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Pension And OPEB (Schedule Of Pension And OPEB Costs) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | $ (7) | $ 12
Pension Benefits [Member] | Public Service Electric and Gas Company [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | (7) | 7
Pension Benefits [Member] | PSEG Power [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | (1) | 3
Pension Benefits [Member] | Other Entity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | 1 | 2
OPEB [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | (19) | (15)
OPEB [Member] | Public Service Electric and Gas Company [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | (19) | (16)
OPEB [Member] | PSEG Power [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | 0 | 1
OPEB [Member] | Other Entity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | $ 0 | $ 0

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