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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Assets at Beginning of Year | [1] | $ 5,599 |  |  |  |
Fair Value of Assets at End of Year | [1] | 6,310 |  | $ 5,599 |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |  |  |
Accrued Benefit Cost |  | (129) |  | (128) |  |
Pension Benefits [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Regulatory Assets |  | 1,485 |  | 1,396 |  |
Deferred Costs and Other Assets |  | 133 |  | 134 |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |  |  |
Benefit Obligation at Beginning of Year | [3] | 5,772 | [2] |  |  | $ 5,522
Service Cost |  | 114 |  | 109 |  | 123
Interest Cost |  | 204 |  | 202 |  | 234
Actuarial (Gain) Loss |  | 564 |  | 219 |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid |  | 295 |  | 282 |  |
Gross Benefits Paid |  | (295) |  | (282) |  |
Plan Assumptions |  | 0 |  | 2 |  |
Benefit Obligation at End of Year | [3] | 6,359 |  | 5,772 | [2] |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Assets at Beginning of Year |  | 5,193 |  |  |  | 5,039
Actual Return on Plan Assets |  | 903 |  | 403 |  |
Employer Contributions |  | 11 |  | 33 |  |
Fair Value of Assets at End of Year |  | 5,812 |  | 5,193 |  |
Funded Status (Plan Assets less Benefit Obligation) |  | (547) |  | (579) |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |  |  |
Current Accrued Benefit Cost |  | (10) |  | (11) |  |
Accrued Benefit Cost |  | (537) |  | (568) |  |
Amounts Recognized |  | (547) |  | (579) |  |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |  |  |
Prior Service Cost |  | (46) |  | (63) |  |
Net Actuarial Loss |  | 1,721 |  | 1,763 |  |
Total | [2] | (1,675) |  | (1,700) |  |
Other Benefits [Member] |  |  |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |  |  |
Benefit Obligation at Beginning of Year | [3] | 1,754 | [2] |  |  | 1,612
Service Cost |  | 17 |  | 17 |  | 22
Interest Cost |  | 63 |  | 59 |  | 67
Actuarial (Gain) Loss |  | 199 |  | 127 |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid |  | 57 |  | 57 |  |
Gross Benefits Paid |  | (57) |  | (57) |  |
Plan Assumptions |  | 0 |  | (4) |  |
Benefit Obligation at End of Year | [3] | 1,976 |  | 1,754 | [2] |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Assets at Beginning of Year |  | 420 |  |  |  | 374
Actual Return on Plan Assets |  | 77 |  | 32 |  |
Employer Contributions |  | 71 |  | 71 |  |
Fair Value of Assets at End of Year |  | 511 |  | 420 |  |
Funded Status (Plan Assets less Benefit Obligation) |  | (1,465) |  | (1,334) |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |  |  |
Current Accrued Benefit Cost |  | (10) |  | (10) |  |
Accrued Benefit Cost |  | (1,455) |  | (1,324) |  |
Amounts Recognized |  | (1,465) |  | (1,334) |  |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |  |  |
Prior Service Cost |  | (3) |  | (14) |  |
Net Actuarial Loss |  | 629 |  | 523 |  |
Total | [2] | (626) |  | (509) |  |
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 |  | 134 |  |  |  |
Fair Value of Assets at End of Year |  | 191 |  | 134 |  |
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 |  | 262 | [4] |  |  | 211
Service Cost |  | 27 |  | 24 |  |
Interest Cost |  | 11 |  | 9 |  |
Actuarial (Gain) Loss |  | 22 |  | 14 |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid |  | 2 |  | 1 |  |
Gross Benefits Paid |  | (2) |  | (1) |  |
Plan Assumptions |  | 0 |  | 5 |  |
Benefit Obligation at End of Year | [4] | 320 |  | 262 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair Value of Assets at Beginning of Year |  | 134 |  |  |  | 97
Actual Return on Plan Assets |  | 24 |  | 10 |  |
Employer Contributions |  | 35 |  | 28 |  |
Fair Value of Assets at End of Year |  | 191 |  | 134 |  |
Funded Status (Plan Assets less Benefit Obligation) |  | (129) |  | (128) |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |  |  |
Accrued Benefit Cost |  | (129) |  | (128) |  |
Amounts Recognized | [5] | (129) |  | (128) |  |
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 |  | 452 | [4] |  |  | 375
Service Cost |  | 15 |  | 12 |  |
Interest Cost |  | 19 |  | 17 |  |
Actuarial (Gain) Loss |  | 60 |  | 50 |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid |  | 4 |  | 2 |  |
Gross Benefits Paid |  | (4) |  | (2) |  |
Plan Assumptions |  | 0 |  | 0 |  |
Benefit Obligation at End of Year | [4] | 542 |  | 452 |  |
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 |  | 4 |  | 2 |  |
Fair Value of Assets at End of Year |  | 0 |  | 0 |  |
Funded Status (Plan Assets less Benefit Obligation) |  | (542) |  | (452) |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |  |  |
Accrued Benefit Cost |  | (542) |  | (452) |  |
Amounts Recognized | [5] | $ (542) |  | $ (452) |  |
[1] | Excludes net receivable of $13 million and $14 million at December 31, 2017 and 2016, respectively, which consists of interest, dividends and receivables and payables related to pending securities sales and purchases.
[2] | Includes $683 million ($406 million, after-tax) and $679 million ($398 million, after-tax) in Accumulated Other Comprehensive Loss related to Pension and OPEB as of December 31, 2017 and 2016, respectively. Also includes Regulatory Assets of $1,485 million and Deferred Assets of $133 million as of December 31, 2017 and Regulatory Assets of $1,396 million and Deferred Assets of $134 million as of December 31, 2016.
[3] | 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 of retirement.
[4] | 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 of retirement.
[5] | 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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