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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 18, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Apr. 16, 2014
Business Acquisition [Line Items]          
Contingent consideration $ 26        
Fair value of debt   $ 3,700   $ 3,900  
Summit Health, Inc. [Member]          
Business Acquisition [Line Items]          
Contingent consideration 22 0 $ 13    
Contingent consideration arrangements, range of outcomes, value, high $ 25        
Summit Health, Inc. [Member] | Contingent Consideration [Member]          
Business Acquisition [Line Items]          
Included in earnings   $ 13 $ 9    
Steward Health Care Systems, LLC [Member]          
Business Acquisition [Line Items]          
Contingent consideration         $ 4
Contingent consideration arrangements, range of outcomes, value, high       $ 4  
Minimum [Member]          
Business Acquisition [Line Items]          
Fair value inputs, probability of occurrence 5.00%        
Discount rate 1.50%        
Maximum [Member]          
Business Acquisition [Line Items]          
Fair value inputs, probability of occurrence 95.00%        
Discount rate 2.80%