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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended
Feb. 11, 2019
Sep. 30, 2018
Dec. 31, 2017
Mar. 31, 2019
Dec. 31, 2018
Sep. 19, 2018
Fair Value Disclosures [Abstract]            
Fair value of debt       $ 4,400 $ 4,000  
Shiel Holdings LLC (Shiel)            
Business Acquisition [Line Items]            
Contingent consideration value high     $ 15      
Comparable company revenue volatility     6.90%      
Discount rate     4.50%      
Shiel Holdings LLC (Shiel) | Fair Value, Inputs, Level 3            
Business Acquisition [Line Items]            
Contingent consideration, liability     $ 6   $ 7  
ReproSource, Inc.            
Business Acquisition [Line Items]            
Contingent consideration value high           $ 10
Comparable company revenue volatility   8.50%        
Discount rate   6.50%        
ReproSource, Inc. | Fair Value, Inputs, Level 3            
Business Acquisition [Line Items]            
Contingent consideration, liability   $ 5        
Boyce & Bynum            
Business Acquisition [Line Items]            
Contingent consideration value high $ 25          
Comparable company revenue volatility 8.00%          
Discount rate 7.20%          
Boyce & Bynum | Fair Value, Inputs, Level 3            
Business Acquisition [Line Items]            
Contingent consideration, liability $ 6