Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions	Sep. 30, 2021 USD ($)
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Total Available-for-Sale Debt Securities	$ 216
PSEG Power [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Total Available-for-Sale Debt Securities	1,337
Debt Securities [Member] \| Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Less than one year	0
1 - 5 years	42
6 - 10 years	25
11 - 15 years	10
16 - 20 years	24
Over 20 years	115
Debt Securities [Member] \| PSEG Power [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Less than one year	22
1 - 5 years	352
6 - 10 years	231
11 - 15 years	81
16 - 20 years	91
Over 20 years	$ 560

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

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