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Goodwill and Other Intangible Assets (Goodwill Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2016
Dec. 31, 2015
Goodwill [Line Items]        
Goodwill $ 6,901   $ 6,901 $ 8,965
Goodwill, Impairment Loss   $ 1,395 1,395  
Adjustment to initial impairment estimate (5)      
Goodwill allocated to QHC in the spin-off   709 709  
Write-down of long-lived assets 13 239    
Hospital Operations [Member]        
Goodwill [Line Items]        
Goodwill 6,900   6,900  
Goodwill allocated to QHC in the spin-off   676    
Home Care Agency Operations Reporting Unit [Member]        
Goodwill [Line Items]        
Goodwill $ 47   $ 47  
Hospital Management Services Reporting Unit [Member]        
Goodwill [Line Items]        
Goodwill allocated to QHC in the spin-off   $ 33