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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 18, 2014
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 07, 2017
Jun. 30, 2015
Business Acquisition [Line Items]              
Other operating (expense) income, net     $ (1) $ 13 $ (11)    
Fair value of debt   $ 4,000 4,000 $ 3,900      
Summit Health, Inc. and Steward Health Care Systems, LLC [Member]              
Business Acquisition [Line Items]              
Estimated fair value of contingent consideration $ 26            
Summit Health, Inc. [Member]              
Business Acquisition [Line Items]              
Estimated fair value of contingent consideration             $ 0
Other operating (expense) income, net         $ 13    
Steward Health Care Systems, LLC [Member]              
Business Acquisition [Line Items]              
Estimated fair value of contingent consideration   $ 1 1        
Shiel Holdings LLC (Shiel) [Member]              
Business Acquisition [Line Items]              
Estimated fair value of contingent consideration           $ 6  
Discount rate   4.50%          
Contingent consideration arrangements, range of outcomes, value, high   $ 15 15        
Comparable company revenue volatility   6.90%          
Shiel Holdings LLC (Shiel) [Member] | Level 3 [Member]              
Business Acquisition [Line Items]              
Estimated fair value of contingent consideration   $ 6 $ 6        
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%