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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |
Regulatory Liability for Excess Deferred Taxes adjustment | $ 35 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% | 35.00%
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 28 |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | $ 53 |  |
Bonus Depreciation For Tax Purposes |  | 50.00% |
NJ temporary surtax 2018 to 2019 | 2.50% | 2.50% |
NJ temporary surtax 2020 to 2021 | 1.50% | 1.50% |
Minimum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | $ 50 | $ 50 |
Maximum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | $ 120 | $ 120 |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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