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Derivatives and Financial Instruments (Summary of Outstanding Commodity Derivative Contracts) (Details) - MMBbls MMBbls in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Crude oil, refined petroleum products and NGL (millions of barrels) | (36) | (16)

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- Definition Non Monetary Notional Amount Of Price Risk Derivative Instruments Not Designated As Hedging Instruments, Net + References No definition available. + Details
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- References No definition available. + Details
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