DEBT AND FINANCING COSTS - Components of Financing Costs, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Disclosure [Abstract]
Interest expense	$ 113	$ 107	$ 327	$ 323
Amortization of debt issuance costs	2	2	6	5
Capitalized interest	(3)	(9)	(9)	(26)
Loss (gain) on extinguishment of debt	12	0	152	(75)
Interest income	(1)	(5)	(4)	(12)
Financing costs, net	$ 99	$ 95	$ 168	$ 365