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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.