Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions	Jun. 30, 2021 USD ($)
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Total Available-for-Sale Debt Securities	$ 218
PSEG Power [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Total Available-for-Sale Debt Securities	1,347
Debt Securities [Member] \| Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Less than one year	0
1 - 5 years	43
6 - 10 years	22
11 - 15 years	11
16 - 20 years	28
Over 20 years	114
Debt Securities [Member] \| PSEG Power [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Less than one year	35
1 - 5 years	344
6 - 10 years	252
11 - 15 years	86
16 - 20 years	97
Over 20 years	$ 533

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

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