options to purchase common stock 1 2
Restricted stock units 2 2
Diluted 235 235
Diluted (in dollars per share)    
Continuing operations [1] $ 2.50 $ 1.76
Discontinued operations [1] (0.05) (0.04)
Total [1] 2.45 1.72
Basic (in dollars per share)    
Continuing operations [1] 2.53 1.79
Discontinued operations [1] (0.04) (0.04)
Total [1] $ 2.49 $ 1.75
[1] Certain computations may reflect rounding adjustments.