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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

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