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Organization, Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Public Service Electric and Gas Company |  |
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |
Basis Adjustment | $ 986 | $ 986
PSEG Power LLC |  |
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |
Basis Adjustment | (986) | $ (986)
Inventory Write-down | $ 2 |

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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116847112&loc=d3e4542-108314 + Details
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