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INCOME TAXES - Uncertain Tax Positions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Uncertain Tax Positions    
Balance at the beginning of the period $ 54 $ 46
Total balance at beginning of the period 62 55
Current year tax positions: Additions 13 13
Current year tax positions: Reductions (1)  
Prior year tax positions: Additions 1 3
Prior year tax positions: Reductions (1) (1)
Lapse of applicable statute of limitations (8) (7)
Balance at the end of the period 58 54
Total balance at the end of the period 67 62
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract]    
Interest and penalties at period start 8 9
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 1 (1)
Interest and penalties at period end $ 9 $ 8