Derivative Financial Instruments (Schedule Of Derivative Financial Instruments Included In The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	$ 695	$ 2,004
Fair value of derivative liabilities	55	57
Commodity Derivatives [Member] \| Derivatives, At Fair Value [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	687	1,984
Commodity Derivatives [Member] \| Other Long-Term Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	4	11
Commodity Derivatives [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	19	28
Commodity Derivatives [Member] \| Other Long-Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	5	28
Interest Rate Derivatives [Member] \| Derivatives, At Fair Value [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	1	1
Interest Rate Derivatives [Member] \| Other Long-Term Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	1
Interest Rate Derivatives [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	1	1
Interest Rate Derivatives [Member] \| Other Long-Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	30
Foreign Currency Derivatives [Member] \| Derivatives, At Fair Value [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	$ 2	$ 8

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

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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- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability.

+ References

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- Definition

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+ References

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