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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2020
Income Taxes [Line Items] |  |
Effective Income Tax Rate, Federal and State Statutory Income Tax Rate, Percent |  | 28.11%
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | $ 149 |
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount | 37 |
Public Service Electric and Gas Company [Member] |  |
Income Taxes [Line Items] |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 83 |
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount | 9 |
PSEG Power [Member] |  |
Income Taxes [Line Items] |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 63 |
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount | $ 25 |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to domestic income tax settlement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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