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Pension, OPEB and Savings Plans (Changes In The Benefit Obligation And The Fair Value Of Plan Assets) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Deferred Costs and Other Assets |  |  | $ 9,337 | $ 8,473 |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair Value of Assets at Beginning of Year | [1] |  | 5,331 |  |
Fair Value of Assets at End of Year | [1] |  | 4,578 | 5,331 |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |  |
Regulatory Assets |  |  | (5,157) | (4,404) |
Public Service Electric and Gas Company |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Regulatory Assets |  |  | 5,430 | 4,773 |
Deferred Costs and Other Assets |  |  | 5,601 | 4,798 |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |  |
Regulatory Assets |  |  | (5,157) | (4,404) |
Pension Ratemaking deferral | Public Service Electric and Gas Company |  |  |  |  |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |  |
Regulatory Assets |  |  | (55) |  |
Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Defined Benefit Pension and Other Postretirement Plans, Before Tax |  |  | 143 | 594 |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  |  | 102 | 426 |
Regulatory Assets |  |  | 1,427 | 1,405 |
Deferred Costs and Other Assets |  |  | 141 | 141 |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |  |
Benefit Obligation at Beginning of Year | [2] |  | 5,628 | 7,240 |
Service Cost |  |  | 90 | 142 | $ 151
Interest Cost |  |  | 259 | 167 | 140
Actuarial (Gain) Loss | [3] |  | 103 | (1,517) |
Gross Benefits Paid |  |  | (352) | (382) |
Defined Benefit Plan, Benefit Obligation, Payment for Settlement |  | $ 1,000 | (970) | 0 |
Defined Benefit Plan, Benefit Obligation, Other |  |  | 0 | 22 |
Benefit Obligation at End of Year | [2] |  | 4,758 | 5,628 | 7,240
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair Value of Assets at Beginning of Year |  |  | 4,911 | 6,906 |
Actual Return on Plan Assets |  |  | 539 | (1,606) |
Employer Contributions |  |  | 12 | 11 |
Gross Benefits Paid |  |  | (352) | (382) |
Defined Benefit Plan, Plan Assets, Payment for Settlement |  |  | (970) | 0 |
Defined Benefit Plan, Plan Assets, Other |  |  | 0 | 18 |
Fair Value of Assets at End of Year |  |  | 4,140 | 4,911 | 6,906
Funded Status (Plan Assets less Benefit Obligation) |  |  | (618) | (717) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |  |
Current Accrued Benefit Cost |  |  | (12) | (12) |
Accrued Benefit Cost |  |  | (606) | (705) |
Amounts Recognized |  |  | (618) | (717) |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |  |
Prior Service Cost |  |  | 0 | 0 |
Net Actuarial Loss |  |  | 1,656 | 2,151 |
Total | [4] |  | (1,656) | (2,151) |
Other Benefits [Member] |  |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |  |
Benefit Obligation at Beginning of Year | [2] |  | 851 | 1,197 |
Service Cost |  |  | 3 | 6 | 9
Interest Cost |  |  | 41 | 26 | 22
Actuarial (Gain) Loss | [3] |  | (30) | (314) |
Gross Benefits Paid |  |  | (68) | (61) |
Defined Benefit Plan, Benefit Obligation, Payment for Settlement |  |  | 0 | 0 |
Defined Benefit Plan, Benefit Obligation, Other |  |  | (5) | 3 |
Benefit Obligation at End of Year | [2] |  | 802 | 851 | 1,197
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair Value of Assets at Beginning of Year |  |  | 429 | 606 |
Actual Return on Plan Assets |  |  | 51 | (139) |
Employer Contributions |  |  | 28 | 23 |
Gross Benefits Paid |  |  | (68) | (61) |
Defined Benefit Plan, Plan Assets, Payment for Settlement |  |  | 0 | 0 |
Defined Benefit Plan, Plan Assets, Other |  |  | 0 | 0 |
Fair Value of Assets at End of Year |  |  | 440 | 429 | 606
Funded Status (Plan Assets less Benefit Obligation) |  |  | (362) | (422) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |  |
Current Accrued Benefit Cost |  |  | (13) | (12) |
Accrued Benefit Cost |  |  | (349) | (410) |
Amounts Recognized |  |  | (362) | (422) |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |  |
Prior Service Cost |  |  | 6 | (52) |
Net Actuarial Loss |  |  | (6) | 41 |
Total | [4] |  | 0 | 11 |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair Value of Assets at Beginning of Year |  |  | 370 |  |
Fair Value of Assets at End of Year |  |  | 433 | 370 |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |  |
Benefit Obligation at Beginning of Year | [5] |  | 452 | 596 |
