Commitments And Contingent Liabilities (Minimum Fuel Purchase Requirements) (Detail) - PSEG Power [Member] $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Long-term Purchase Commitment [Line Items]
Coverage percentage of nuclear fuel commitments of uranium, enrichment, and fabrication requirements for current year	100.00%
Nuclear Fuel Uranium [Member]
Long-term Purchase Commitment [Line Items]
Total five-year minimum purchase requirements	$ 216
Nuclear Fuel Enrichment [Member]
Long-term Purchase Commitment [Line Items]
Total five-year minimum purchase requirements	300
Nuclear Fuel Fabrication [Member]
Long-term Purchase Commitment [Line Items]
Total five-year minimum purchase requirements	169
Natural Gas [Member]
Long-term Purchase Commitment [Line Items]
Total five-year minimum purchase requirements	1,167	[1]
Long-term purchase commitment expected to be transferred	$ 31

[1] Approximately $31 million of commitments for natural gas are expected to be transferred with the sale of PSEG Power’s fossil generation portfolio