Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions	Jun. 30, 2020 USD ($)
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Total Available-for-Sale Debt Securities	$ 233
PSEG Power [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Total Available-for-Sale Debt Securities	1,133
Debt Securities [Member] \| Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Less than one year	1
1 - 5 years	32
6 - 10 years	32
11 - 15 years	16
16 - 20 years	32
Over 20 years	120
Debt Securities [Member] \| PSEG Power [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Less than one year	23
1 - 5 years	257
6 - 10 years	220
11 - 15 years	75
16 - 20 years	71
Over 20 years	$ 487

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

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