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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in AOCI, After-Tax | $ (30) | $ (135) | $ 299
Less: Gain Reclassified to Income, After-Tax | 18 | (53) | (6)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Derivative [Line Items] |  |  |
Balance as of Beginning of Year | 17 | (4) |
Gain (Loss) Recognized in AOCI, Pre-Tax | 3 | 12 |
Less: Gain Reclassified into Income, Pre-Tax | (20) | 9 | (12)
Balance as of End of Year | 0 | 17 | (4)
Balance as of Beginning of Year | 10 | (2) |
Gain (Loss) Recognized in AOCI, After-Tax | 2 | 7 | (2)
Less: Gain Reclassified to Income, After-Tax | (12) | 5 | (7)
Balance as of End of Year | $ 0 | $ 10 | $ (2)

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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=51821188&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=36458714&loc=SL7669686-108580 + Details
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