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Equity Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]            
Equity Method Investments $ 177 $ 173   $ 173   $ 177
Equity in earnings of unconsolidated affiliates   $ 5 $ 4 $ 13 $ 38  
Proceeds from sale of equity method investments         403  
Gain on sale of equity method investments         $ 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   19.70%   19.70%    
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