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Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     $ 11,273  
Other comprehensive income (loss) before reclassifications $ 258   578  
Amounts reclassified to earnings and other 1   2  
Other Comprehensive Income (Loss), Net of Tax 259 $ (114) 580 $ (358)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests 33   149  
Other comprehensive income (loss) attributable to McKesson 226   431  
Ending balance 11,362   11,362  
Foreign Currency Translation Adjustments, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1,606)   (1,873)  
Other comprehensive income (loss) before reclassifications 303 (109) 685 (384)
Amounts reclassified to earnings and other 0 0 0 20
Other Comprehensive Income (Loss), Net of Tax 303 (109) 685 (364)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests 33   148  
Other comprehensive income (loss) attributable to McKesson 270   537  
Ending balance (1,336)   (1,336)  
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (78)   (8)  
Other comprehensive income (loss) before reclassifications (38) 0 (108) 0
Amounts reclassified to earnings and other 0 0 0 0
Other Comprehensive Income (Loss), Net of Tax (38) 0 (108) 0
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests 0   0  
Other comprehensive income (loss) attributable to McKesson (38)   (108)  
Ending balance (116)   (116)  
Unrealized Gains (Losses) on Cash Flow Hedges, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (17)   (31)  
Other comprehensive income (loss) before reclassifications (3)   11  
Amounts reclassified to earnings and other 0   0  
Other Comprehensive Income (Loss), Net of Tax (3) $ (6) 11 $ (6)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests 0   0  
Other comprehensive income (loss) attributable to McKesson (3)   11  
Ending balance (20)   (20)  
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (235)   (229)  
Other comprehensive income (loss) before reclassifications (4)   (10)  
Amounts reclassified to earnings and other 1   2  
Other Comprehensive Income (Loss), Net of Tax (3)   (8)  
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests 0   1  
Other comprehensive income (loss) attributable to McKesson (3)   (9)  
Ending balance (238)   (238)  
Total Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1,936)   (2,141)  
Ending balance $ (1,710)   $ (1,710)