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Restructuring and Asset Impairment Charges - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 28 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]          
Pre-tax restructuring and asset impairment charges $ 96 $ 0      
After-tax restructuring and asset impairment charges 85        
Pre-tax impairment charge 20        
After-tax impairment charges 16        
Payments for severance 6 $ 14      
Other accrued liabilities          
Restructuring Cost and Reserve [Line Items]          
Restructuring liabilities 28   $ 28 $ 28 $ 39
Other noncurrent liabilities          
Restructuring Cost and Reserve [Line Items]          
Restructuring liabilities 28   28 28 30
Strategic Growth Initiative Plan          
Restructuring Cost and Reserve [Line Items]          
Exit-related costs 24        
Net restructuring charges recognized 58        
Restructuring liabilities 37   37 37 0
Payments for severance 1        
Strategic Growth Initiative Plan | Severance and lease exit costs          
Restructuring Cost and Reserve [Line Items]          
Net restructuring charges recognized 58        
Net restructuring charges recognized, after tax 55        
Strategic Growth Initiative Plan | Minimum          
Restructuring Cost and Reserve [Line Items]          
Expected total pre-tax charges 150   150 150  
Strategic Growth Initiative Plan | Maximum          
Restructuring Cost and Reserve [Line Items]          
Expected total pre-tax charges 210   210 210  
Cost Alignment Plan          
Restructuring Cost and Reserve [Line Items]          
Net restructuring charges recognized       256  
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  
Fiscal 2018 McKesson Europe Plan          
Restructuring Cost and Reserve [Line Items]          
Restructuring liabilities 28   28 28 $ 42
Pre-tax charges incurred to-date     81    
Fiscal 2018 McKesson Europe Plan | Severance          
Restructuring Cost and Reserve [Line Items]          
Payments for severance 13        
Fiscal 2018 McKesson Europe Plan | Severance and lease exit costs          
Restructuring Cost and Reserve [Line Items]          
Net restructuring charges recognized 7        
Net restructuring charges recognized, after tax 6        
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  
Corporate          
Restructuring Cost and Reserve [Line Items]          
Net restructuring charges recognized 11        
Net restructuring charges recognized, after tax $ 8