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Goodwill and Other Intangible Assets (Goodwill Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Goodwill [Line Items]      
Goodwill $ 6,926 $ 6,926 $ 8,965
Goodwill, Impairment Loss   1,400  
Goodwill allocated to QHC in the spin-off 709 709  
Write-down of Long-lived Assets 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