LEASES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Renewal term	20 years
Finance lease, right-of-use asset	$ 42
Finance lease, right-of-use asset, accumulated amortization	$ 13
Operating leases, rent expense		$ 63	$ 49
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	23 years