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INCOME TAXES - COMPONENTS OF INCOME BEFORE INCOME TAXES FROM OPERATIONS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
United States $ (109) $ (110) $ (279)
Foreign 49 455 (679)
(Loss) income before income taxes $ (60) $ 345 $ (958)