Debt and Credit Facilities (Changes in Long-Term Debt) (Detail) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Oct. 31, 2023	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Issuance of Long-term Debt		$ 1,800	$ 1,750
Repayments of Long-term Debt		825	0
Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt		1,800	500
Repayments of Long-term Debt		825	$ 0
Three Year Variable rate term loan | PSEG Power [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt		1,250
Medium Term Notes Green Bond Four Point Six Five Percent due Two Thousand Thirty Three | Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt		$ 500
Debt Instrument, Interest Rate, Stated Percentage		4.65%
Medium Term Notes Green Bond Five Point One Three Percent due Two Thousand Fifty Three | Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt		$ 400
Debt Instrument, Interest Rate, Stated Percentage		5.13%
Medium Term Notes Two Point Three Eight Percent Due In Two Thousand Twenty Three | Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.38%
Repayments of Long-term Debt		$ 500
Medium Term Notes Five Point Two Zero Percent due Two Thousand Thirty Three | Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt		$ 500
Debt Instrument, Interest Rate, Stated Percentage		5.20%
Medium Term Notes Five Point Four Five Percent due Two Thousand Fifty Three | Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt		$ 400
Debt Instrument, Interest Rate, Stated Percentage		5.45%
Medium Term Notes Three Point Two Five Percent due Two Thousand Twenty Three | Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.25%
Repayments of Long-term Debt		$ 325
Subsequent Event [Member] | Senior Notes Five Point Eight Seven Five Percent due Two Thousand Twenty Eight
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 600
Debt Instrument, Interest Rate, Stated Percentage	5.88%
Subsequent Event [Member] | Senior Notes Six Point One Two Five Percent due Two Thousand Thirty Three
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 400
Debt Instrument, Interest Rate, Stated Percentage	6.13%