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Goodwill Impairment Charges (Details)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
reporting_unit
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Goodwill [Line Items]          
Pretax goodwill impairment charges $ 0 $ 0   $ 0 $ 570
European Pharmaceutical Solutions          
Goodwill [Line Items]          
Pretax goodwill impairment charges         570
After-tax goodwill impairment         $ 570
Number of reporting units | reporting_unit     2    
European Pharmaceutical Solutions | Pharmaceutical Distributions Reporting Unit          
Goodwill [Line Items]          
Pretax goodwill impairment charges     $ 238    
After-tax goodwill impairment     $ 238    
Discount rate (percent)     8.00%    
Terminal growth rate (percent)     1.25%    
European Pharmaceutical Solutions | Retail Pharmacy Reporting Unit          
Goodwill [Line Items]          
Pretax goodwill impairment charges     $ 332    
After-tax goodwill impairment     $ 332    
Discount rate (percent)     8.50%    
Terminal growth rate (percent)     1.25%