Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions	Jun. 30, 2019 USD ($)
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Less than one year	$ 1
1 - 5 years	33
6 - 10 years	29
11 - 15 years	11
16 - 20 years	27
Over 20 years	113
Total Available-for-Sale Debt Securities	214
PSEG Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Less than one year	23
1 - 5 years	272
6 - 10 years	208
11 - 15 years	47
16 - 20 years	76
Over 20 years	427
Total Available-for-Sale Debt Securities	$ 1,053