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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 | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-Tax Gain (Loss) Recognized in Income on Derivatives | $ 222 | $ 404 | $ (316)
Operating Revenues [Member] | Energy-Related Contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-Tax Gain (Loss) Recognized in Income on Derivatives | 230 | 412 | (348)
Energy Costs [Member] | Energy-Related Contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-Tax Gain (Loss) Recognized in Income on Derivatives | $ (8) | $ (8) | $ 32

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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=64837297&loc=SL5624171-113959 + Details
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