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Fair Value Measurement - FV of Commodity Derivatives (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Offsetting Derivative Assets [Abstract]
Assets - gross amounts recognized	$ 301	$ 311
Assets - gross amounts offset	206	186
Assets - net amounts presented	95	125
Assets - cash collateral	0	0
Assets - amounts without right of setoff	7	4
Assets - net amounts	88	121
Offsetting Derivative Liabilities [Abstract]
Liabilities - gross amounts recognized	315	310
Liabilities - gross amounts offset	206	186
Liabilities - net amounts presented	109	124
Liabilities - cash collateral	2	7
Liabilities - amounts without right of setoff	3	5
Liabilities - net amounts	$ 104	$ 112

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