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Derivatives and Financial Instruments (Summary of Commodity Derivative Assets and Liabilities) (Details) - Commodity Derivatives [Member] - USD ($) $ in Millions		Jun. 30, 2016	Dec. 31, 2015
Prepaid Expenses and Other Current Assets [Member]
Fair value of commodity derivative assets and liabilities, without netting
Commodity derivative assets, fair value gross	[1]	$ 612	$ 2,607
Other Assets [Member]
Fair value of commodity derivative assets and liabilities, without netting
Commodity derivative assets, fair value gross	[1]	20	5
Other Accruals [Member]
Fair value of commodity derivative assets and liabilities, without netting
Commodity derivative liabilities, fair value gross	[1]	637	2,425
Other Liabilities and Deferred Credits [Member]
Fair value of commodity derivative assets and liabilities, without netting
Commodity derivative liabilities, fair value gross	[1]	$ 17	$ 5
[1] Hedge accounting has not been used for any item in the table.

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Derivative assets liabilities at fair value gross by balance sheet classification.

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Fair value as of the balance sheet date of all price risk derivative assets not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

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Fair value as of the balance sheet date of all price risk derivative liabilities not designated as hedging instruments.

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-SubTopic 10
-Section 50
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