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Pharmacies and Clinics Transactions - Narrative (Details) - Pharmacy and Clinic Business - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 15, 2016
Jan. 30, 2016
Dec. 16, 2015
Jan. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash consideration $ 1,900     $ 1,868  
Gain from sale of business 620        
Deferred income $ 694   $ 690 $ 694  
Weighted average remaining accounting useful lives     23 years    
Other noncurrent liabilities         $ 12
Scenario, Forecast | Minimum | SG&A          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Inflation-adjusted occupancy-related payment   $ 20      
Scenario, Forecast | Maximum | SG&A          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Inflation-adjusted occupancy-related payment   $ 25