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Commitments And Contingent Liabilities (Regulatory Proceedings and Superstorm Sandy) (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Loss Contingencies [Line Items] |  |  |
Clean Energy Program, current portion | $ 86 |  | $ 142
PSE And G [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Clean Energy Program, current portion | 86 |  | $ 142
Power [Member] | FERC Compliance [Domain] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency related to bidding errors |  | $ 25 |
Nuclear Electric Insurance Limited Ii Salem Hope Creek Peach Bottom [Member] | Total Site Coverage [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Property Damage Primary Layer | 1,500 |  |
Property Damage Excess Layers | 300 |  |
Nuclear Electric Insurance Limited Ii Salem Hope Creek Peach Bottom [Member] | Total Site Coverage for Non Nuclear Event [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Property Damage Excess Layers | 300 |  |
Nuclear Electric Insurance Limited I Peach Bottom [Member] | Total Site Coverage [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Property Damage Excess Layers | 300 |  |
Nuclear Electric Insurance Limited I Peach Bottom [Member] | Total Site Coverage for Non Nuclear Event [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Property Damage Excess Layers | $ 600 |  |

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- Definition The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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