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Equity Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]            
Equity Method Investments $ 177 $ 170   $ 170   $ 177
Equity in earnings of unconsolidated affiliates   $ 5 $ 14 $ 9 $ 34  
Proceeds from sale of equity method investments         403  
Gain on sale of equity method investments     $ 94   $ 94  
Three Hospitals in Macon Georgia, [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment, Ownership Percentage   38.00%   38.00%    
HealthTrust [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment, Ownership Percentage   23.10%   23.10%    
Home Care [Member]            
Schedule of Equity Method Investments [Line Items]            
Percentage of Ownership Interest Sold 80.00%         80.00%
Equity Method Investment, Ownership Percentage 20.00%         20.00%
Equity Method Investments $ 32         $ 32
Disposal Date       Dec. 31, 2016