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Derivatives and Financial Instruments (Summary of Outstanding Commodity Derivative Contracts) (Details) - MMBbls	Jun. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Crude oil, refined products and NGL (millions of barrels)	(35)	(17)

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- Definition

Non monetary notional amount of price risk derivative instruments not designated as hedging instruments short position.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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