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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     $ 10,057  
Other comprehensive income (loss) before reclassifications $ 29   (93)  
Amounts reclassified to earnings 3   4  
Other Comprehensive Income (Loss), Net of Tax 32 $ 259 (89) $ 580
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests (7)   (44)  
Other comprehensive income (loss) attributable to McKesson 39   (45)  
Ending balance 9,534   9,534  
Foreign Currency Translation Adjustments, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1,492)   (1,258)  
Other comprehensive income (loss) before reclassifications 5 303 (268) 685
Amounts reclassified to earnings 0 0 0 0
Other Comprehensive Income (Loss), Net of Tax 5 303 (268) 685
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests (7)   (46)  
Other comprehensive income (loss) attributable to McKesson 12   (222)  
Ending balance (1,480)   (1,480)  
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (44)   (188)  
Other comprehensive income (loss) before reclassifications 21 (38) 165 (108)
Amounts reclassified to earnings 0 0 0 0
Other Comprehensive Income (Loss), Net of Tax 21 (38) 165 (108)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests 0   0  
Other comprehensive income (loss) attributable to McKesson 21   165  
Ending balance (23)   (23)  
Unrealized Gains (Losses) on Cash Flow Hedges, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (61)   (61)  
Other comprehensive income (loss) before reclassifications 2 (3) 2 11
Amounts reclassified to earnings 0 0 0 0
Other Comprehensive Income (Loss), Net of Tax 2 $ (3) 2 $ 11
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests 0   0  
Other comprehensive income (loss) attributable to McKesson 2   2  
Ending balance (59)   (59)  
Unrealized Net Gains (Losses) and Other Components of Benefit Plans, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (204)   (210)  
Other comprehensive income (loss) before reclassifications 1   8  
Amounts reclassified to earnings 3   4  
Other Comprehensive Income (Loss), Net of Tax 4   12  
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests 0   2  
Other comprehensive income (loss) attributable to McKesson 4   10  
Ending balance (200)   (200)  
Total Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1,801)   (1,717)  
Ending balance $ (1,762)   $ (1,762)