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INCOME TAXES INCOME TAXES - UNCERTAIN TAX POSITIONS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Contingency [Line Items]        
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 33      
Income Tax Examination, Penalties and Interest Accrued 6 $ 5   $ 3
Income Tax Examination, Penalties and Interest Expense 1 2 $ 3  
Unrecognized Tax Benefits, Period Increase (Decrease) 3      
Beginning balance 43 40 32  
Additions related to prior years 1 16 0  
Releases related to prior years (4) (2) 0  
Additions related to current year activity 2 2 0  
Additions from acquisitions 0 0 8  
Releases due to settlements (1) (11) 0  
Releases due to lapse of statute of limitations (1) (2) 0  
Ending balance $ 40 $ 43 $ 40