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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended
Feb. 28, 2018
Dec. 31, 2017
Mar. 31, 2018
Feb. 01, 2018
Apr. 16, 2014
Fair Value Disclosures [Abstract]          
Fair value of debt   $ 4,000 $ 4,100    
Steward Health Care Systems, LLC [Member]          
Business Acquisition [Line Items]          
Contingent consideration, liability     1   $ 4
Shiel Holdings LLC (Shiel) [Member]          
Business Acquisition [Line Items]          
Contingent consideration value high   $ 15      
Comparable company revenue volatility   6.90%      
Discount rate   4.50%      
Shiel Holdings LLC (Shiel) [Member] | Fair Value, Inputs, Level 3 [Member]          
Business Acquisition [Line Items]          
Contingent consideration, liability   $ 6 $ 7    
Mobile Medical Examination Services, Inc. (MedXM) [Member]          
Business Acquisition [Line Items]          
Contingent consideration, liability       $ 12  
Contingent consideration value high       30  
Comparable company revenue volatility 12.70%        
Discount rate 5.40%        
Mobile Medical Examination Services, Inc. (MedXM) [Member] | Fair Value, Inputs, Level 3 [Member]          
Business Acquisition [Line Items]          
Contingent consideration, liability       $ 12