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Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables) | 3 Months Ended
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Mar. 31, 2015
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, 2015 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2014 |  | $ | 10 |  |  | $ | (411 | ) |  | $ | 118 |  |  | $ | (283 | ) |
| Other Comprehensive Income before Reclassifications |  | 1 |  |  | — |  |  | 16 |  |  | 17 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (10 | ) |  | 8 |  |  | (2 | ) |  | (4 | ) |
| Net Current Period Other Comprehensive Income (Loss) |  | (9 | ) |  | 8 |  |  | 14 |  |  | 13 |  |
| Balance as of March 31, 2015 |  | $ | 1 |  |  | $ | (403 | ) |  | $ | 132 |  |  | $ | (270 | ) |
| PSEG |  | Other Comprehensive Income (Loss) |
|  |  | Three Months Ended March 31, 2014 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2013 |  | $ | (2 | ) |  | $ | (238 | ) |  | $ | 145 |  |  | $ | (95 | ) |
| Other Comprehensive Income before Reclassifications |  | (5 | ) |  | — |  |  | 11 |  |  | 6 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 7 |  |  | 4 |  |  | (9 | ) |  | 2 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | 2 |  |  | 4 |  |  | 2 |  |  | 8 |  |
| Balance as of March 31, 2014 |  | $ | — |  |  | $ | (234 | ) |  | $ | 147 |  |  | $ | (87 | ) |
| Power |  | Other Comprehensive Income (Loss) |
|  |  | Three Months Ended March 31, 2015 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2014 |  | $ | 11 |  |  | $ | (351 | ) |  | $ | 112 |  |  | $ | (228 | ) |
| Other Comprehensive Income before Reclassifications |  | 1 |  |  | — |  |  | 16 |  |  | 17 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (10 | ) |  | 7 |  |  | (2 | ) |  | (5 | ) |
| Net Current Period Other Comprehensive Income (Loss) |  | (9 | ) |  | 7 |  |  | 14 |  |  | 12 |  |
| Balance as of March 31, 2015 |  | $ | 2 |  |  | $ | (344 | ) |  | $ | 126 |  |  | $ | (216 | ) |
| Power |  | Other Comprehensive Income (Loss) |
|  |  | Three Months Ended March 31, 2014 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2013 |  | $ | (1 | ) |  | $ | (204 | ) |  | $ | 142 |  |  | $ | (63 | ) |
| Other Comprehensive Income before Reclassifications |  | (6 | ) |  | — |  |  | 10 |  |  | 4 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 7 |  |  | 3 |  |  | (8 | ) |  | 2 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | 1 |  |  | 3 |  |  | 2 |  |  | 6 |  |
| Balance as of March 31, 2014 |  | $ | — |  |  | $ | (201 | ) |  | $ | 144 |  |  | $ | (57 | ) |
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, 2015 |
|  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | Operating Revenues | $ | 17 |  |  | $ | (7 | ) |  | $ | 10 |  |
| Total Cash Flow Hedges |  |  | 17 |  |  | (7 | ) |  | 10 |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | O&M Expense | 3 |  |  | (1 | ) |  | 2 |  |
| Amortization of Actuarial Loss |  | O&M Expense | (17 | ) |  | 7 |  |  | (10 | ) |
| Total Pension and OPEB Plans | (14 | ) |  | 6 |  |  | (8 | ) |
| Available-for-Sale Securities |  |  |  |  |  |
| Realized Gains |  | Other Income | 19 |  |  | (10 | ) |  | 9 |  |
| Realized Losses |  | Other Deductions | (9 | ) |  | 5 |  |  | (4 | ) |
| Other-Than-Temporary Impairments (OTTI) |  | OTTI | (5 | ) |  | 2 |  |  | (3 | ) |
| Total Available-for-Sale Securities | 5 |  |  | (3 | ) |  | 2 |  |
| Total |  |  | $ | 8 |  |  | $ | (4 | ) |  | $ | 4 |  |
| 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, 2014 |
|  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | Operating Revenues | $ | (12 | ) |  | $ | 5 |  |  | $ | (7 | ) |
| Total Cash Flow Hedges |  |  | (12 | ) |  | 5 |  |  | (7 | ) |
| Pension and OPEB Plans |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | O&M Expense | 2 |  |  | (1 | ) |  | 1 |  |
| Amortization of Actuarial Loss |  | O&M Expense | (8 | ) |  | 3 |  |  | (5 | ) |
| Total Pension and OPEB Plans | (6 | ) |  | 2 |  |  | (4 | ) |
| Available-for-Sale Securities |  |  |  |  |  |
| Realized Gains |  | Other Income | 25 |  |  | (13 | ) |  | 12 |  |
| Realized Losses |  | Other Deductions | (4 | ) |  | 2 |  |  | (2 | ) |
| OTTI |  | OTTI | (2 | ) |  | 1 |  |  | (1 | ) |
| Total Available-for-Sale Securities | 19 |  |  | (10 | ) |  | 9 |  |
| Total |  |  | $ | 1 |  |  | $ | (3 | ) |  | $ | (2 | ) |
| 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, 2015 |
|  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | Operating Revenues | $ | 17 |  |  | $ | (7 | ) |  | $ | 10 |  |
| Total Cash Flow Hedges |  |  | 17 |  |  | (7 | ) |  | 10 |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | O&M Expense | 3 |  |  | (1 | ) |  | 2 |  |
| Amortization of Actuarial Loss |  | O&M Expense | (15 | ) |  | 6 |  |  | (9 | ) |
| Total Pension and OPEB Plans | (12 | ) |  | 5 |  |  | (7 | ) |
| Available-for-Sale Securities |  |  |  |  |  |
| Realized Gains |  | Other Income | 19 |  |  | (10 | ) |  | 9 |  |
| Realized Losses |  | Other Deductions | (9 | ) |  | 5 |  |  | (4 | ) |
| OTTI |  | OTTI | (5 | ) |  | 2 |  |  | (3 | ) |
| Total Available-for-Sale Securities | 5 |  |  | (3 | ) |  | 2 |  |
| Total |  |  | $ | 10 |  |  | $ | (5 | ) |  | $ | 5 |  |
| 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, 2014 |
|  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | Operating Revenues | $ | (12 | ) |  | $ | 5 |  |  | $ | (7 | ) |
| Total Cash Flow Hedges |  |  | (12 | ) |  | 5 |  |  | (7 | ) |
| Pension and OPEB Plans |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | O&M Expense | 2 |  |  | (1 | ) |  | 1 |  |
| Amortization of Actuarial Loss |  | O&M Expense | (6 | ) |  | 2 |  |  | (4 | ) |
| Total Pension and OPEB Plans | (4 | ) |  | 1 |  |  | (3 | ) |
| Available-for-Sale Securities |  |  |  |  |  |
| Realized Gains |  | Other Income | 23 |  |  | (12 | ) |  | 11 |  |
| Realized Losses |  | Other Deductions | (4 | ) |  | 2 |  |  | (2 | ) |
| OTTI |  | OTTI | (2 | ) |  | 1 |  |  | (1 | ) |
| Total Available-for-Sale Securities | 17 |  |  | (9 | ) |  | 8 |  |
| Total |  |  | $ | 1 |  |  | $ | (3 | ) |  | $ | (2 | ) |

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