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Equity Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]        
Equity Method Investments $ 177 $ 175   $ 177
Equity in earnings of unconsolidated affiliates   $ 3 $ 20  
Three Hospitals in Macon Georgia, [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage   38.00%    
HealthTrust [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage   23.10%    
Home Care [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage 20.00%     20.00%
Equity Method Investments $ 32     $ 32
Home Care [Member]        
Schedule of Equity Method Investments [Line Items]        
Percentage of Ownership Interest Sold 80.00%     80.00%
Disposal Date   Dec. 31, 2016