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Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables) | 6 Months Ended
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Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income by Component |
| PSEG |  | Three Months Ended June 30, 2021 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of March 31, 2021 |  | $ | (8) |  |  | $ | (542) |  |  | $ | 8 |  |  | $ | (542) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | — |  |  | 16 |  |  | 16 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 4 |  |  | — |  |  | 4 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | 4 |  |  | 16 |  |  | 20 |  |
| Balance as of June 30, 2021 |  | $ | (8) |  |  | $ | (538) |  |  | $ | 24 |  |  | $ | (522) |  |
| PSEG |  | Three Months Ended June 30, 2020 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of March 31, 2020 |  | $ | (18) |  |  | $ | (496) |  |  | $ | 33 |  |  | $ | (481) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | — |  |  | 30 |  |  | 30 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 3 |  |  | 3 |  |  | (10) |  |  | (4) |  |
| Net Current Period Other Comprehensive Income (Loss) |  | 3 |  |  | 3 |  |  | 20 |  |  | 26 |  |
| Balance as of June 30, 2020 |  | $ | (15) |  |  | $ | (493) |  |  | $ | 53 |  |  | $ | (455) |  |
| PSEG |  | Six Months Ended June 30, 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 |  | — |  |  | — |  |  | (24) |  |  | (24) |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 1 |  |  | 7 |  |  | (2) |  |  | 6 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | 1 |  |  | 7 |  |  | (26) |  |  | (18) |  |
| Balance as of June 30, 2021 |  | $ | (8) |  |  | $ | (538) |  |  | $ | 24 |  |  | $ | (522) |  |
| PSEG |  | Six Months Ended June 30, 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) |  |  | — |  |  | 44 |  |  | 40 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 4 |  |  | 6 |  |  | (16) |  |  | (6) |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | 6 |  |  | 28 |  |  | 34 |  |
| Balance as of June 30, 2020 |  | $ | (15) |  |  | $ | (493) |  |  | $ | 53 |  |  | $ | (455) |  |
| PSEG Power |  | Three Months Ended June 30, 2021 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of March 31, 2021 |  | $ | — |  |  | $ | (457) |  |  | $ | 8 |  |  | $ | (449) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | — |  |  | 13 |  |  | 13 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 3 |  |  | (1) |  |  | 2 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | 3 |  |  | 12 |  |  | 15 |  |
| Balance as of June 30, 2021 |  | $ | — |  |  | $ | (454) |  |  | $ | 20 |  |  | $ | (434) |  |
| PSEG Power |  | Three Months Ended June 30, 2020 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of March 31, 2020 |  | $ | — |  |  | $ | (418) |  |  | $ | 26 |  |  | $ | (392) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | — |  |  | 24 |  |  | 24 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 3 |  |  | (9) |  |  | (6) |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | 3 |  |  | 15 |  |  | 18 |  |
| Balance as of June 30, 2020 |  | $ | — |  |  | $ | (415) |  |  | $ | 41 |  |  | $ | (374) |  |
| PSEG Power |  | Six Months Ended June 30, 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 |  | — |  |  | — |  |  | (18) |  |  | (18) |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 5 |  |  | (2) |  |  | 3 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | 5 |  |  | (20) |  |  | (15) |  |
| Balance as of June 30, 2021 |  | $ | — |  |  | $ | (454) |  |  | $ | 20 |  |  | $ | (434) |  |
| PSEG Power |  | Six Months Ended June 30, 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 |  | — |  |  | — |  |  | 35 |  |  | 35 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 5 |  |  | (13) |  |  | (8) |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | 5 |  |  | 22 |  |  | 27 |  |
| Balance as of June 30, 2020 |  | $ | — |  |  | $ | (415) |  |  | $ | 41 |  |  | $ | (374) |  |
Reclassifications out of Accumulated Other Comprehensive Income |
| PSEG |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  | Three Months Ended |  | Six Months Ended |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations | June 30, 2021 |  | June 30, 2021 |
