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Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ (1,644)   $ (1,713)  
Other comprehensive income (loss) before reclassifications (247)   (165)  
Amounts reclassified to earnings and other 15   26  
Other Comprehensive Income (Loss), Net of Tax (232) $ (431) (139) $ (1,004)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests (31)   (7)  
Other comprehensive income (loss) attributable to McKesson (201)   (132)  
Ending balance (1,845)   (1,845)  
Foreign Currency Translation Adjustments, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1,346)   (1,420)  
Other comprehensive income (loss) before reclassifications (246)   (142)  
Amounts reclassified to earnings and other 0   0  
Other Comprehensive Income (Loss), Net of Tax (246)   (142)  
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests (32)   (2)  
Other comprehensive income (loss) attributable to McKesson (214)   (140)  
Ending balance (1,560)   (1,560)  
Unrealized Gains (Losses) on Cash Flow Hedges, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (15)   (21)  
Other comprehensive income (loss) before reclassifications (1)   5  
Amounts reclassified to earnings and other 0   0  
Other Comprehensive Income (Loss), Net of Tax (1)   5  
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests 0   0  
Other comprehensive income (loss) attributable to McKesson (1)   5  
Ending balance (16)   (16)  
Unrealized Net Gains (Losses) and Other Components of Benefit Plans, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (283)   (272)  
Other comprehensive income (loss) before reclassifications 0   (28)  
Amounts reclassified to earnings and other 15   26  
Other Comprehensive Income (Loss), Net of Tax 15   (2)  
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests 1   (5)  
Other comprehensive income (loss) attributable to McKesson 14   3  
Ending balance $ (269)   $ (269)