Commitments And Contingent Liabilities (Minimum Fuel Purchase Requirements) (Detail) - PSEG Power LLC $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Long-term Purchase Commitment [Line Items]
Coverage percentage of nuclear fuel commitments of uranium, enrichment, and fabrication requirements	100.00%
Nuclear Fuel [Member]
Long-term Purchase Commitment [Line Items]
Total minimum purchase requirements	$ 193
Nuclear Fuel Enrichment [Member]
Long-term Purchase Commitment [Line Items]
Total minimum purchase requirements	346
Nuclear Fuel Fabrication [Member]
Long-term Purchase Commitment [Line Items]
Total minimum purchase requirements	174
Natural Gas [Member]
Long-term Purchase Commitment [Line Items]
Total minimum purchase requirements	$ 1,256