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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 18, 2014
Jun. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Jan. 02, 2013
Business Acquisition [Line Items]          
Contingent consideration, liability $ 26,000,000        
Fair value of debt   $ 3,800,000,000 $ 3,800,000,000 $ 4,200,000,000  
Fair value in excess of carrying value of debt   84,000,000 84,000,000 416,000,000  
Contingent Consideration [Member] | Other Operating (Income) Expense [Member]          
Business Acquisition [Line Items]          
Included in earnings   0 0    
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%        
Summit Health, Inc. [Member]          
Business Acquisition [Line Items]          
Contingent consideration, liability   0 0 $ 13,000,000  
Contingent consideration value high $ 25,000,000        
Steward Health Care Systems, LLC [Member] [Member]          
Business Acquisition [Line Items]          
Contingent consideration value high   $ 4,000,000 $ 4,000,000    
UMass [Member]          
Business Acquisition [Line Items]          
Percentage of equity interest expected to be divested         18.90%