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Pension, OPEB and Savings Plans (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 USD ($) plan | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Liability, Defined Benefit Plan, Noncurrent |  | $ 129 | $ 128 |
Number of PSEG's defined contribution plans | plan |  | 2 |  |
Defined benefit plan funded status of plan percentage |  | 91.00% |  |
Rabbi trust assets used to fund nonqualified pension plans |  | $ 231 |  |
Defined benefit plans, projected benefit and accumulated benefit obligations |  | 6,100 | 5,600 |
OPEB Plan estimated contribution in next fiscal year |  | $ 14 |  |
Maximum annual 401(k) contribution per employee, percent |  | 50.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  | 50.00% |  |
Total Employer Matching Contributions |  | $ 41 | 41 | $ 39
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  | 406 | 398 |
Accumulated Other Comprehensive Income (Loss), Defined Benefit Pension and Other Postretirement Plans, Before Tax |  | 683 | 679 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | 3 | 56 | $ 74
Liability, Defined Benefit Plan, Noncurrent |  | $ 537 | $ 568 |
Expected long-term rate of return on plan assets |  | 7.80% | 8.00% | 8.00%
Interest in Master Trust assets percentage |  | 92.00% |  |
Other Pension Plan, Defined Benefit [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation |  | $ 167 |  |
Other Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | 86 | $ 71 | $ 87
Liability, Defined Benefit Plan, Noncurrent |  | $ 1,455 | $ 1,324 |
Expected long-term rate of return on plan assets |  | 7.80% | 8.00% | 8.00%
Interest in Master Trust assets percentage |  |  | 8.00% |
Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation percentage of assets |  | 70.00% |  |
Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation percentage of assets |  | 30.00% |  |
Power [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Employer Matching Contributions |  | $ 11 | $ 12 | $ 12
Power [Member] | Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | 1 | 16 | 21
Power [Member] | Other Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | $ 27 | 23 | 27
Thrift Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer matching contribution, percent |  | 8.00% |  |
Savings Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer matching contribution, percent |  | 7.00% |  |
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 |  | $ 40 |  |
Maximum annual 401(k) contribution per employee, percent |  | 8.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  | 50.00% |  |
Employer matching contribution, percent |  | 50.00% |  |
Total Employer Matching Contributions |  | $ 6 | 5 | 4
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  |  | 28 | $ 30
Liability, Defined Benefit Plan, Noncurrent |  | $ 129 | 128 |
Expected long-term rate of return on plan assets |  | 7.60% |  |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | $ 4 | 2 |
Liability, Defined Benefit Plan, Noncurrent |  | $ 542 | $ 452 |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation percentage of assets |  | 70.00% |  |
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 |  | 30.00% |  |
Change in Accounting Method Accounted for as Change in Estimate [Member] | Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | $ 48 |  |
Subsequent Event [Member] | Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected long-term rate of return on plan assets | 7.80% |  |  |
Subsequent Event [Member] | Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected long-term rate of return on plan assets | 7.60% |  |  |

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