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Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables) | 12 Months Ended
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Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income by Component |
| 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, 2021 |  | $ | (6 | ) |  | $ | (355 | ) |  | $ | 11 |  |  | $ | (350 | ) |
| Current Period Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |
| Other Comprehensive Income (Loss) before Reclassifications |  |  | — |  |  |  | (72 | ) |  |  | (158 | ) |  |  | (230 | ) |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | 3 |  |  |  | 1 |  |  |  | 26 |  |  |  | 30 |  |
| Net Current Period Other Comprehensive Income (Loss) |  |  | 3 |  |  |  | (71 | ) |  |  | (132 | ) |  |  | (200 | ) |
| Balance as of December 31, 2022 |  | $ | (3 | ) |  | $ | (426 | ) |  | $ | (121 | ) |  | $ | (550 | ) |
| Other Comprehensive Income (Loss) before Reclassifications |  |  | 9 |  |  |  | 76 |  |  |  | 61 |  |  |  | 146 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | (3 | ) |  |  | 248 |  |  |  | (20 | ) |  |  | 225 |  |
| Net Current Period Other Comprehensive Income (Loss) |  |  | 6 |  |  |  | 324 |  |  |  | 41 |  |  |  | 371 |  |
| Balance as of December 31, 2023 |  | $ | 3 |  |  | $ | (102 | ) |  | $ | (80 | ) |  | $ | (179 | ) |
| Other Comprehensive Income (Loss) before Reclassifications |  |  | 42 |  |  |  | 19 |  |  |  | (18 | ) |  |  | 43 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | (9 | ) |  |  | 7 |  |  |  | 5 |  |  |  | 3 |  |
| Net Current Period Other Comprehensive Income (Loss) |  |  | 33 |  |  |  | 26 |  |  |  | (13 | ) |  |  | 46 |  |
| Balance as of December 31, 2024 |  | $ | 36 |  |  | $ | (76 | ) |  | $ | (93 | ) |  | $ | (133 | ) |
Schedule of Reclassifications Out of Accumulated Other Comprehensive Income |
| PSEG |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Statement of Operations |  |
|  |  |  |  | Year Ended December 31, 2022 |  |
| 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 Derivatives |  | Interest Expense |  | $ | (5 | ) |  | $ | 2 |  |  | $ | (3 | ) |
| Total Cash Flow Hedges |  |  |  |  | (5 | ) |  |  | 2 |  |  |  | (3 | ) |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Net Non-Operating Pension and OPEB Credits (Costs) |  |  | 21 |  |  |  | (6 | ) |  |  | 15 |  |
| Amortization of Actuarial Loss |  | Net Non-Operating Pension and OPEB Credits (Costs) |  |  | (22 | ) |  |  | 6 |  |  |  | (16 | ) |
| Total Pension and OPEB Plans |  |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | ) |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments |  |  | (43 | ) |  |  | 17 |  |  |  | (26 | ) |
| Total Available-for-Sale Securities |  |  |  |  | (43 | ) |  |  | 17 |  |  |  | (26 | ) |
| Total |  |  |  | $ | (49 | ) |  | $ | 19 |  |  | $ | (30 | ) |
| PSEG |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Statement of Operations |  |
|  |  |  |  | Year Ended December 31, 2023 |  |
| 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 Derivatives |  | Interest Expense |  | $ | 5 |  |  | $ | (2 | ) |  | $ | 3 |  |
| Total Cash Flow Hedges |  |  |  |  | 5 |  |  |  | (2 | ) |  |  | 3 |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Net Non-Operating Pension and OPEB Credits (Costs) |  |  | 8 |  |  |  | (2 | ) |  |  | 6 |  |
| Amortization of Actuarial Loss |  | Net Non-Operating Pension and OPEB Credits (Costs) |  |  | (20 | ) |  |  | 6 |  |  |  | (14 | ) |
| Pension Settlement Charge |  | Net Non-Operating Pension and OPEB Credits (Costs) |  |  | (334 | ) |  |  | 94 |  |  |  | (240 | ) |
| Total Pension and OPEB Plans |  |  |  |  | (346 | ) |  |  | 98 |  |  |  | (248 | ) |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments |  |  | 34 |  |  |  | (14 | ) |  |  | 20 |  |
| Total Available-for-Sale Securities |  |  |  |  | 34 |  |  |  | (14 | ) |  |  | 20 |  |
| Total |  |  |  | $ | (307 | ) |  | $ | 82 |  |  | $ | (225 | ) |
| PSEG |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Statement of Operations |  |
|  |  |  |  | Year Ended December 31, 2024 |  |
| 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 Derivatives |  | Interest Expense |  | $ | 13 |  |  | $ | (4 | ) |  | $ | 9 |  |
| Total Cash Flow Hedges |  |  |  |  | 13 |  |  |  | (4 | ) |  |  | 9 |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Net Non-Operating Pension and OPEB Credits (Costs) |  |  | — |  |  |  | — |  |  |  | — |  |
| Amortization of Actuarial Loss |  | Net Non-Operating Pension and OPEB Credits (Costs) |  |  | (10 | ) |  |  | 3 |  |  |  | (7 | ) |
| Total Pension and OPEB Plans |  |  |  |  | (10 | ) |  |  | 3 |  |  |  | (7 | ) |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments |  |  | (8 | ) |  |  | 3 |  |  |  | (5 | ) |
| Total Available-for-Sale Securities |  |  |  |  | (8 | ) |  |  | 3 |  |  |  | (5 | ) |
| Total |  |  |  | $ | (5 | ) |  | $ | 2 |  |  | $ | (3 | ) |

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