ACCRUED LIABILITIES - Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Accrued Liabilities Current [Abstract]
Compensation and employee benefit costs	$ 204	$ 188
Current portion of lease liabilities (Note 17)	26	33
Customer rebates, volume discounts and deferred income	111	105
Interest	87	98
Taxes payable	75	24
Other	93	82
Total	$ 596	$ 530