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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
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Mar. 31, 2016 | Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |
Pre-Tax Gain (Loss) Recognized in Income on Derivatives | $ 218 | $ (66)
Operating Revenues [Member] | Energy-Related Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Pre-Tax Gain (Loss) Recognized in Income on Derivatives | 216 | (76)
Energy Costs [Member] | Energy-Related Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Pre-Tax Gain (Loss) Recognized in Income on Derivatives | $ 2 | $ 10

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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=56946850&loc=SL5624171-113959 + Details
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