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Goodwill Impairment Charges (Details)
3 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
reporting_unit
Mar. 31, 2019
USD ($)
Goodwill [Line Items]      
Pretax goodwill impairment charges $ 0 $ 570,000,000  
Goodwill 9,441,000,000   $ 9,358,000,000
European Pharmaceutical Solutions      
Goodwill [Line Items]      
Pretax goodwill impairment charges   570,000,000  
After-tax goodwill impairment   $ 570,000,000  
Number of reporting units | reporting_unit   2  
Goodwill $ 40,000,000   $ 0
European Pharmaceutical Solutions | Pharmaceutical Distributions Reporting Unit      
Goodwill [Line Items]      
Pretax goodwill impairment charges   $ 238,000,000  
After-tax goodwill impairment   $ 238,000,000  
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   $ 332,000,000  
After-tax goodwill impairment   $ 332,000,000  
Discount rate (percent)   8.50%  
Terminal growth rate (percent)   1.25%