LEASES - Maturities of Lease Liabilities (Details) $ in Millions	Dec. 31, 2020 USD ($)
Operating Lease
Operating lease liability payments of 2021	$ 19
Operating lease liability payments of 2022	18
Operating lease liability payments of 2023	17
Operating lease liability payments of 2024	12
Operating lease liability payments of 2025	11
Operating lease liability payments thereafter	59
Operating lease total payments due	136
Operating lease interest	(25)
Operating lease liability present value	111
Finance Leases
Finance lease liability payments of 2021	11
Finance lease liability payments of 2022	7
Finance lease liability payments of 2023	4
Finance lease liability payments of 2024	1
Finance lease liability payments of 2025	0
Finance lease liability payments thereafter	0
Finance lease total payments due	23
Finance lease interest	(1)
Finance lease liability present value	$ 22