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v3.19.1

Income Taxes (Narrative) (Detail) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 | Dec. 31, 2017
Income Taxes [Line Items] |  |
Effective Income Tax Rate, Federal and State Statutory Income Tax Rate, Percent | 28.11% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00%
NJ surcharge tax percent for 2018 to 2019 | 2.50% |
NJ tax surcharge percent for 2020 to 2021 | 1.50% |
PSE And G [Member] |  |
Income Taxes [Line Items] |  |
Effective Income Tax Rate, Federal and State Statutory Income Tax Rate, Percent | 28.11% |
Power [Member] |  |
Income Taxes [Line Items] |  |
Effective Income Tax Rate, Federal and State Statutory Income Tax Rate, Percent | 28.11% |

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