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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 | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Assets at Beginning of Year | [1] | $ 6,449 |  |  |  |
Fair Value of Assets at End of Year | [1] | 6,921 |  | $ 6,449 |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |  |  |
Accrued Benefit Cost |  | (226) |  | (171) |  |
Pension Benefits [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Defined Benefit Pension and Other Postretirement Plans, Before Tax |  | 760 |  | 695 |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  | 545 |  | 499 |  |
Regulatory Assets |  | 1,489 |  | 1,284 |  |
Deferred Costs and Other Assets |  | 159 |  | 137 |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |  |  |
Benefit Obligation at Beginning of Year | [2] | 6,892 |  | 5,921 |  |
Service Cost |  | 141 |  | 123 |  | $ 130
Interest Cost |  | 192 |  | 218 |  | 208
Actuarial (Gain) Loss | [3] | 615 |  | 955 |  |
Gross Benefits Paid |  | (333) |  | (325) |  |
Plan Assumptions |  | 0 |  | 0 |  |
Benefit Obligation at End of Year | [2] | 7,507 |  | 6,892 |  | 5,921
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Assets at Beginning of Year |  | 5,929 |  | 5,120 |  |
Actual Return on Plan Assets |  | 761 |  | 1,122 |  |
Employer Contributions |  | 11 |  | 12 |  |
Gross Benefits Paid |  | (333) |  | (325) |  |
Fair Value of Assets at End of Year |  | 6,368 |  | 5,929 |  | 5,120
Funded Status (Plan Assets less Benefit Obligation) |  | (1,139) |  | (963) |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |  |  |
Current Accrued Benefit Cost |  | (11) |  | (11) |  |
Accrued Benefit Cost |  | (1,128) |  | (952) |  |
Amounts Recognized |  | (1,139) |  | (963) |  |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |  |  |
Prior Service Cost |  | 0 |  | (10) |  |
Net Actuarial Loss |  | 2,354 |  | 2,150 |  |
Total | [4] | (2,354) |  | (2,140) |  |
Other Benefits [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |  |  |
Benefit Obligation at Beginning of Year | [2] | 1,285 |  | 1,203 |  |
Service Cost |  | 9 |  | 10 |  | 18
Interest Cost |  | 34 |  | 45 |  | 66
Actuarial (Gain) Loss | [3] | 32 |  | 109 |  |
Gross Benefits Paid |  | (50) |  | (82) |  |
Plan Assumptions |  | (4) |  | 0 |  |
Benefit Obligation at End of Year | [2] | 1,306 |  | 1,285 |  | 1,203
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Assets at Beginning of Year |  | 540 |  | 488 |  |
Actual Return on Plan Assets |  | 70 |  | 107 |  |
Employer Contributions |  | 4 |  | 27 |  |
Gross Benefits Paid |  | (50) |  | (82) |  |
Fair Value of Assets at End of Year |  | 564 |  | 540 |  | 488
Funded Status (Plan Assets less Benefit Obligation) |  | (742) |  | (745) |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |  |  |
Current Accrued Benefit Cost |  | (12) |  | (11) |  |
Accrued Benefit Cost |  | (730) |  | (734) |  |
Amounts Recognized |  | (742) |  | (745) |  |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |  |  |
Prior Service Cost |  | (310) |  | (433) |  |
Net Actuarial Loss |  | 364 |  | 409 |  |
Total | [4] | (54) |  | 24 |  |
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 |  | 282 |  |  |  |
Fair Value of Assets at End of Year |  | 343 |  | 282 |  |
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 |  | 453 | [5] | 321 |  |
Service Cost |  | 33 |  | 26 |  |
Interest Cost |  | 14 |  | 14 |  |
Actuarial (Gain) Loss |  | 74 |  | 96 |  |
Gross Benefits Paid |  | (5) |  | (4) |  |
Plan Assumptions |  | 0 |  | 0 |  |
Benefit Obligation at End of Year |  | 569 | [5] | 453 | [5] | 321
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Assets at Beginning of Year |  | 282 |  | 212 |  |
Actual Return on Plan Assets |  | 36 |  | 46 |  |
Employer Contributions |  | 30 |  | 28 |  |
Gross Benefits Paid |  | (5) |  | (4) |  |
Fair Value of Assets at End of Year |  | 343 |  | 282 |  | 212
Funded Status (Plan Assets less Benefit Obligation) |  | (226) |  | (171) |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |  |  |
Accrued Benefit Cost |  | (226) |  | (171) |  |
Amounts Recognized | [6] | (226) |  | (171) |  |
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 |  | 626 | [5] | 501 |  |
Service Cost |  | 20 |  | 16 |  |
Interest Cost |  | 20 |  | 22 |  |
Actuarial (Gain) Loss |  | 42 |  | 96 |  |
Gross Benefits Paid |  | (9) |  | (6) |  |
Plan Assumptions |  | 0 |  | (3) |  |
Benefit Obligation at End of Year |  | 699 | [5] | 626 | [5] | 501
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 |  | 9 |  | 6 |  |
Gross Benefits Paid |  | (9) |  | (6) |  |
Fair Value of Assets at End of Year |  | 0 |  | 0 |  | $ 0
Funded Status (Plan Assets less Benefit Obligation) |  | (699) |  | (626) |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |  |  |
Accrued Benefit Cost |  | (699) |  | (626) |  |
Amounts Recognized | [6] | $ (699) |  | $ (626) |  |
[1] | Excludes net receivables of $10 million and $15 million as of December 31, 2020 and 2019, 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 and $5 million as of December 31, 2020 and 2019, respectively.
[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 was primarily due to a decrease in the discount rate. For OPEB, the net actuarial loss was primarily due to a decrease in the discount rate, partially offset by actuarial gains driven by lower than expected claims experience.
[4] | Includes $760 million ($545 million, after-tax) and $695 million ($499 million, after-tax) in Accumulated Other Comprehensive Loss related to Pension and OPEB as of December 31, 2020 and 2019, respectively. Also includes Regulatory Assets of $1,489 million and Deferred Assets of $159 million as of December 31, 2020 and Regulatory Assets of $1,284 million and Deferred Assets of $137 million as of December 31, 2019.
[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.(B)For pension benefits, the net actuarial loss was primarily due to a decrease in the discount rate. For OPEB, the net actuarial loss in 2020 was primarily due to a decrease in the discount rate, partially offset by actuarial gains driven by lower than expected participation experience. The OPEB net actuarial loss in 2019 was primarily due to a decrease in the discount rate.
[6] | 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, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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