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Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables) | 12 Months Ended
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Dec. 31, 2015
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
| PSEG |  | Other Comprehensive Income (Loss) |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for -Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2012 |  | $ | 7 |  |  | $ | (485 | ) |  | $ | 90 |  |  | $ | (388 | ) |
| Other Comprehensive Income before Reclassifications |  | (2 | ) |  | 210 |  |  | 91 |  |  | 299 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (7 | ) |  | 37 |  |  | (36 | ) |  | (6 | ) |
| Net Current Period Other Comprehensive Income (Loss) |  | (9 | ) |  | 247 |  |  | 55 |  |  | 293 |  |
| Balance as of December 31, 2013 |  | $ | (2 | ) |  | $ | (238 | ) |  | $ | 145 |  |  | $ | (95 | ) |
| Other Comprehensive Income before Reclassifications |  | 7 |  |  | (184 | ) |  | 42 |  |  | (135 | ) |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 5 |  |  | 11 |  |  | (69 | ) |  | (53 | ) |
| Net Current Period Other Comprehensive Income (Loss) |  | 12 |  |  | (173 | ) |  | (27 | ) |  | (188 | ) |
| Balance as of December 31, 2014 |  | $ | 10 |  |  | $ | (411 | ) |  | $ | 118 |  |  | $ | (283 | ) |
| Other Comprehensive Income before Reclassifications |  | 2 |  |  | (7 | ) |  | (25 | ) |  | (30 | ) |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (12 | ) |  | 32 |  |  | (2 | ) |  | 18 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | (10 | ) |  | 25 |  |  | (27 | ) |  | (12 | ) |
| Balance as of December 31, 2015 |  | $ | — |  |  | $ | (386 | ) |  | $ | 91 |  |  | $ | (295 | ) |
| Power |  | Other Comprehensive Income (Loss) |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for -Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2012 |  | $ | 9 |  |  | $ | (422 | ) |  | $ | 85 |  |  | $ | (328 | ) |
| Other Comprehensive Income before Reclassifications |  | (2 | ) |  | 185 |  |  | 93 |  |  | 276 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (8 | ) |  | 33 |  |  | (36 | ) |  | (11 | ) |
| Net Current Period Other Comprehensive Income (Loss) |  | (10 | ) |  | 218 |  |  | 57 |  |  | 265 |  |
| Balance as of December 31, 2013 |  | $ | (1 | ) |  | $ | (204 | ) |  | $ | 142 |  |  | $ | (63 | ) |
| Other Comprehensive Income before Reclassifications |  | 7 |  |  | (156 | ) |  | 39 |  |  | (110 | ) |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 5 |  |  | 9 |  |  | (69 | ) |  | (55 | ) |
| Net Current Period Other Comprehensive Income (Loss) |  | 12 |  |  | (147 | ) |  | (30 | ) |  | (165 | ) |
| Balance as of December 31, 2014 |  | $ | 11 |  |  | $ | (351 | ) |  | $ | 112 |  |  | $ | (228 | ) |
| Other Comprehensive Income before Reclassifications |  | 1 |  |  | (4 | ) |  | (24 | ) |  | (27 | ) |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (12 | ) |  | 28 |  |  | (1 | ) |  | 15 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | (11 | ) |  | 24 |  |  | (25 | ) |  | (12 | ) |
| Balance as of December 31, 2015 |  | $ | — |  |  | $ | (327 | ) |  | $ | 87 |  |  | $ | (240 | ) |
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] |
| PSEG |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Year Ended December 31, 2013 |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | Operating Revenues |  | $ | 13 |  |  | $ | (5 | ) |  | $ | 8 |  |
| Interest Rate Swaps |  | Interest Expense |  | (1 | ) |  | — |  |  | (1 | ) |
| Total Cash Flow Hedges |  |  |  | 12 |  |  | (5 | ) |  | 7 |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | O&M Expense |  | 11 |  |  | (4 | ) |  | 7 |  |
| Amortization of Actuarial Loss |  | O&M Expense |  | (75 | ) |  | 31 |  |  | (44 | ) |
| Total Pension and OPEB Plans |  |  |  | (64 | ) |  | 27 |  |  | (37 | ) |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains |  | Other Income |  | 116 |  |  | (59 | ) |  | 57 |  |
| Realized Losses |  | Other Deductions |  | (29 | ) |  | 14 |  |  | (15 | ) |
| Other-Than-Temporary Impairments (OTTI) |  | OTTI |  | (12 | ) |  | 6 |  |  | (6 | ) |
| Total Available-for-Sale Securities |  |  |  | 75 |  |  | (39 | ) |  | 36 |  |
| Total |  |  |  | $ | 23 |  |  | $ | (17 | ) |  | $ | 6 |  |
| Power |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Year Ended December 31, 2013 |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | Operating Revenues |  | $ | 13 |  |  | $ | (5 | ) |  | $ | 8 |  |
