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Pension, Other Postretirement Benefits (OPEB) and Savings Plans - Changes in Benefit Obligation and Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Assets at Beginning of Year [1]   $ 4,578    
Fair Value of Assets at End of Year [1]   4,394 $ 4,578  
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   433    
Fair Value of Assets at End of Year   490 433  
Pension Benefits [Member]        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit Obligation at Beginning of Year [2]   4,758 5,628  
Service Cost   94 90 $ 142
Interest Cost   225 259 167
Actuarial (Gain) Loss [3]   (291) 103  
Gross Benefits Paid   (309) (352)  
Settlements $ 1,000 0 (970)  
Other   0 0  
Benefit Obligation at End of Year [2]   4,477 4,758 5,628
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Assets at Beginning of Year   4,140 4,911  
Actual Return on Plan Assets   134 539  
Employer Contributions   13 12  
Gross Benefits Paid   (309) (352)  
Settlements   0 (970)  
Fair Value of Assets at End of Year   3,978 4,140 4,911
Funded Status (Plan Assets less Benefit Obligation)   (499) (618)  
Additional Amounts Recognized in the Consolidated Balance Sheets        
Current Accrued Benefit Cost   (11) (12)  
Noncurrent Accrued Benefit Cost   (488) (606)  
Amounts Recognized   (499) (618)  
Additional Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Regulated Assets, Deferred Assets and Deferred Liabilities        
Prior Service Cost (Credit) [4]   0 0  
Net Actuarial Loss (Gain) [4]   1,481 1,656  
Total [4]   1,481 1,656  
Pension Benefits [Member] | Long Island Electric Utility Servco LLC Pension and OPEB [Member]        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit Obligation at Beginning of Year [5]   535 452  
Service Cost   28 24  
Interest Cost   26 23  
Actuarial (Gain) Loss [6]   (54) 31  
Plan Assumptions   0 16  
Gross Benefits Paid   (14) (11)  
Benefit Obligation at End of Year [5]   521 535 452
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Assets at Beginning of Year   433 370  
Actual Return on Plan Assets   46 56  
Employer Contributions   25 18  
Gross Benefits Paid   (14) (11)  
Fair Value of Assets at End of Year   490 433 370
Funded Status (Plan Assets less Benefit Obligation)   (31) (102)  
Additional Amounts Recognized in the Consolidated Balance Sheets        
Noncurrent Accrued Benefit Cost   (31) (102)  
Amounts Recognized [7]   (31) (102)  
Other Benefits [Member]        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit Obligation at Beginning of Year [2]   802 851  
Service Cost   3 3 6
Interest Cost   37 41 26
Actuarial (Gain) Loss [3]   (39) (30)  
Gross Benefits Paid   (76) (68)  
Settlements   0 0  
Other   0 5  
Benefit Obligation at End of Year [2]   727 802 851
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Assets at Beginning of Year   440 429  
Actual Return on Plan Assets   18 51  
Employer Contributions   41 28  
Gross Benefits Paid   (76) (68)  
Settlements   0 0  
Fair Value of Assets at End of Year   423 440 429
Funded Status (Plan Assets less Benefit Obligation)   (304) (362)  
Additional Amounts Recognized in the Consolidated Balance Sheets        
Current Accrued Benefit Cost   (12) (13)  
Noncurrent Accrued Benefit Cost   (292) (349)  
Amounts Recognized   (304) (362)  
Additional Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Regulated Assets, Deferred Assets and Deferred Liabilities        
Prior Service Cost (Credit) [4]   4 6  
Net Actuarial Loss (Gain) [4]   (26) (6)  
Total [4]   (22) 0  
Other Benefits [Member] | Long Island Electric Utility Servco LLC Pension and OPEB [Member]        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit Obligation at Beginning of Year [5]   514 455  
Service Cost   14 12  
Interest Cost   25 24  
Actuarial (Gain) Loss [6]   (29) 35  
Plan Assumptions   0 0  
Gross Benefits Paid   (14) (12)  
Benefit Obligation at End of Year [5]   510 514 455
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   14 12  
Gross Benefits Paid   (14) (12)  
Fair Value of Assets at End of Year   0 0 $ 0
Funded Status (Plan Assets less Benefit Obligation)   (510) (514)  
Additional Amounts Recognized in the Consolidated Balance Sheets        
Noncurrent Accrued Benefit Cost   (510) (514)  
Amounts Recognized [7]   $ (510) $ (514)  
[1] Excludes net receivables of $6 million and $2 million as of December 31, 2024 and 2023, 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 $1 million as of December 31, 2024.
[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 and OPEB, the net actuarial gains in 2024 were due primarily to an increase in the discount rate, partially offset by actuarial losses driven by a lower than expected return on assets. For pension benefits, the net actuarial loss in 2023 was due primarily to a decrease in the discount rate. For OPEB, the net actuarial gain in 2023 was primarily due to assumption updates.
[4] Includes $107 million ($76 million, after-tax) and $143 million ($102 million, after-tax) in AOCL related to Pension and OPEB as of December 31, 2024 and 2023, respectively. Also includes Regulatory Assets of $1,227 million, Deferred Assets of $134 million and Deferred Liabilities of $9 million as of December 31, 2024 and Regulatory Assets of $1,427 million and Deferred Assets of $141 million as of December 31, 2023. The Regulatory Asset amounts do not include $103 million and $55 million as of December 31, 2024 and 2023, respectively, 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 benefits, the net actuarial gain in 2024 was due primarily to an increase in the discount rate. For OPEB, the net actuarial gain in 2024 was due primarily to an increase in the discount rate partially offset by other assumption updates. For pension benefits and OPEB, the net actuarial losses in 2023 were due primarily to a decrease in the discount rate and other assumption updates.
[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.