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INCOME TAXES - Changes in Liability for Tax Uncertainties, Excluding Interest (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Liability for tax uncertainties $ 4 $ 8  
Changes in liability for tax uncertainties, excluding interest      
Balance at beginning of year 28 37 $ 45
Additions for tax positions related to the current year 23 3 4
Additions for tax positions of prior years 0 1 3
Reductions for tax positions of prior years (2) (1) (5)
Reductions due to statute lapse (10) (10) (9)
Settlements, audit payments, refunds - net 0 (2) (1)
Balance at end of year $ 39 $ 28 $ 37