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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
€ / shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Noncontrolling Interest [Line Items]                
Put right redemption price per share (in euros per share) | € / shares     € 22.99          
Put right value, interest rate spread (as a percent)           5.00%    
Payments to acquire shares of Celesio       $ 50        
Number of redeemable noncontrolling interest shares repurchased (shares) | shares       1.9        
Carrying value of redeemable noncontrolling interests           $ 1,435 $ 1,327  
Maximum redemption value of redeemable noncontrolling interest           $ 1,310 $ 1,210  
Ownership percentage (as a percent)           77.00% 76.00%  
Noncontrolling Interests           $ 238 $ 178  
Net income attributable to noncontrolling interests $ 58 $ 13   $ 169 $ 48      
Net income attributable to McKesson and transfers from noncontrolling interests       1,216        
Mckesson Europe                
Noncontrolling Interest [Line Items]                
Annual recurring compensation (in Euros per share) | € / shares     € 0.83          
Noncontrolling Interest                
Noncontrolling Interest [Line Items]                
Decrease in redeemable noncontrolling interests       0        
Noncontrolling Interests   160     160 238 178 $ 84
Net income attributable to noncontrolling interests 46 3   137 15      
Redeemable Noncontrolling Interest                
Noncontrolling Interest [Line Items]                
Decrease in redeemable noncontrolling interests       53        
Carrying value of redeemable noncontrolling interests   1,311     1,311 $ 1,435 $ 1,327 $ 1,406
Net income attributable to noncontrolling interests       32 33      
Redeemable Noncontrolling Interest | Mckesson Europe                
Noncontrolling Interest [Line Items]                
Net income attributable to noncontrolling interests $ 12 $ 10   32 $ 33      
Additional Paid-in Capital                
Noncontrolling Interest [Line Items]                
Effect of changes in ownership interests with noncontrolling interests       $ 3