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Pension, Other Postretirement Benefits (OPEB) and Savings Plans - Additional Information (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2025 | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) Retiree | Dec. 31, 2025 | Dec. 31, 2024 USD ($) Plan | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Number of PSEG's defined contribution plans | Plan |  |  |  |  | 2 |  |
Defined benefit plan funded status of plan percentage |  |  |  |  | 89.00% |  |
Rabbi trust fund |  | $ 179 |  |  | $ 165 | $ 179 |
Defined benefit plan funded status of plan qualified pension plan percentage |  |  |  |  | 92.00% |  |
Defined benefit plans, projected benefit and accumulated benefit obligations |  | 4,700 |  |  | $ 4,400 | 4,700 |
Pension Lift Out Settlement Charge |  | 6 | $ 332 |  |  |  |
Pension lift out settlement charge, net of tax |  | 4 | 239 |  |  | 239 |
Maximum annual 401(k) contribution per employee, percent |  |  |  |  | 50.00% |  |
Defined contribution plan, employer matching contribution, percent of match |  |  |  |  | 50.00% |  |
Employer matching contributions |  |  |  |  | $ 45 | 43 | $ 42
Subsequent Event |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Non-elective employer contributions | 4.00% |  |  |  |  |  |
Defined contribution plan, employer matching contribution, percent of match | 4.00% |  |  |  |  |  |
Employer matching contribution, percent | 100.00% |  |  |  |  |  |
Equity Securities [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target allocation percentage of assets |  |  |  |  | 54.00% |  |
Other Investments [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target allocation percentage of assets |  |  |  |  | 18.00% |  |
Real asset through equity securities percentage at year end |  |  |  |  | 0.13 |  |
Fixed Income Securities [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target allocation percentage of assets |  |  |  |  | 28.00% |  |
Public Service Electric and Gas Company [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Rabbi trust fund |  | $ 32 |  |  | $ 30 | 32 |
Employer matching contributions |  |  |  |  | 31 | 29 | 28
Pension Benefits [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Payment for Settlement |  |  | $ 1,000 |  | 0 | (970) |
Number of retirees | Retiree |  |  | 2,000 |  |  |  |
Total benefit costs |  |  |  |  | 69 | 409 | (115)
Pension Lift Out Settlement Charge |  |  |  |  | $ 0 | $ 338 | $ 0
Interest in Master Trust assets percentage |  |  |  |  | 90.00% |  |
Expected long-term rate of return on plan assets |  |  |  |  | 8.10% | 8.10% | 7.20%
Defined benefit plan, expected future employer contributions, next fiscal year |  |  |  |  | $ 100 |  |
Pension Benefits [Member] | Subsequent Event |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Expected long-term rate of return on plan assets |  |  |  | 8.10% |  |  |
Pension Benefits [Member] | Public Service Electric and Gas Company [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Total benefit costs |  |  |  |  | 43 | $ 50 | $ (70)
Other Pension Plan, Defined Benefit [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined benefit plan, benefit obligation |  |  |  |  | 132 |  |
Other Benefits [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Payment for Settlement |  |  |  |  | 0 | 0 |
Total benefit costs |  |  |  |  | 6 | (43) | (124)
Pension Lift Out Settlement Charge |  |  |  |  | $ 0 | $ 0 | $ 0
Interest in Master Trust assets percentage |  |  |  |  | 10.00% |  |
Expected long-term rate of return on plan assets |  |  |  |  | 8.10% | 8.10% | 7.20%
Defined benefit plan, expected future employer contributions, next fiscal year |  |  |  |  | $ 5 |  |
Other Benefits [Member] | Public Service Electric and Gas Company [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Total benefit costs |  |  |  |  | $ (2) | $ (42) | $ (109)
Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Number of PSEG's defined contribution plans | Plan |  |  |  |  | 2 |  |
Defined benefit plan, expected future employer contributions, next fiscal year |  |  |  |  | $ 23 |  |
Maximum annual 401(k) contribution per employee, percent |  |  |  |  | 50.00% |  |
Defined contribution plan, employer matching contribution, percent of match |  |  |  |  | 50.00% |  |
Employer matching contribution, percent |  |  |  |  | 8.00% |  |
Employer matching contributions |  |  |  |  | $ 13 | 10 | 9
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Equity Securities [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target allocation percentage of assets |  |  |  |  | 60.00% |  |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other Investments [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target allocation percentage of assets |  |  |  |  | 15.00% |  |
Real asset through equity securities percentage at year end |  |  |  |  | 0.15 |  |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Fixed Income Securities [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target allocation percentage of assets |  |  |  |  | 25.00% |  |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Total benefit costs |  |  |  |  | $ 25 | 18 | 30
Expected long-term rate of return on plan assets |  |  |  |  | 8.00% |  |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member] | Subsequent Event |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Expected long-term rate of return on plan assets |  |  |  | 8.00% |  |  |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other Benefits [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Total benefit costs |  |  |  |  | $ 14 | $ 12 | $ 10
Savings Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Employer matching contribution, percent |  |  |  |  | 7.00% |  |
Thrift Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Employer matching contribution, percent |  |  |  |  | 8.00% |  |

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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(10) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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