Debt and Credit Facilities - Changes in Long-Term Debt - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 3,350	$ 1,800
Repayments of Long-term Debt	1,250	825
Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	2,100	1,800
Repayments of Long-term Debt	500	$ 825
Senior Notes Five Point Two Zero Due Two Thousand Twenty Nine [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 750
Debt Instrument, Interest Rate, Stated Percentage	5.20%
Senior Notes Five Point Four Five due Two Thousand Thirty Four [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 500
Debt Instrument, Interest Rate, Stated Percentage	5.45%
Senior Notes Two Point Eight Eight Percent due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.88%
Repayments of Long-term Debt	$ 750
Medium Term Notes Five Point Two Zero due Two Thousand Thirty Four [Member] | Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 450
Debt Instrument, Interest Rate, Stated Percentage	5.20%
Medium Term Notes Five Point Four Five Percent due Two Thousand Fifty Four [Member] | Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 550
Debt Instrument, Interest Rate, Stated Percentage	5.45%
Medium Term Notes Four Point Eight Five Percent due Two Thousand Thirty Four [Member] | Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 600
Debt Instrument, Interest Rate, Stated Percentage	4.85%
Medium Term Notes Five Point Three Zero Percent due Two Thousand Fifty Four [Member] | Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 500
Debt Instrument, Interest Rate, Stated Percentage	5.30%
Medium Term Notes Three Point Seven Five Percent due Two Thousand Twenty Four [Member] | Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.75%
Repayments of Long-term Debt	$ 250
Medium Term Notes Three Point One Five Percent due Two Thousand Twenty Four [Member] | Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.15%
Repayments of Long-term Debt	$ 250