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Fair Value Measurement - FV of Commodity Derivatives (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Offsetting Derivative Assets [Abstract]
Assets - gross amounts recognized	$ 377	$ 450
Assets - amounts without right of setoff	10	9
Assets - gross amounts	367	441
Assets - gross amounts offset	267	280
Assets - net amounts presented	100	161
Assets - cash collateral	0	0
Assets - net amounts	100	161
Offsetting Derivative Liabilities [Abstract]
Liabilities - gross amounts recognized	358	400
Liabilities - amounts without right of setoff	5	4
Liabilities - gross amounts recognized	353	396
Liabilities - gross amounts offset	267	280
Liabilities - net amounts presented	86	116
Liabilities - cash collateral	7	10
Liabilities - net amounts	$ 79	$ 106

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