LEASES - Supplemental Cash Flow Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating cash flows for operating leases	$ 58
Operating cash flows for finance leases	1
Financing cash flows for finance leases	8
Right-of-Use asset obtained in exchange for operating lease liability	27
Right-of-Use asset obtained in exchange for finance lease liability	$ 0