Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions	Sep. 30, 2019 USD ($)
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Less than one year	$ 4
1 - 5 years	30
6 - 10 years	33
11 - 15 years	12
16 - 20 years	27
Over 20 years	115
Total Available-for-Sale Debt Securities	221
PSEG Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Less than one year	26
1 - 5 years	267
6 - 10 years	192
11 - 15 years	55
16 - 20 years	74
Over 20 years	448
Total Available-for-Sale Debt Securities	$ 1,062