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Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables) | 3 Months Ended
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Mar. 31, 2020
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, 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 | ) |
| Current Period Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
| Other Comprehensive Income 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 |  | Three Months Ended March 31, 2019 |
| 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 before Reclassifications |  | (4 | ) |  | (3 | ) |  | 20 |  |  | 13 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 3 |  |  | 1 |  |  | 4 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | (4 | ) |  | — |  |  | 21 |  |  | 17 |  |
| Net Change in Accumulated Other Comprehensive Income (Loss) |  | (4 | ) |  | (81 | ) |  | 21 |  |  | (64 | ) |
| Balance as of March 31, 2019 |  | $ | (5 | ) |  | $ | (441 | ) |  | $ | 5 |  |  | $ | (441 | ) |
| 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 | ) |
| Current Period Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
| Other Comprehensive Income 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 | ) |
| PSEG Power |  | Three Months Ended March 31, 2019 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2018 |  | $ | — |  |  | $ | (306 | ) |  | $ | (13 | ) |  | $ | (319 | ) |
| Cumulative Effect Adjustment to Reclassify Stranded Tax Effects Resulting in the Change in the Federal Corporate Income Tax to Retained Earnings |  | — |  |  | (69 | ) |  | — |  |  | (69 | ) |
| Current Period Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
| Other Comprehensive Income before Reclassifications |  | — |  |  | (3 | ) |  | 15 |  |  | 12 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 3 |  |  | 1 |  |  | 4 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | — |  |  | 16 |  |  | 16 |  |
| Net Change in Accumulated Other Comprehensive Income (Loss) |  | — |  |  | (69 | ) |  | 16 |  |  | (53 | ) |
| Balance as of March 31, 2019 |  | $ | — |  |  | $ | (375 | ) |  | $ | 3 |  |  | $ | (372 | ) |
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, 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 |  |  | 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, 2019 |
|  | 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) | $ | 7 |  |  | $ | (2 | ) |  | $ | 5 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) | (12 | ) |  | 4 |  |  | (8 | ) |
| Total Pension and OPEB Plans | (5 | ) |  | 2 |  |  | (3 | ) |
| Available-for-Sale Debt Securities |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments | (1 | ) |  | — |  |  | (1 | ) |
| Total Available-for-Sale Debt Securities | (1 | ) |  | — |  |  | (1 | ) |
| Total |  |  | $ | (6 | ) |  | $ | 2 |  |  | $ | (4 | ) |
| 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 |  |
| 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, 2019 |
|  | 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) | $ | 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) |  | Net Gains (Losses) on Trust Investments | (1 | ) |  | — |  |  | (1 | ) |
| Total Available-for-Sale Debt Securities | (1 | ) |  | — |  |  | (1 | ) |
| Total |  |  | $ | (5 | ) |  | $ | 1 |  |  | $ | (4 | ) |

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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