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Income Taxes (Interest And Penalties Related To Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |
Accumulated Interest and Penalties on Uncertain Tax Positions | $ 29 | $ 40 | $ 43
Public Service Electric and Gas Company |  |  |
Income Taxes [Line Items] |  |  |
Accumulated Interest and Penalties on Uncertain Tax Positions | 9 | 16 | 12
PSEG Power LLC |  |  |
Income Taxes [Line Items] |  |  |
Accumulated Interest and Penalties on Uncertain Tax Positions | 5 | 12 | 9
Energy Holdings [Member] |  |  |
Income Taxes [Line Items] |  |  |
Accumulated Interest and Penalties on Uncertain Tax Positions | $ 15 | $ 13 | $ 22

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- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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