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EMPLOYEE BENEFITS - Plan Amounts Recognized in OCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]      
Net periodic pension income $ (5) $ (16) $ (2)
Net actuarial (gain) loss (49) 49 (31)
Amortization of prior service credit 0 1 1
Amortization of net actuarial loss (19) (17) (18)
Total (loss) gain recognized in other comprehensive loss (68) 33 (48)
Total (loss) gain recognized in net periodic pension (income) cost and other comprehensive loss $ (73) $ 17 $ (50)