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Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables) | 3 Months Ended
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Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income by Component |
| PSEG |  | Three Months Ended March 31, 2021 |
| 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) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | — |  |  | (40) |  |  | (40) |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 1 |  |  | 3 |  |  | (2) |  |  | 2 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | 1 |  |  | 3 |  |  | (42) |  |  | (38) |  |
| Balance as of March 31, 2021 |  | $ | (8) |  |  | $ | (542) |  |  | $ | 8 |  |  | $ | (542) |  |
| PSEG |  | Three Months Ended March 31, 2020 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2019 |  | $ | (15) |  |  | $ | (499) |  |  | $ | 25 |  |  | $ | (489) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | (4) |  |  | — |  |  | 14 |  |  | 10 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 1 |  |  | 3 |  |  | (6) |  |  | (2) |  |
| Net Current Period Other Comprehensive Income (Loss) |  | (3) |  |  | 3 |  |  | 8 |  |  | 8 |  |
| Balance as of March 31, 2020 |  | $ | (18) |  |  | $ | (496) |  |  | $ | 33 |  |  | $ | (481) |  |
| PSEG Power |  | Three Months Ended March 31, 2021 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2020 |  | $ | — |  |  | $ | (459) |  |  | $ | 40 |  |  | $ | (419) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | — |  |  | (31) |  |  | (31) |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 2 |  |  | (1) |  |  | 1 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | 2 |  |  | (32) |  |  | (30) |  |
| Balance as of March 31, 2021 |  | $ | — |  |  | $ | (457) |  |  | $ | 8 |  |  | $ | (449) |  |
| PSEG Power |  | Three Months Ended March 31, 2020 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2019 |  | $ | — |  |  | $ | (420) |  |  | $ | 19 |  |  | $ | (401) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | — |  |  | 11 |  |  | 11 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 2 |  |  | (4) |  |  | (2) |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | 2 |  |  | 7 |  |  | 9 |  |
| Balance as of March 31, 2020 |  | $ | — |  |  | $ | (418) |  |  | $ | 26 |  |  | $ | (392) |  |
Reclassifications out of Accumulated Other Comprehensive Income |
| PSEG |  |  |  |  |  |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  |  | Three Months Ended |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations |  |  | March 31, 2021 |
|  |  |  |  |  |  |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  |  |  |  |  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest Rate Swaps |  | Interest Expense |  |  |  |  |  |  | $ | (1) |  |  | $ | — |  |  | $ | (1) |  |
| Total Cash Flow Hedges |  |  |  |  |  |  | (1) |  |  | — |  |  | (1) |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) |  |  |  |  |  |  | 5 |  |  | (1) |  |  | 4 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) |  |  |  |  |  |  | (10) |  |  | 3 |  |  | (7) |  |
| Total Pension and OPEB Plans |  |  |  |  |  |  | (5) |  |  | 2 |  |  | (3) |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments |  |  |  |  |  |  | 3 |  |  | (1) |  |  | 2 |  |
| Total Available-for-Sale Debt Securities |  |  |  |  |  |  | 3 |  |  | (1) |  |  | 2 |  |
| Total |  |  |  |  |  |  |  |  | $ | (3) |  |  | $ | 1 |  |  | $ | (2) |  |
| PSEG |  |  |  |  |  |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  |  | Three Months Ended |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations |  |  | March 31, 2020 |
|  |  |  |  |  |  |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  |  |  |  |  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest Rate Swaps |  | Interest Expense |  |  |  |  |  |  | $ | (2) |  |  | $ | 1 |  |  | $ | (1) |  |
| Total Cash Flow Hedges |  |  |  |  |  |  | (2) |  |  | 1 |  |  | (1) |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) |  |  |  |  |  |  | 6 |  |  | (2) |  |  | 4 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) |  |  |  |  |  |  | (10) |  |  | 3 |  |  | (7) |  |
| Total Pension and OPEB Plans |  |  |  |  |  |  | (4) |  |  | 1 |  |  | (3) |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) and Impairments |  | Net Gains (Losses) on Trust Investments |  |  |  |  |  |  | 9 |  |  | (3) |  |  | 6 |  |
| Total Available-for-Sale Debt Securities |  |  |  |  |  |  | 9 |  |  | (3) |  |  | 6 |  |
| Total |  |  |  |  |  |  |  |  | $ | 3 |  |  | $ | (1) |  |  | $ | 2 |  |
| PSEG Power |  |  |  |  |  |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  |  | Three Months Ended |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations |  |  | March 31, 2021 |
|  |  |  |  |  |  |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  |  |  |  |  |  |  | Millions |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) |  |  |  |  |  |  | $ | 5 |  |  | $ | (1) |  |  | $ | 4 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) |  |  |  |  |  |  | (8) |  |  | 2 |  |  | (6) |  |
| Total Pension and OPEB Plans |  |  |  |  |  |  | (3) |  |  | 1 |  |  | (2) |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments |  |  |  |  |  |  | 2 |  |  | (1) |  |  | 1 |  |
| Total Available-for-Sale Debt Securities |  |  |  |  |  |  | 2 |  |  | (1) |  |  | 1 |  |
| Total |  |  |  |  |  |  |  |  | $ | (1) |  |  | $ | — |  |  | $ | (1) |  |
| PSEG Power |  |  |  |  |  |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  |  | Three Months Ended |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations |  |  | March 31, 2020 |
|  |  |  |  |  |  |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  |  |  |  |  |  |  | Millions |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) |  |  |  |  |  |  | $ | 5 |  |  | $ | (1) |  |  | $ | 4 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) |  |  |  |  |  |  | (8) |  |  | 2 |  |  | (6) |  |
| Total Pension and OPEB Plans |  |  |  |  |  |  | (3) |  |  | 1 |  |  | (2) |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) and Impairments |  | Net Gains (Losses) on Trust Investments |  |  |  |  |  |  | 7 |  |  | (3) |  |  | 4 |  |
| Total Available-for-Sale Debt Securities |  |  |  |  |  |  | 7 |  |  | (3) |  |  | 4 |  |
| Total |  |  |  |  |  |  |  |  | $ | 4 |  |  | $ | (2) |  |  | $ | 2 |  |

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