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Pension, OPEB and Savings Plans (Narrative) (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2017 | Dec. 31, 2016 USD ($) plan | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent |  | $ 128 | $ 114 |
Number of PSEG's defined contribution plans | plan |  | 2 |  |
Historical annualized rate of return |  | 9.30% |  |
Defined benefit plan funded status of plan percentage |  | 90.00% |  |
Rabbi trust assets used to fund nonqualified pension plans |  | $ 217 |  |
Defined benefit plans, projected benefit and accumulated benefit obligations |  | 5,600 | 5,400 |
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 | 39 | $ 36
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax |  | 398 | 386 |
Accumulated Other Comprehensive Income (Loss), Defined Benefit Pension and Other Postretirement Plans, Before Tax |  | 679 | 658 |
Defined Benefit Plan, Net Periodic Benefit Cost |  | 56 | 74 | $ (23)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent |  | $ 568 | $ 487 |
Expected long-term rate of return on plan assets |  | 8.00% | 8.00% | 8.00%
Interest in Master Trust assets percentage |  | 93.00% |  |
Other Pension Plan, Defined Benefit [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation |  | $ 161 |  |
Other Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  | 71 | $ 87 | $ 70
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent |  | $ 1,324 | $ 1,228 |
Expected long-term rate of return on plan assets |  | 8.00% | 8.00% | 8.00%
Interest in Master Trust assets percentage |  |  | 7.00% |
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 |  | $ 12 | $ 12 | $ 11
Power [Member] | Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  | 16 | 21 | (7)
Power [Member] | Other Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  | $ 23 | 27 | 20
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 Plans, Estimated Future Employer Contributions in Next Fiscal Year |  | $ 35 |  |
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 |  | $ 5 | 4 | 3
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 |  | 28 | 30 | $ 67
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent |  | $ 128 | 114 |
Expected long-term rate of return on plan assets |  | 7.70% |  |
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 |  | $ 2 |  |
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent |  | $ 452 | $ 375 |
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 |  | $ 34 |  |
Change in Accounting Method Accounted for as Change in Estimate [Member] | Other Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  | $ 13 |  |
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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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=73719040&loc=d3e4179-114921 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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