Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions	Mar. 31, 2020 USD ($)
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Total Available-for-Sale Debt Securities	$ 222
PSEG Power [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Total Available-for-Sale Debt Securities	1,091
Debt Securities [Member] \| Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Less than one year	3
1 - 5 years	27
6 - 10 years	33
11 - 15 years	14
16 - 20 years	23
Over 20 years	122
Debt Securities [Member] \| PSEG Power [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Less than one year	17
1 - 5 years	278
6 - 10 years	183
11 - 15 years	63
16 - 20 years	73
Over 20 years	$ 477

Available For Sale Securities Debt Maturities After Fifteen Through Twenty Years Fair Value

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