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Restructuring and Asset Impairment Charges - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]              
Pre-tax restructuring and asset impairment charges $ 82   $ 236 $ 178 $ 236    
After-tax restructuring and asset impairment charges 67   197 152      
Pre-tax impairment charge   $ 20          
After-tax impairment charges   $ 16          
Strategic Growth Initiative Plan              
Restructuring Cost and Reserve [Line Items]              
Exit-related costs 45     69      
Net restructuring charges recognized 53     111      
Restructuring liabilities 58     58   $ 58 $ 0
Payments for severance       31      
Strategic Growth Initiative Plan | Severance and lease exit costs              
Restructuring Cost and Reserve [Line Items]              
Net restructuring charges recognized 53     111      
Net restructuring charges recognized, after tax 45     100      
Strategic Growth Initiative Plan | Severance and other restructuring-related costs              
Restructuring Cost and Reserve [Line Items]              
Net restructuring charges recognized 22     33      
Net restructuring charges recognized, after tax 16     24      
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  
Fiscal 2018 McKesson Europe Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring liabilities 31     31   31 42
Pre-tax charges incurred to-date           85  
Fiscal 2018 McKesson Europe Plan | Severance              
Restructuring Cost and Reserve [Line Items]              
Payments for severance 3     16      
Fiscal 2018 McKesson Europe Plan | Severance and lease exit costs              
Restructuring Cost and Reserve [Line Items]              
Net restructuring charges recognized 4   47 11 47    
Net restructuring charges recognized, after tax 3   40 9 40    
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  
Fiscal 2016 Cost Alignment Plan              
Restructuring Cost and Reserve [Line Items]              
Payments for severance 5   $ 9 11 23    
Fiscal 2016 Cost Alignment Plan | Other accrued liabilities              
Restructuring Cost and Reserve [Line Items]              
Restructuring liabilities 27     27   27 39
Fiscal 2016 Cost Alignment Plan | Other noncurrent liabilities              
Restructuring Cost and Reserve [Line Items]              
Restructuring liabilities $ 27     27   $ 27 $ 30
Operating Segments | European Pharmaceutical Solutions              
Restructuring Cost and Reserve [Line Items]              
Pre-tax restructuring and asset impairment charges         236    
After-tax goodwill impairment       $ 570      
After-tax restructuring and asset impairment charges         $ 197