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Derivatives and Financial Instruments (Summary of Outstanding Commodity Derivative Contracts) (Details) - MMBbls	Dec. 31, 2016	Dec. 31, 2015
Commodity
Crude oil, refined products and NGL (millions of barrels)	(18)	(17)

X

- Definition

Net exposures from outstanding commodity derivative contracts.

+ References

No definition available.

+ Details

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X

- Definition

Non Monetary Notional Amount Of Price Risk Derivative Instruments Not Designated As Hedging Instruments In Short Position

+ References

No definition available.

+ Details

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Balance Type:	na
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