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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Realized gain (loss):
Unrealized gain (loss)			$ (52)	$ 88
Not Designated as Hedging Instrument
Realized gain (loss):
Derivative settlements, realized gain (loss)	$ (16)	$ 7	12	(110)
Amortization of put premium, realized loss	0	(14)	0	(24)
Unrealized gain (loss)	14	(16)	(52)	88
Derivative instrument losses, net	$ (2)	$ (23)	$ (40)	$ (46)

Amortization Of Put Premium, Realized Gain (Loss)

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

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-Name Accounting Standards Codification
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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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-Topic 230
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