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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, 2020
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Accumulated Other Comprehensive Income (Loss), Net of Tax
| 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, 2017 |  | $ | — |  |  | $ | (406) |  |  | $ | 177 |  |  | $ | (229) |  |
| Cumulative Effect Adjustment to Reclassify Unrealized Net Gains on Equity Investments to Retained Earnings |  | — |  |  | — |  |  | (176) |  |  | (176) |  |
| Current Period Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | (1) |  |  | 17 |  |  | (25) |  |  | (9) |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 29 |  |  | 8 |  |  | 37 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | (1) |  |  | 46 |  |  | (17) |  |  | 28 |  |
| Net Change in Accumulated Other Comprehensive Income (Loss) |  | (1) |  |  | 46 |  |  | (193) |  |  | (148) |  |
| 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) |  |
| PSEG Power |  | 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, 2017 |  | $ | — |  |  | $ | (347) |  |  | $ | 175 |  |  | $ | (172) |  |
| Cumulative Effect Adjustment to Reclassify Unrealized Net Gains on Equity Investments to Retained Earnings |  | — |  |  | — |  |  | (175) |  |  | (175) |  |
| Current Period Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | 16 |  |  | (19) |  |  | (3) |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 25 |  |  | 6 |  |  | 31 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | 41 |  |  | (13) |  |  | 28 |  |
| Net Change in Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 41 |  |  | (188) |  |  | (147) |  |
| 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 (Loss) before Reclassifications |  | — |  |  | (55) |  |  | 38 |  |  | (17) |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 10 |  |  | (6) |  |  | 4 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | (45) |  |  | 32 |  |  | (13) |  |
| Net Change in Accumulated Other Comprehensive Income (Loss) |  | — |  |  | (114) |  |  | 32 |  |  | (82) |  |
| Balance as of December 31, 2019 |  | $ | — |  |  | $ | (420) |  |  | $ | 19 |  |  | $ | (401) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | (48) |  |  | 41 |  |  | (7) |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 9 |  |  | (20) |  |  | (11) |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | (39) |  |  | 21 |  |  | (18) |  |
| Balance as of December 31, 2020 |  | $ | — |  |  | $ | (459) |  |  | $ | 40 |  |  | $ | (419) |  |
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, 2018 |
| 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 |
| 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) |  | (47) |  |  | 14 |  |  | (33) |  |
| Total Pension and OPEB Plans |  |  |  | (41) |  |  | 12 |  |  | (29) |  |
| 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 |  |  |  | $ | (54) |  |  | $ | 17 |  |  | $ | (37) |  |
| PSEG Power |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  |  | Year Ended December 31, 2018 |
| 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 |
| 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) |  | (40) |  |  | 11 |  |  | (29) |  |
| Total Pension and OPEB Plans |  |  |  | (35) |  |  | 10 |  |  | (25) |  |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments |  | (11) |  |  | 5 |  |  | (6) |  |
| Total Available-for-Sale Securities |  |  |  | (11) |  |  | 5 |  |  | (6) |  |
| Total |  |  |  | $ | (46) |  |  | $ | 15 |  |  | $ | (31) |  |
| 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 Power |  |  |  | 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 |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) |  | $ | 23 |  |  | $ | (7) |  |  | $ | 16 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) |  | (36) |  |  | 10 |  |  | (26) |  |
| Total Pension and OPEB Plans |  |  |  | (13) |  |  | 3 |  |  | (10) |  |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments |  | 10 |  |  | (4) |  |  | 6 |  |
| Total Available-for-Sale Securities |  |  |  | 10 |  |  | (4) |  |  | 6 |  |
| Total |  |  |  | $ | (3) |  |  | $ | (1) |  |  | $ | (4) |  |
| 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 Power |  |  |  | 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 |
| 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) |  | (34) |  |  | 10 |  |  | (24) |  |
| Total Pension and OPEB Plans |  |  |  | (13) |  |  | 4 |  |  | (9) |  |
| Available-for-Sale Securities |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) and Impairments |  | Net Gains (Losses) on Trust Investments |  | 34 |  |  | (14) |  |  | 20 |  |
| Total Available-for-Sale Securities |  |  |  | 34 |  |  | (14) |  |  | 20 |  |
| Total |  |  |  | $ | 21 |  |  | $ | (10) |  |  | $ | 11 |  |

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