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Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables) | 3 Months Ended
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Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income by Component |
| PSEG |  | Other Comprehensive Income (Loss) |
|  |  | Three Months Ended March 31, 2018 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2017 |  | $ | — |  |  | $ | (406 | ) |  | $ | 177 |  |  | $ | (229 | ) |
| Cumulative Effect Adjustment to Reclassify Unrealized Net Gains on Equity Investments to Retained Earnings |  | — |  |  | — |  |  | (176 | ) |  | (176 | ) |
| Current Period Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
| Other Comprehensive Income before Reclassifications |  | — |  |  | — |  |  | (16 | ) |  | (16 | ) |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 8 |  |  | 2 |  |  | 10 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | 8 |  |  | (14 | ) |  | (6 | ) |
| Net Change in Accumulative Other Comprehensive Income (Loss) |  | — |  |  | 8 |  |  | (190 | ) |  | (182 | ) |
| Balance as of March 31, 2018 |  | $ | — |  |  | $ | (398 | ) |  | $ | (13 | ) |  | $ | (411 | ) |
| PSEG |  | Other Comprehensive Income (Loss) |
|  |  | Three Months Ended March 31, 2017 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2016 |  | $ | 2 |  |  | $ | (398 | ) |  | $ | 133 |  |  | $ | (263 | ) |
| Other Comprehensive Income before Reclassifications |  | — |  |  | — |  |  | 30 |  |  | 30 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 6 |  |  | (15 | ) |  | (9 | ) |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | 6 |  |  | 15 |  |  | 21 |  |
| Balance as of March 31, 2017 |  | $ | 2 |  |  | $ | (392 | ) |  | $ | 148 |  |  | $ | (242 | ) |
| Power |  | Other Comprehensive Income (Loss) |
|  |  | Three Months Ended March 31, 2018 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2017 |  | $ | — |  |  | $ | (347 | ) |  | $ | 175 |  |  | $ | (172 | ) |
| Cumulative Effect Adjustment to Reclassify Unrealized Net Gains on Equity Investments to Retained Earnings |  | — |  |  | — |  |  | (175 | ) |  | (175 | ) |
| Current Period Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
| Other Comprehensive Income before Reclassifications |  | — |  |  | — |  |  | (13 | ) |  | (13 | ) |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 6 |  |  | 2 |  |  | 8 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | 6 |  |  | (11 | ) |  | (5 | ) |
| Net Change in Accumulative Other Comprehensive Income (Loss) |  | — |  |  | 6 |  |  | (186 | ) |  | (180 | ) |
| Balance as of March 31, 2018 |  | $ | — |  |  | $ | (341 | ) |  | $ | (11 | ) |  | $ | (352 | ) |
| Power |  | Other Comprehensive Income (Loss) |
|  |  | Three Months Ended March 31, 2017 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2016 |  | $ | — |  |  | $ | (340 | ) |  | $ | 129 |  |  | $ | (211 | ) |
| Other Comprehensive Income before Reclassifications |  | — |  |  | — |  |  | 28 |  |  | 28 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 5 |  |  | (9 | ) |  | (4 | ) |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | 5 |  |  | 19 |  |  | 24 |  |
| Balance as of March 31, 2017 |  | $ | — |  |  | $ | (335 | ) |  | $ | 148 |  |  | $ | (187 | ) |
Reclassifications out of Accumulated Other Comprehensive Income |
| PSEG |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Three Months Ended |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations |  | March 31, 2018 |
|  |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  | Millions |
| Pension and OPEB Plans |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) |  | (12 | ) |  | 3 |  |  | (9 | ) |
| Total Pension and OPEB Plans |  | (11 | ) |  | 3 |  |  | (8 | ) |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments |  | (4 | ) |  | 2 |  |  | (2 | ) |
| Total Available-for-Sale Debt Securities |  | (4 | ) |  | 2 |  |  | (2 | ) |
| Total |  |  |  | $ | (15 | ) |  | $ | 5 |  |  | $ | (10 | ) |
| PSEG |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Three Months Ended |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations |  | March 31, 2017 |
|  |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  |  | Millions |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) |  | $ | 2 |  |  | $ | (1 | ) |  | $ | 1 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) |  | (12 | ) |  | 5 |  |  | (7 | ) |
| Total Pension and OPEB Plans |  | (10 | ) |  | 4 |  |  | (6 | ) |
| Available-for-Sale Securities |  |  |  |  |  |  |
| Realized Gains (Losses) and OTTI |  | Net Gains (Losses) on Trust Investments |  | 28 |  |  | (13 | ) |  | 15 |  |
| Total Available-for-Sale Securities |  | 28 |  |  | (13 | ) |  | 15 |  |
| Total |  |  |  | $ | 18 |  |  | $ | (9 | ) |  | $ | 9 |  |
| Power |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Three Months Ended |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations |  | March 31, 2018 |
|  |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  |  | Millions |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) |  | (10 | ) |  | 3 |  |  | (7 | ) |
| Total Pension and OPEB Plans |  | (9 | ) |  | 3 |  |  | (6 | ) |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments |  | (4 | ) |  | 2 |  |  | (2 | ) |
| Total Available-for-Sale Debt Securities |  | (4 | ) |  | 2 |  |  | (2 | ) |
| Total |  |  |  | $ | (13 | ) |  | $ | 5 |  |  | $ | (8 | ) |
| Power |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Three Months Ended |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations |  | March 31, 2017 |
|  |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  |  | Millions |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) |  | $ | 2 |  |  | $ | (1 | ) |  | $ | 1 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) |  | (11 | ) |  | 5 |  |  | (6 | ) |
| Total Pension and OPEB Plans |  | (9 | ) |  | 4 |  |  | (5 | ) |
| Available-for-Sale Securities |  |  |  |  |  |  |
| Realized Gains (Losses) and OTTI |  | Net Gains (Losses) on Trust Investments |  | 19 |  |  | (10 | ) |  | 9 |  |
| Total Available-for-Sale Securities |  | 19 |  |  | (10 | ) |  | 9 |  |
| Total |  |  |  | $ | 10 |  |  | $ | (6 | ) |  | $ | 4 |  |

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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