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Commitments And Contingent Liabilities (Regulatory Proceedings) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loss Contingencies [Line Items] |  |  |  |
Costs recognized in Operation and Maintenance Expense |  | $ 2,869 | $ 3,008 | $ 2,978
Insured Event, Gain (Loss) |  |  |  | 28
PSE&G [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Costs recognized in Operation and Maintenance Expense |  | 1,434 | 1,475 | 1,560
Insured Event, Gain (Loss) |  |  |  | 0
Power [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Costs recognized in Operation and Maintenance Expense |  | 1,038 | $ 1,143 | 1,057
Insured Event, Gain (Loss) |  |  |  | $ 28
Power [Member] | Regulatory Agency [Domain] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Loss in Period | $ 25 | 10 |  |
Maximum [Member] | Power [Member] | Regulatory Agency [Domain] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 135 |  |
Minimum [Member] | Power [Member] | Regulatory Agency [Domain] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 35 |  |

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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 + Details
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- Definition Amount of operating expense for routine plant maintenance, repairs and operations of regulated operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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