Contractual interest rate for funds borrowed, under the debt agreement.

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Debt and Credit Facilities (Changes in Long-Term Debt) (Detail) - USD ($) $ in Millions	1 Months Ended		9 Months Ended
	Oct. 31, 2021	Aug. 31, 2021	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Issuance of Long-term Debt			$ 1,325	$ 2,450
Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt			1,325	$ 1,350
Medium Term Notes Zero Point Nine Five due Two Thousand Twenty Six \| Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt			$ 450
Debt Instrument, Interest Rate, Stated Percentage			0.95%
Medium Term Notes Three Point Zero due Two Thousand Fifty One \| Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt			$ 450
Debt Instrument, Interest Rate, Stated Percentage			3.00%
Medium Term Notes One Point Nine Zero Percent Due In Two Thousand Twenty One \| Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			1.90%
Repayments of Long-term Debt			$ 300
First And Refunding Mortgage Bonds Nine Point Two Five Percentage Due On Two Twenty One \| Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			9.25%
Repayments of Long-term Debt			$ 134
Senior Notes Four Point One Five Percentage Due Two Thousand Twenty One \| PSEG Power [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			3.00%
Repayments of Long-term Debt			$ 700
Senior Notes Three Point Zero Percent Due In Two Thousand Twenty One \| PSEG Power [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.15%
Repayments of Long-term Debt			$ 250
Pollution Control Notes Floating Rate Due On Two Thousand Fourteen \| PSEG Power [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt		$ 44
Senior Notes863 Due On2031 \| PSEG Power [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			8.63%
Senior Notes Three Point Eight Five Percent due Two Thousand Twenty Three \| PSEG Power [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			3.85%
Senior Notes Four Point Three Percent Due Two Thousand Twenty Three \| PSEG Power [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.30%
Medium Term Notes One Point Nine Zero due Two Thousand Thirty One \| Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt			$ 425
Debt Instrument, Interest Rate, Stated Percentage			1.90%
Subsequent Event [Member] \| PSEG Power [Member]
Debt Instrument [Line Items]
Payment for Debt Extinguishment or Debt Prepayment Cost	$ 294
Write off of Deferred Debt Issuance Cost	4
Subsequent Event [Member] \| Senior Notes863 Due On2031 \| PSEG Power [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	404
Subsequent Event [Member] \| Senior Notes Three Point Eight Five Percent due Two Thousand Twenty Three \| PSEG Power [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	700
Subsequent Event [Member] \| Senior Notes Four Point Three Percent Due Two Thousand Twenty Three \| PSEG Power [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 250