Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) - Debt Securities [Member] - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Available-for-sale debt securities, Less than one year	$ 3
Available-for-sale debt securities, 1-5 years	28
Available-for-sale debt securities, 6-10 years	33
Available-for-sale debt securities, 11-15 years	14
Available-for-sale debt securities, 16-20 years	28
Available-for-sale debt securities, Over 20 years	112
Total Available-for-Sale Debt Securities	218	$ 201
PSEG Power LLC \| Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Available-for-sale debt securities, Less than one year	19
Available-for-sale debt securities, 1-5 years	273
Available-for-sale debt securities, 6-10 years	188
Available-for-sale debt securities, 11-15 years	51
Available-for-sale debt securities, 16-20 years	77
Available-for-sale debt securities, Over 20 years	455
Total Available-for-Sale Debt Securities	$ 1,063	$ 978

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