|  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest Rate Swaps |  | Interest Expense | $ | (1) |  |  | $ | 1 |  |  | $ | — |  |  | $ | (2) |  |  | $ | 1 |  |  | $ | (1) |  |
| Total Cash Flow Hedges | (1) |  |  | 1 |  |  | — |  |  | (2) |  |  | 1 |  |  | (1) |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) | 6 |  |  | (2) |  |  | 4 |  |  | 11 |  |  | (3) |  |  | 8 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) | (11) |  |  | 3 |  |  | (8) |  |  | (21) |  |  | 6 |  |  | (15) |  |
| Total Pension and OPEB Plans | (5) |  |  | 1 |  |  | (4) |  |  | (10) |  |  | 3 |  |  | (7) |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments | 1 |  |  | (1) |  |  | — |  |  | 4 |  |  | (2) |  |  | 2 |  |
| Total Available-for-Sale Debt Securities | 1 |  |  | (1) |  |  | — |  |  | 4 |  |  | (2) |  |  | 2 |  |
| Total |  |  | $ | (5) |  |  | $ | 1 |  |  | $ | (4) |  |  | $ | (8) |  |  | $ | 2 |  |  | $ | (6) |  |
| PSEG |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  | Three Months Ended |  | Six Months Ended |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations | June 30, 2020 |  | June 30, 2020 |
|  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest Rate Swaps |  | Interest Expense | $ | (4) |  |  | $ | 1 |  |  | $ | (3) |  |  | $ | (6) |  |  | $ | 2 |  |  | $ | (4) |  |
| Total Cash Flow Hedges | (4) |  |  | 1 |  |  | (3) |  |  | (6) |  |  | 2 |  |  | (4) |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) | 6 |  |  | (1) |  |  | 5 |  |  | 12 |  |  | (3) |  |  | 9 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) | (10) |  |  | 2 |  |  | (8) |  |  | (20) |  |  | 5 |  |  | (15) |  |
| Total Pension and OPEB Plans | (4) |  |  | 1 |  |  | (3) |  |  | (8) |  |  | 2 |  |  | (6) |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) and Impairments |  | Net Gains (Losses) on Trust Investments | 17 |  |  | (7) |  |  | 10 |  |  | 26 |  |  | (10) |  |  | 16 |  |
| Total Available-for-Sale Debt Securities | 17 |  |  | (7) |  |  | 10 |  |  | 26 |  |  | (10) |  |  | 16 |  |
| Total |  |  | $ | 9 |  |  | $ | (5) |  |  | $ | 4 |  |  | $ | 12 |  |  | $ | (6) |  |  | $ | 6 |  |
| PSEG Power |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  | Three Months Ended |  | Six Months Ended |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations | June 30, 2021 |  | June 30, 2021 |
|  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |  | 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 |  |  | $ | (2) |  |  | $ | 3 |  |  | $ | 10 |  |  | $ | (3) |  |  | $ | 7 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) | (9) |  |  | 3 |  |  | (6) |  |  | (17) |  |  | 5 |  |  | (12) |  |
| Total Pension and OPEB Plans | (4) |  |  | 1 |  |  | (3) |  |  | (7) |  |  | 2 |  |  | (5) |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments | 1 |  |  | — |  |  | 1 |  |  | 3 |  |  | (1) |  |  | 2 |  |
| Total Available-for-Sale Debt Securities | 1 |  |  | — |  |  | 1 |  |  | 3 |  |  | (1) |  |  | 2 |  |
| Total |  |  | $ | (3) |  |  | $ | 1 |  |  | $ | (2) |  |  | $ | (4) |  |  | $ | 1 |  |  | $ | (3) |  |
| PSEG Power |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  | Three Months Ended |  | Six Months Ended |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations | June 30, 2020 |  | June 30, 2020 |
|  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |  | 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 |  |  | $ | 11 |  |  | $ | (3) |  |  | $ | 8 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) | (9) |  |  | 2 |  |  | (7) |  |  | (17) |  |  | 4 |  |  | (13) |  |
| Total Pension and OPEB Plans | (3) |  |  | — |  |  | (3) |  |  | (6) |  |  | 1 |  |  | (5) |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) and Impairments |  | Net Gains (Losses) on Trust Investments | 14 |  |  | (5) |  |  | 9 |  |  | 21 |  |  | (8) |  |  | 13 |  |
| Total Available-for-Sale Debt Securities | 14 |  |  | (5) |  |  | 9 |  |  | 21 |  |  | (8) |  |  | 13 |  |
| Total |  |  | $ | 11 |  |  | $ | (5) |  |  | $ | 6 |  |  | $ | 15 |  |  | $ | (7) |  |  | $ | 8 |  |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: 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=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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