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Valuation And Qualifying Accounts (Schedule Of Valuation And Qualifying Accounts) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance For Doubtful Accounts [Member] |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at Beginning of Period |  | $ 60 |  | $ 63 |  | $ 59
Additions, Charged to cost and expenses | [1] | 175 |  | 87 |  | 91
Additions, Charged to other accounts-describe |  | 0 |  | 0 |  | 0
Deductions-describe | [2] | 37 |  | 90 |  | 87
Balance at End of Period |  | 206 |  | 60 |  | 63
Allowance For Doubtful Accounts [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at Beginning of Period | [3] | 68 |  |  |  |
Balance at End of Period | [3] |  |  | 68 |  |
Materials And Supplies Valuation Reserve [Member] |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at Beginning of Period |  | 11 |  | 9 |  | 7
Additions, Charged to cost and expenses |  | 1 |  | 3 |  | 4
Additions, Charged to other accounts-describe |  | 0 |  | 0 |  | 0
Deductions-describe |  | 2 | [4] | 1 | [4] | 2
Balance at End of Period |  | 10 |  | 11 |  | 9
Public Service Electric and Gas Company | Allowance For Doubtful Accounts [Member] |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at Beginning of Period |  | 60 |  | 63 |  | 59
Additions, Charged to cost and expenses | [5] | 175 |  | 87 |  | 91
Additions, Charged to other accounts-describe |  | 0 |  | 0 |  | 0
Deductions-describe | [6] | 37 |  | 90 |  | 87
Balance at End of Period |  | 206 |  | 60 |  | 63
Public Service Electric and Gas Company | Allowance For Doubtful Accounts [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at Beginning of Period | [7] | 68 |  |  |  |
Balance at End of Period | [7] |  |  | 68 |  |
Public Service Electric and Gas Company | Materials And Supplies Valuation Reserve [Member] |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at Beginning of Period |  | 2 |  | 2 |  | 0
Additions, Charged to cost and expenses |  | 0 |  | 0 |  | 2
Additions, Charged to other accounts-describe |  | 0 |  | 0 |  | 0
Deductions-describe |  | 0 |  | 0 |  | 0
Balance at End of Period |  | 2 |  | 2 |  | 2
PSEG Power LLC | Materials And Supplies Valuation Reserve [Member] |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at Beginning of Period |  | 9 |  | 7 |  | 7
Additions, Charged to cost and expenses |  | 1 |  | 3 |  | 2
Additions, Charged to other accounts-describe |  | 0 |  | 0 |  | 0
Deductions-describe | [8] | 2 |  | 1 |  | 2
Balance at End of Period |  | $ 8 |  | $ 9 |  | $ 7
[1] | For a discussion of bad debt recoveries, see Note 1. Organization, Basis of Presentation and Summary of Significant Accounting Policies.
[2] | Accounts Receivable written off.
[3] | Includes $8 million due to the adoption of ASU 2016-13.
[4] | Reduce reserve to appropriate level and to remove obsolete inventory.
[5] | For a discussion of bad debt recoveries, see Note 1. Organization, Basis of Presentation and Summary of Significant Accounting Policies.
[6] | Accounts Receivable written off.
[7] | Includes $8 million due to the adoption of ASU 2016-13.
[8] | Reduce reserve to appropriate level and to remove obsolete inventory.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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