LEASES - Cash Flow Information Related to Lease (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ 55	$ 38
Operating cash flows from finance leases	3	4
Financing cash flows from finance leases	5	5
Leased assets obtained in exchange for new operating lease liabilities	20	35
Leased assets obtained in exchange for new finance lease liabilities	$ 6	$ 0