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Financial Risk Management Activities (Schedule Of Derivative Instruments Not Designated As Hedging Instruments And Impact On Results Of Operations) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-Tax Gain (Loss) Recognized in Income on Derivatives | $ 150 | $ 81 | $ 198 | $ (694)
Operating Revenues [Member] | Energy-Related Contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-Tax Gain (Loss) Recognized in Income on Derivatives | 154 | 93 | 202 | (759)
Energy Costs [Member] | Energy-Related Contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-Tax Gain (Loss) Recognized in Income on Derivatives | $ (4) | $ (12) | $ (4) | $ 65

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying 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 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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