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Derivatives and Financial Instruments (Summary of Commodity Derivative Assets and Liabilities) (Details) - Commodity derivatives - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Prepaid expenses and other current assets
Fair value of commodity derivative assets and liabilities, without netting
Assets	$ 741	$ 2,607
Other assets
Fair value of commodity derivative assets and liabilities, without netting
Assets	5	5
Other accruals
Fair value of commodity derivative assets and liabilities, without netting
Liabilities	766	2,425
Other liabilities and deferred credits
Fair value of commodity derivative assets and liabilities, without netting
Liabilities	$ 2	$ 5

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- Definition

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

+ References

No definition available.

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- Definition

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=64837297&loc=SL5624163-113959

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- Definition

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

+ References

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-Section 50
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