Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) - Debt Securities [Member] - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Available-for-sale debt securities, Less than one year	$ 5
Available-for-sale debt securities, 1-5 years	39
Available-for-sale debt securities, 6-10 years	30
Available-for-sale debt securities, 11-15 years	12
Available-for-sale debt securities, 16-20 years	30
Available-for-sale debt securities, Over 20 years	119
Total Available-for-Sale Debt Securities	235	$ 218
PSEG Power LLC \| Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Available-for-sale debt securities, Less than one year	20
Available-for-sale debt securities, 1-5 years	301
Available-for-sale debt securities, 6-10 years	202
Available-for-sale debt securities, 11-15 years	81
Available-for-sale debt securities, 16-20 years	79
Available-for-sale debt securities, Over 20 years	464
Total Available-for-Sale Debt Securities	$ 1,147	$ 1,063

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

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