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Financial Risk Management Activities (Schedule Of Reconciliation For Derivative Activity Included In Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Gain (Loss) in AOCI | $ 25 | $ 27 | $ 78 | $ 46 |
(Gain) Loss into Income | (3) | 7 | (19) | 31 |
Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Pre-Tax Balance at Beginning of Period |  |  | 3 | 0 | $ 0
Gain (Loss) in AOCI |  |  | 1 |  | 3
(Gain) Loss into Income | (2) |  | (2) |  | 0
Pre-Tax Balance at End of Period | 2 |  | 2 |  | 3
After-Tax Balance at Beginning of Period |  |  | 2 | 0 | 0
Gain (Loss) in AOCI | 0 | 1 | 0 | 2 | 2
(Gain) Loss into Income | (1) | $ 0 | (1) | $ 0 | 0
After-Tax Balance at End of Period | $ 1 |  | $ 1 |  | $ 2

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- Definition Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect After Tax + References No definition available. + Details
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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=66004921&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=66004124&loc=SL7669686-108580 + Details
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