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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, 2017
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, 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 | ) |
| Other Comprehensive Income before Reclassifications |  | 2 |  |  | (45 | ) |  | 40 |  |  | (3 | ) |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 33 |  |  | 2 |  |  | 35 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | 2 |  |  | (12 | ) |  | 42 |  |  | 32 |  |
| Balance as of December 31, 2016 |  | $ | 2 |  |  | $ | (398 | ) |  | $ | 133 |  |  | $ | (263 | ) |
| Other Comprehensive Income before Reclassifications |  | — |  |  | (32 | ) |  | 109 |  |  | 77 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (2 | ) |  | 24 |  |  | (65 | ) |  | (43 | ) |
| Net Current Period Other Comprehensive Income (Loss) |  | (2 | ) |  | (8 | ) |  | 44 |  |  | 34 |  |
| Balance as of December 31, 2017 |  | $ | — |  |  | $ | (406 | ) |  | $ | 177 |  |  | $ | (229 | ) |
| 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, 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 | ) |
| Other Comprehensive Income before Reclassifications |  | — |  |  | (42 | ) |  | 39 |  |  | (3 | ) |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 29 |  |  | 3 |  |  | 32 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | (13 | ) |  | 42 |  |  | 29 |  |
| Balance as of December 31, 2016 |  | $ | — |  |  | $ | (340 | ) |  | $ | 129 |  |  | $ | (211 | ) |
| Other Comprehensive Income before Reclassifications |  | — |  |  | (28 | ) |  | 106 |  |  | 78 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 21 |  |  | (60 | ) |  | (39 | ) |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | (7 | ) |  | 46 |  |  | 39 |  |
| Balance as of December 31, 2017 |  | $ | — |  |  | $ | (347 | ) |  | $ | 175 |  |  | $ | (172 | ) |
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, 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 | ) |
| Other-Than-Temporary Impairments (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 | ) |
| PSEG |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Year Ended December 31, 2016 |
| 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 |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | O&M Expense |  | $ | 12 |  |  | $ | (5 | ) |  | $ | 7 |  |
| Amortization of Actuarial Loss |  | O&M Expense |  | (68 | ) |  | 28 |  |  | (40 | ) |
| Total Pension and OPEB Plans |  |  |  | (56 | ) |  | 23 |  |  | (33 | ) |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains |  | Other Income |  | 59 |  |  | (29 | ) |  | 30 |  |
| Realized Losses |  | Other Deductions |  | (37 | ) |  | 19 |  |  | (18 | ) |
| OTTI |  | OTTI |  | (28 | ) |  | 14 |  |  | (14 | ) |
| Total Available-for-Sale Securities |  |  |  | (6 | ) |  | 4 |  |  | (2 | ) |
| Total |  |  |  | $ | (62 | ) |  | $ | 27 |  |  | $ | (35 | ) |
| Power |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Year Ended December 31, 2016 |
| 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 |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | O&M Expense |  | $ | 11 |  |  | $ | (5 | ) |  | $ | 6 |  |
| Amortization of Actuarial Loss |  | O&M Expense |  | (59 | ) |  | 24 |  |  | (35 | ) |
| Total Pension and OPEB Plans |  |  |  | (48 | ) |  | 19 |  |  | (29 | ) |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains |  | Other Income |  | 55 |  |  | (28 | ) |  | 27 |  |
| Realized Losses |  | Other Deductions |  | (33 | ) |  | 17 |  |  | (16 | ) |
| OTTI |  | OTTI |  | (28 | ) |  | 14 |  |  | (14 | ) |
| Total Available-for-Sale Securities |  |  |  | (6 | ) |  | 3 |  |  | (3 | ) |
| Total |  |  |  | $ | (54 | ) |  | $ | 22 |  |  | $ | (32 | ) |
| PSEG |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Year Ended December 31, 2017 |
| 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 |  |  |  |  |  |  |  |  |
| Interest Rate Swaps |  | Interest Expense |  | 3 |  |  | (1 | ) |  | 2 |  |
| Total Cash Flow Hedges |  |  |  | 3 |  |  | (1 | ) |  | 2 |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | O&M Expense |  | $ | 10 |  |  | $ | (4 | ) |  | $ | 6 |  |
| Amortization of Actuarial Loss |  | O&M Expense |  | (51 | ) |  | 21 |  |  | (30 | ) |
| Total Pension and OPEB Plans |  |  |  | (41 | ) |  | 17 |  |  | (24 | ) |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains |  | Other Income |  | 174 |  |  | (89 | ) |  | 85 |  |
| Realized Losses |  | Other Deductions |  | (28 | ) |  | 14 |  |  | (14 | ) |
| OTTI |  | OTTI |  | (12 | ) |  | 6 |  |  | (6 | ) |
| Total Available-for-Sale Securities |  |  |  | 134 |  |  | (69 | ) |  | 65 |  |
| Total |  |  |  | $ | 96 |  |  | $ | (53 | ) |  | $ | 43 |  |
| Power |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Year Ended December 31, 2017 |
| 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 |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | O&M Expense |  | $ | 9 |  |  | $ | (4 | ) |  | $ | 5 |  |
| Amortization of Actuarial Loss |  | O&M Expense |  | (44 | ) |  | 18 |  |  | (26 | ) |
| Total Pension and OPEB Plans |  |  |  | (35 | ) |  | 14 |  |  | (21 | ) |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains |  | Other Income |  | 161 |  |  | (83 | ) |  | 78 |  |
| Realized Losses |  | Other Deductions |  | (24 | ) |  | 12 |  |  | (12 | ) |
| OTTI |  | OTTI |  | (12 | ) |  | 6 |  |  | (6 | ) |
| Total Available-for-Sale Securities |  |  |  | 125 |  |  | (65 | ) |  | 60 |  |
| Total |  |  |  | $ | 90 |  |  | $ | (51 | ) |  | $ | 39 |  |

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