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Pension, OPEB and Savings Plans (Schedule Of Pension And OPEB Costs) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ (28) | $ 11 | $ (36)
Total Benefit Costs | (28) | 11 | (36)
Pension Benefits [Member] | Public Service Electric and Gas Company |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (27) | 0 | (31)
Pension Benefits [Member] | PSEG Power LLC |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (5) | 4 | (9)
Pension Benefits [Member] | Other [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 4 | 7 | 4
Other Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (77) | (59) | 106
Total Benefit Costs | (77) | (59) | 106
Other Benefits [Member] | Public Service Electric and Gas Company |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (76) | (62) | 68
Other Benefits [Member] | PSEG Power LLC |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 0 | 3 | 32
Other Benefits [Member] | Other [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ (1) | $ 0 | $ 6

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