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Restructuring and Asset Impairment Charges - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended 25 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]            
Restructuring and asset impairment charges     $ 567 $ 18 $ 203  
Pre-tax charge     13 14 229  
Cash payments for restructuring     45 106    
Severance and employee related costs         207  
Reserve balance $ 69   69 106 222 $ 69
Other Accrued Liabilities            
Restructuring Cost and Reserve [Line Items]            
Reserve balance 39   39 71   39
Other Noncurrent Assets/Liabilities            
Restructuring Cost and Reserve [Line Items]            
Reserve balance 30   30 35   30
Intangible Asset and Store Assets Impairment            
Restructuring Cost and Reserve [Line Items]            
Pre-tax charge     479      
Restructuring charges, after tax     443      
Reduction in Workforce            
Restructuring Cost and Reserve [Line Items]            
Severance and employee related costs         117  
Business Process Initiatives            
Restructuring Cost and Reserve [Line Items]            
Severance and employee related costs         90  
Fiscal 2018 McKesson Europe Plan            
Restructuring Cost and Reserve [Line Items]            
Pre-tax charges recorded to-date     74      
Reserve balance 42   42     42
Fiscal 2018 McKesson Europe Plan | Severance and Lease Exit Costs            
Restructuring Cost and Reserve [Line Items]            
Pre-tax charge     74      
Restructuring charges, after tax     67      
Fiscal 2018 McKesson Europe Plan | Intangible Asset and Store Assets Impairment            
Restructuring Cost and Reserve [Line Items]            
Pre-tax charge 257 $ 189 446      
Restructuring charges, after tax 253 $ 157 410      
Fiscal 2018 McKesson Europe Plan | Reduction in Workforce            
Restructuring Cost and Reserve [Line Items]            
Cash payments for restructuring     10      
Fiscal 2018 McKesson Europe Plan | Minimum            
Restructuring Cost and Reserve [Line Items]            
Expected total pre-tax charges 90   90     90
Fiscal 2018 McKesson Europe Plan | Maximum            
Restructuring Cost and Reserve [Line Items]            
Expected total pre-tax charges 130   130     130
Cost Alignment Plan            
Restructuring Cost and Reserve [Line Items]            
Pre-tax charge     13 $ 14 229  
Pre-tax charges recorded to-date           256
Cost Alignment Plan | Severance and Employee-Related Costs            
Restructuring Cost and Reserve [Line Items]            
Pre-tax charge         229  
Cost Alignment Plan | Minimum            
Restructuring Cost and Reserve [Line Items]            
Expected total pre-tax charges 250   250     250
Cost Alignment Plan | Maximum            
Restructuring Cost and Reserve [Line Items]            
Expected total pre-tax charges 270   $ 270     $ 270
Cost of Sales            
Restructuring Cost and Reserve [Line Items]            
Pre-tax charge         26  
Cost of Sales | Cost Alignment Plan | Severance and Employee-Related Costs            
Restructuring Cost and Reserve [Line Items]            
Pre-tax charge         26  
Operating Expenses            
Restructuring Cost and Reserve [Line Items]            
Pre-tax charge         203  
Operating Expenses | Cost Alignment Plan | Severance and Employee-Related Costs            
Restructuring Cost and Reserve [Line Items]            
Pre-tax charge         $ 203  
Customer relationships            
Restructuring Cost and Reserve [Line Items]            
Non-cash pre-tax and after-tax impairment charges $ 33