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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, 2023
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, 2020 |  | $ | (9) |  |  | $ | (545) |  |  | $ | 50 |  |  | $ | (504) |  |
| Current Period Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | 176 |  |  | (33) |  |  | 143 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 3 |  |  | 14 |  |  | (6) |  |  | 11 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | 3 |  |  | 190 |  |  | (39) |  |  | 154 |  |
| Balance as of December 31, 2021 |  | $ | (6) |  |  | $ | (355) |  |  | $ | 11 |  |  | $ | (350) |  |
| 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) |  |
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] |
| PSEG |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Statement of Operations |
|  |  |  |  | Year Ended December 31, 2021 |
| 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 |  | $ | (4) |  |  | $ | 1 |  |  | $ | (3) |  |
| Total Cash Flow Hedges |  |  |  | (4) |  |  | 1 |  |  | (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) |  | (41) |  |  | 12 |  |  | (29) |  |
| Total Pension and OPEB Plans |  |  |  | (20) |  |  | 6 |  |  | (14) |  |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments |  | 9 |  |  | (3) |  |  | 6 |  |
| Total Available-for-Sale Securities |  |  |  | 9 |  |  | (3) |  |  | 6 |  |
| Total |  |  |  | $ | (15) |  |  | $ | 4 |  |  | $ | (11) |  |
| 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) |  |

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