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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
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.

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- References

No definition available.

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