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GOODWILL AND INTANGIBLE ASSETS (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2015
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]        
Intangible assets, net $ 984 $ 1,071    
Intangible assets, gross excluding goodwill 1,377 1,487    
Accumulated amortization, intangible assets 393 416    
Asset impairment charges 16      
Amortization of intangible assets 81 94 $ 79  
Noncompete Agreements, Fully Amortized [Member]        
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]        
Intangible assets, gross excluding goodwill       $ 37
Accumulated amortization, intangible assets       $ 37
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]        
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]        
Intangible assets, net 16      
Intangible assets, gross excluding goodwill 48      
Accumulated amortization, intangible assets 32      
MemorialCare and Superior Mobile Medics [Member]        
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]        
Goodwill deductible for tax purposes 32      
Acquired intangible assets $ 26      
Solstas, Summit Health and Steward [Member]        
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]        
Goodwill deductible for tax purposes   90    
Finite-lived intangibles   $ 270