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EMPLOYEE BENEFITS - Plan Amounts Recognized in OCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Net periodic pension income	$ (22)	$ (5)	$ (16)
Net actuarial loss (gain)	37	(49)	49
Amortization of prior service credit	0	0	1
Amortization of net actuarial loss	(17)	(19)	(17)
Total gain (loss) recognized in other comprehensive loss	20	(68)	33
Total (loss) gain recognized in net periodic pension (income) cost and other comprehensive loss	$ (2)	$ (73)	$ 17

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Amount before tax, after reclassification adjustments, of (increase) decrease in net periodic benefit cost and other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

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