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Pension, OPEB and Savings Plans (Narrative) (Details) $ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020 USD ($) plan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jul. 01, 2019 USD ($) | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Number of PSEG's defined contribution plans | plan |  |  | 2 |  |  |  |
Defined benefit plan funded status of plan percentage |  |  | 85.00% |  |  |  |
Rabbi trust assets used to fund nonqualified pension plans |  |  | $ 266 |  |  |  |
Defined benefit plans, projected benefit and accumulated benefit obligations |  |  | $ 7,300 | $ 6,700 |  |  |
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 |  |  | $ 43 | 40 | $ 41 |  |
Pension Benefits [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  |  | 545 | 499 |  |  |
Accumulated Other Comprehensive Income (Loss), Defined Benefit Pension and Other Postretirement Plans, Before Tax |  |  | 760 | 695 |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  |  | $ (28) | $ 11 | $ (36) |  |
Discount Rate | 4.41% |  | 2.61% | 3.30% |  | 3.65% | 4.41%
Expected long-term rate of return on plan assets | 7.80% |  | 7.70% | 7.80% | 7.80% |  |
Defined benefit plans, projected benefit and accumulated benefit obligations |  |  |  |  |  | $ 6,400 |
Interest in Master Trust assets percentage |  |  | 92.00% |  |  |  |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment |  |  | $ 0 | $ 0 |  |  |
Other Pension Plan, Defined Benefit [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation |  |  | 182 |  |  |  |
Other Benefits [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  |  | $ (77) | $ (59) | $ 106 |  |
Discount Rate |  |  | 2.46% | 3.20% |  |  | 4.31%
Expected long-term rate of return on plan assets |  |  | 7.70% | 7.79% | 7.80% |  |
Interest in Master Trust assets percentage |  |  |  | 8.00% |  |  |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment |  |  | $ 4 | $ 0 |  |  |
Equity Securities [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target allocation percentage of assets |  |  | 59.00% |  |  |  |
Fixed Income Securities [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target allocation percentage of assets |  |  | 23.00% |  |  |  |
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 |  |  | $ 37 |  |  |  |
Maximum annual 401(k) contribution per employee, percent |  |  | 50.00% |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  |  | 50.00% |  |  |  |
Employer matching contribution, percent |  |  | 8.00% |  |  |  |
Total Employer Matching Contributions |  |  | $ 9 | 8 | $ 7 |  |
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) |  |  | $ 30 | $ 28 | $ 40 |  |
Discount Rate |  |  | 2.98% | 3.52% | 4.60% |  |
Expected long-term rate of return on plan assets |  |  | 7.60% |  |  |  |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment |  |  | $ 0 | $ 0 |  |  |
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) |  |  | $ 9 | $ 6 | $ 6 |  |
Discount Rate |  |  | 3.08% | 3.60% | 4.67% |  |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment |  |  | $ 0 | $ 3 |  |  |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Equity Securities [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target allocation percentage of assets |  |  | 60.00% |  |  |  |
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 |  |  | 25.00% |  |  |  |
Subsequent Event [Member] | Pension Benefits [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Expected long-term rate of return on plan assets |  | 7.70% |  |  |  |  |

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