| Total Cash Flow Hedges |  |  |  | 13 |  |  | (5 | ) |  | 8 |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | O&M Expense |  | 9 |  |  | (4 | ) |  | 5 |  |
| Amortization of Actuarial Loss |  | O&M Expense |  | (64 | ) |  | 26 |  |  | (38 | ) |
| Total Pension and OPEB Plans |  |  |  | (55 | ) |  | 22 |  |  | (33 | ) |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains |  | Other Income |  | 112 |  |  | (57 | ) |  | 55 |  |
| Realized Losses |  | Other Deductions |  | (26 | ) |  | 13 |  |  | (13 | ) |
| OTTI |  | OTTI |  | (12 | ) |  | 6 |  |  | (6 | ) |
| Total Available-for-Sale Securities |  |  |  | 74 |  |  | (38 | ) |  | 36 |  |
| Total |  |  |  | $ | 32 |  |  | $ | (21 | ) |  | $ | 11 |  |
| PSEG |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Year Ended December 31, 2014 |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | Operating Revenues |  | $ | (9 | ) |  | $ | 4 |  |  | $ | (5 | ) |
| Total Cash Flow Hedges |  |  |  | (9 | ) |  | 4 |  |  | (5 | ) |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | O&M Expense |  | 10 |  |  | (4 | ) |  | 6 |  |
| Amortization of Actuarial Loss |  | O&M Expense |  | (28 | ) |  | 11 |  |  | (17 | ) |
| Total Pension and OPEB Plans |  |  |  | (18 | ) |  | 7 |  |  | (11 | ) |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains |  | Other Income |  | 181 |  |  | (89 | ) |  | 92 |  |
| Realized Losses |  | Other Deductions |  | (26 | ) |  | 13 |  |  | (13 | ) |
| OTTI |  | OTTI |  | (20 | ) |  | 10 |  |  | (10 | ) |
| Total Available-for-Sale Securities |  |  |  | 135 |  |  | (66 | ) |  | 69 |  |
| Total |  |  |  | $ | 108 |  |  | $ | (55 | ) |  | $ | 53 |  |
| Power |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Year Ended December 31, 2014 |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | Operating Revenues |  | $ | (9 | ) |  | $ | 4 |  |  | $ | (5 | ) |
| Total Cash Flow Hedges |  |  |  | (9 | ) |  | 4 |  |  | (5 | ) |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | O&M Expense |  | 9 |  |  | (4 | ) |  | 5 |  |
| Amortization of Actuarial Loss |  | O&M Expense |  | (25 | ) |  | 11 |  |  | (14 | ) |
| Total Pension and OPEB Plans |  |  |  | (16 | ) |  | 7 |  |  | (9 | ) |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains |  | Other Income |  | 178 |  |  | (87 | ) |  | 91 |  |
| Realized Losses |  | Other Deductions |  | (24 | ) |  | 12 |  |  | (12 | ) |
| OTTI |  | OTTI |  | (20 | ) |  | 10 |  |  | (10 | ) |
| Total Available-for-Sale Securities |  |  |  | 134 |  |  | (65 | ) |  | 69 |  |
| Total |  |  |  | $ | 109 |  |  | $ | (54 | ) |  | $ | 55 |  |
| PSEG |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Year Ended December 31, 2015 |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | Operating Revenues |  | $ | 20 |  |  | $ | (8 | ) |  | $ | 12 |  |
| Total Cash Flow Hedges |  |  |  | 20 |  |  | (8 | ) |  | 12 |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | O&M Expense |  | 12 |  |  | (3 | ) |  | 9 |  |
| Amortization of Actuarial Loss |  | O&M Expense |  | (68 | ) |  | 27 |  |  | (41 | ) |
| Total Pension and OPEB Plans |  |  |  | (56 | ) |  | 24 |  |  | (32 | ) |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains |  | Other Income |  | 100 |  |  | (52 | ) |  | 48 |  |
| Realized Losses |  | Other Deductions |  | (39 | ) |  | 20 |  |  | (19 | ) |
| OTTI |  | OTTI |  | (53 | ) |  | 26 |  |  | (27 | ) |
| Total Available-for-Sale Securities |  |  |  | 8 |  |  | (6 | ) |  | 2 |  |
| Total |  |  |  | $ | (28 | ) |  | $ | 10 |  |  | $ | (18 | ) |
| Power |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Year Ended December 31, 2015 |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | Operating Revenues |  | $ | 20 |  |  | $ | (8 | ) |  | $ | 12 |  |
| Total Cash Flow Hedges |  |  |  | 20 |  |  | (8 | ) |  | 12 |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | O&M Expense |  | 11 |  |  | (3 | ) |  | 8 |  |
| Amortization of Actuarial Loss |  | O&M Expense |  | (60 | ) |  | 24 |  |  | (36 | ) |
| Total Pension and OPEB Plans |  |  |  | (49 | ) |  | 21 |  |  | (28 | ) |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains |  | Other Income |  | 98 |  |  | (51 | ) |  | 47 |  |
| Realized Losses |  | Other Deductions |  | (38 | ) |  | 19 |  |  | (19 | ) |
| OTTI |  | OTTI |  | (53 | ) |  | 26 |  |  | (27 | ) |
| Total Available-for-Sale Securities |  |  |  | 7 |  |  | (6 | ) |  | 1 |  |
| Total |  |  |  | $ | (22 | ) |  | $ | 7 |  |  | $ | (15 | ) |

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