DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Derivative Assets and Liabilities and Locations on Consolidated Balance Sheet (Details) - Recurring - Commodity Derivative Instruments - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative asset	$ 17	$ 0
Current Assets: Prepaid assets and other
Derivatives, Fair Value [Line Items]
Derivative asset	13	0
Other Assets: Deferred charges and other
Derivatives, Fair Value [Line Items]
Derivative asset	$ 4	$ 0