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Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Beginning balance $ 9,008 $ 8,085 $ 10,318
Other comprehensive income (loss) before reclassifications (688) 142  
Amounts reclassified to earnings 29 30  
Other Comprehensive Income (Loss), Net of Tax (659) 172 (1,989)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests (79) 20  
Other comprehensive income (loss) attributable to McKesson (580) 152 (1,884)
Ending balance 11,273 9,008 8,085
Foreign Currency Translation Adjustments, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Beginning balance (1,323) (1,420)  
Other comprehensive income (loss) before reclassifications (644) 113 (1,845)
Amounts reclassified to earnings 20 0 (10)
Other Comprehensive Income (Loss), Net of Tax (624) 113 (1,855)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests (74) 16  
Other comprehensive income (loss) attributable to McKesson (550) 97  
Ending balance (1,873) (1,323) (1,420)
Unrealized Losses on Net Investment Hedges, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Beginning balance 0 0  
Other comprehensive income (loss) before reclassifications (8) 0 0
Amounts reclassified to earnings 0 0 0
Other Comprehensive Income (Loss), Net of Tax (8) 0 0
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests 0 0  
Other comprehensive income (loss) attributable to McKesson (8) 0  
Ending balance (8) 0 0
Unrealized Gains (Losses) on Cash Flow Hedges, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Beginning balance (12) (21)  
Other comprehensive income (loss) before reclassifications (19) 6 (13)
Amounts reclassified to earnings 0 3 3
Other Comprehensive Income (Loss), Net of Tax (19) 9 (10)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests 0 0  
Other comprehensive income (loss) attributable to McKesson (19) 9  
Ending balance (31) (12) (21)
Unrealized Net Gains (Losses) and Other Components of Benefit Plans, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Beginning balance (226) (272)  
Other comprehensive income (loss) before reclassifications (17) 23  
Amounts reclassified to earnings 9 27  
Other Comprehensive Income (Loss), Net of Tax (8) 50  
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests (5) 4  
Other comprehensive income (loss) attributable to McKesson (3) 46  
Ending balance (229) (226) (272)
Total Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Beginning balance (1,561) (1,713) (3)
Other comprehensive income (loss) attributable to McKesson (580) 152 (1,710)
Ending balance $ (2,141) $ (1,561) $ (1,713)