DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Derivative Activities Recorded in the Statement of Consolidated Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Realized gain (loss):
Unrealized loss			$ (42)	$ 0
Not Designated as Hedging Instrument
Realized gain (loss):
Derivative settlements, realized gain	$ 23	$ 0	23	0
Amortization of put premium, realized loss	(50)	0	(50)	0
Unrealized loss	(83)	0	(42)	0
Derivative instrument losses, net	$ (110)	$ 0	$ (69)	$ 0