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Equity Investments (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]        
Equity method investment $ 199 $ 192    
Equity in earnings of unconsolidated affiliates $ 15 $ 22 $ 16  
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 14.50%      
Home Care [Member]        
Schedule of Equity Method Investments [Line Items]        
Percentage of ownership interest sold       80.00%
Equity method investment ownership percentage       20.00%
Disposal date Dec. 31, 2016