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Equity Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Apr. 29, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]            
Equity Method Investments $ 144   $ 144     $ 487
Equity in earnings of unconsolidated affiliates $ 4 $ 12 38 $ 51    
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 23.10%   23.10%      
Universal Health Services, Inc. [Member]            
Schedule of Equity Method Investments [Line Items]            
Disposal Date     Apr. 29, 2016      
Proceeds from sale of equity method investments     $ 403      
Gain on sale of equity method investments     $ 94      
Universal Health Services, Inc. [Member] | Four Hospitals in Las Vegas, Nevada [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment, Ownership Percentage         27.50%  
Universal Health Services, Inc. [Member] | One Hospital in Las Vegas, Nevada [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment, Ownership Percentage         26.10%