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Financial Risk Management Activities (Schedule Of Reconciliation For Derivative Activity Included In Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in AOCI, After-Tax | $ 77 | $ (3) | $ (30)
Less: Gain Reclassified to Income, After-Tax | (43) | 35 | 18
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Derivative [Line Items] |  |  |
Balance as of Beginning of Year | 3 | 0 |
Gain (Loss) Recognized in AOCI, Pre-Tax | 0 | 3 |
Less: Gain Reclassified into Income, Pre-Tax | (3) | 0 | (20)
Balance as of End of Year | 0 | 3 | 0
Balance as of Beginning of Year | 2 | 0 |
Gain (Loss) Recognized in AOCI, After-Tax | 0 | 2 | 2
Less: Gain Reclassified to Income, After-Tax | (2) | 0 | (12)
Balance as of End of Year | $ 0 | $ 2 | $ 0

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- Definition Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Pre Tax + References No definition available. + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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