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Financial Risk Management Activities (Schedule Of Derivative Instruments Designated As Cash Flow Hedges) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | $ 1 | $ 1 | $ 3 | $ 2
Interest Expense | (99) | (96) | (288) | (291)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) | 0 | 0 | 0 | 0
Operating Revenues | 2,450 | 2,688 | 6,971 | 8,137
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion) | 0 | 0 | 0 | 17
Power [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | 0 |  | 0 | 2
Interest Expense | (24) | (30) | (66) | (94)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) | 0 | 0 | 0 | 0
Operating Revenues | 1,075 | 1,096 | 3,102 | 3,846
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion) | 0 | 0 | 0 | 17
Operating Revenues [Member] | Energy-Related Contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | 0 | 1 | 0 | 2
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion | 0 | 0 | 0 | 17
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) | 0 | 0 | 0 | 0
Operating Revenues [Member] | Power [Member] | Energy-Related Contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | 0 | 1 | 0 | 2
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion | 0 | 0 | 0 | 17
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) | 0 | 0 | 0 | 0
Interest Expense [Member] | Interest Rate Swap [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | 1 | 0 | 3 | 0
Interest Expense | 0 | 0 | 0 | 0
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) | $ 0 | $ 0 | $ 0 | $ 0

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- Definition The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and 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 (c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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