Pension and Other Postretirement Benefits (OPEB) - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total benefit costs	$ 18	$ 17
Defined benefit plan, expected future employer contributions, next fiscal year	100
Pension Plan [Member] \| Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total benefit costs	12	11
Postretirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total benefit costs	1	1
Defined benefit plan, expected future employer contributions, current fiscal year	5
Postretirement Healthcare Plans [Member] \| Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total benefit costs	(1)	0
Long Island Electric Utility Servco LLC Pension and OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected future employer contributions, current fiscal year	23
Long Island Electric Utility Servco LLC Pension and OPEB [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total benefit costs	6	6
Long Island Electric Utility Servco LLC Pension and OPEB [Member] \| Postretirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total benefit costs	$ 3	$ 3

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Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year.

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Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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