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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, 2021
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, 2018 |  | $ | (1) |  |  | $ | (360) |  |  | $ | (16) |  |  | $ | (377) |  |
| Cumulative Effect Adjustment to Reclassify Stranded Tax Effects Resulting in the Change in the Federal Corporate Income Tax to Retained Earnings |  | — |  |  | (81) |  |  | — |  |  | (81) |  |
| Current Period Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | (17) |  |  | (70) |  |  | 49 |  |  | (38) |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 3 |  |  | 12 |  |  | (8) |  |  | 7 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | (14) |  |  | (58) |  |  | 41 |  |  | (31) |  |
| Net Change in Accumulated Other Comprehensive Income (Loss) |  | (14) |  |  | (139) |  |  | 41 |  |  | (112) |  |
| Balance as of December 31, 2019 |  | $ | (15) |  |  | $ | (499) |  |  | $ | 25 |  |  | $ | (489) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | (4) |  |  | (58) |  |  | 51 |  |  | (11) |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 10 |  |  | 12 |  |  | (26) |  |  | (4) |  |
| Net Current Period Other Comprehensive Income (Loss) |  | 6 |  |  | (46) |  |  | 25 |  |  | (15) |  |
| Balance as of December 31, 2020 |  | $ | (9) |  |  | $ | (545) |  |  | $ | 50 |  |  | $ | (504) |  |
| 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) |  |
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, 2019 |
| 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 |  | $ | (4) |  |  | $ | 1 |  |  | $ | (3) |  |
| Total Cash Flow Hedges |  |  |  | (4) |  |  | 1 |  |  | (3) |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) |  | 26 |  |  | (7) |  |  | 19 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) |  | (43) |  |  | 12 |  |  | (31) |  |
| Total Pension and OPEB Plans |  |  |  | (17) |  |  | 5 |  |  | (12) |  |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments |  | 13 |  |  | (5) |  |  | 8 |  |
| Total Available-for-Sale Securities |  |  |  | 13 |  |  | (5) |  |  | 8 |  |
| Total |  |  |  | $ | (8) |  |  | $ | 1 |  |  | $ | (7) |  |
| PSEG |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Year Ended December 31, 2020 |
| 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 |  | $ | (14) |  |  | $ | 4 |  |  | $ | (10) |  |
| Total Cash Flow Hedges |  |  |  | (14) |  |  | 4 |  |  | (10) |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) |  | 24 |  |  | (7) |  |  | 17 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) |  | (40) |  |  | 11 |  |  | (29) |  |
| Total Pension and OPEB Plans |  |  |  | (16) |  |  | 4 |  |  | (12) |  |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) and Impairments |  | Net Gains (Losses) on Trust Investments |  | 42 |  |  | (16) |  |  | 26 |  |
| Total Available-for-Sale Securities |  |  |  | 42 |  |  | (16) |  |  | 26 |  |
| Total |  |  |  | $ | 12 |  |  | $ | (8) |  |  | $ | 4 |  |
| PSEG |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | 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 Swaps |  | Interest Expense |  | $ | (4) |  |  | $ | 1 |  |  | $ | (3) |  |
| Total Cash Flow Hedges |  |  |  | (4) |  |  | 1 |  |  | (3) |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) |  | 21 |  |  | (6) |  |  | 15 |  |
| Amortization of Actuarial Loss |  | 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) |  |

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