Service Cost |  |  | 24 | 38 |
Interest Cost |  |  | 23 | 17 |
Actuarial (Gain) Loss | [6] |  | 31 | (189) |
Plan Assumptions |  |  | 16 | 0 |
Gross Benefits Paid |  |  | (11) | (10) |
Benefit Obligation at End of Year | [5] |  | 535 | 452 | 596
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair Value of Assets at Beginning of Year |  |  | 370 | 422 |
Actual Return on Plan Assets |  |  | 56 | (72) |
Employer Contributions |  |  | 18 | 30 |
Gross Benefits Paid |  |  | (11) | (10) |
Fair Value of Assets at End of Year |  |  | 433 | 370 | 422
Funded Status (Plan Assets less Benefit Obligation) |  |  | (102) | (82) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |  |
Accrued Benefit Cost |  |  | (102) | (82) |
Amounts Recognized | [7] |  | (102) | (82) |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other Benefits [Member] |  |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |  |
Benefit Obligation at Beginning of Year | [5] |  | 455 | 640 |
Service Cost |  |  | 12 | 21 |
Interest Cost |  |  | 24 | 19 |
Actuarial (Gain) Loss | [6] |  | 35 | (215) |
Plan Assumptions |  |  | 0 | 0 |
Gross Benefits Paid |  |  | (12) | (10) |
Benefit Obligation at End of Year | [5] |  | 514 | 455 | 640
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair Value of Assets at Beginning of Year |  |  | 0 | 0 |
Actual Return on Plan Assets |  |  | 0 | 0 |
Employer Contributions |  |  | 12 | 10 |
Gross Benefits Paid |  |  | (12) | (10) |
Fair Value of Assets at End of Year |  |  | 0 | 0 | $ 0
Funded Status (Plan Assets less Benefit Obligation) |  |  | (514) | (455) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |  |
Accrued Benefit Cost |  |  | (514) | (455) |
Amounts Recognized | [7] |  | $ (514) | $ (455) |
[1] | Excludes net receivables of $2 million and $7 million as of December 31, 2023 and 2022, respectively, which consist of interest, dividends and receivables and payables related to pending securities sales and purchases. In addition, the table excludes cash and foreign currency of $2 million as of December 31, 2022.
[2] | Represents projected benefit obligation for pension benefits and the accumulated postretirement benefit obligation for other benefits. The vested benefit obligation is the actuarial present value of the vested benefits to which the employee is currently entitled but based on the employee’s expected date of separation or retirement.
[3] | For pension benefits, the net actuarial loss in 2023 was due primarily to a decrease in the discount rate. The net actuarial gain in 2022 was due primarily to an increase in the discount rate. For OPEB, the net actuarial gain in 2023 was due primarily to assumption updates. The net actuarial gain in 2022 was due primarily to an increase in the discount rate and other assumption updates.
[4] | Includes $143 million ($102 million, after-tax) and $594 million ($426 million, after-tax) in Accumulated Other Comprehensive Loss related to Pension and OPEB as of December 31, 2023 and 2022, respectively. Also includes Regulatory Assets of $1,427 million and Deferred Assets of $141 million as of December 31, 2023 and Regulatory Assets of $1,405 million and Deferred Assets of $141 million as of December 31, 2022. This amount does not include $55 million as a result of modifying the method for calculating pension expense for ratemaking purposes, approved by the BPU effective January 1, 2023.
[5] | Represents projected benefit obligation for pension benefits and the accumulated postretirement benefit obligation for other benefits. The vested benefit obligation is the actuarial present value of the vested benefits to which the employee is currently entitled but based on the employee’s expected date of separation or retirement.
[6] | For pension and OPEB benefits, the net actuarial losses in 2023 were due primarily to a decrease in the discount rate and other assumption updates. For pension benefits and OPEB, the net actuarial gains in 2022 were due primarily to an increase in the discount rate.
[7] | Amounts equal to the accrued pension and OPEB costs of Servco are offset in Long-Term Receivable of VIE on PSEG’s Consolidated Balance Sheets.

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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i-k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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