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INCOME TAXES - Changes in Liability for Tax Uncertainties, Excluding Interest (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in liability for tax uncertainties, excluding interest      
Balance at beginning of year $ 45 $ 59 $ 61
Additions for tax positions related to the current year 4 4 14
Additions for tax positions of prior years 3 5 13
Reductions for tax positions of prior years (5) (13) (15)
Reductions due to statute lapse (9) (5) (1)
Settlements, audit payments, refunds - net (1) (5) (13)
Balance at end of year $ 37 $ 45 $ 59