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Fair Value Measurement - FV of Commodity Derivatives (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Offsetting Derivative Assets [Abstract] |  |
Assets - gross amounts recognized | $ 322 | $ 450
Assets - amounts without right of setoff | 3 | 9
Assets - gross amounts | 319 | 441
Assets - gross amounts offset | 193 | 280
Assets - net amounts presented | 126 | 161
Assets - cash collateral | 4 | 0
Assets - net amounts | 122 | 161
Offsetting Derivative Liabilities [Abstract] |  |
Liabilities - gross amounts recognized | 311 | 400
Liabilities - amounts without right of setoff | 4 | 4
Liabilities - gross amounts recognized | 307 | 396
Liabilities - gross amounts offset | 193 | 280
Liabilities - net amounts presented | 114 | 116
Liabilities - cash collateral | 12 | 10
Commodity derivatives, liability | $ 102 | $ 106

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