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Fair Value Measurement - FV of Commodity Derivatives (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Offsetting Derivative Assets [Abstract] |  |
Assets - gross amounts recognized | $ 301 | $ 322
Assets - amounts without right of setoff | 1 | 3
Assets - gross amounts | 300 | 319
Assets - gross amounts offset | 204 | 193
Assets - net amounts presented | 96 | 126
Assets - cash collateral | 5 | 4
Assets - net amounts | 91 | 122
Offsetting Derivative Liabilities [Abstract] |  |
Liabilities - gross amounts recognized | 277 | 311
Liabilities - amounts without right of setoff | 0 | 4
Liabilities - gross amounts recognized | 277 | 307
Liabilities - gross amounts offset | 204 | 193
Liabilities - net amounts presented | 73 | 114
Liabilities - cash collateral | 7 | 12
Liabilities - net amounts | $ 66 | $ 102

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