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Early Plant Retirements Early Plant Retirements (Details) - PSEG Power LLC - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |
ZEC Charge per kwh |  | $ 0.004 |
ZEC Charge per MWh |  | 10 |
Gain (Loss) on Asset Disposition | $ (400,000,000) | 122,000,000 | $ (54,000,000)
Other Production-Solar [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Carrying value of assets |  | 560,000,000 |
Fossil Production [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Carrying value of assets |  | $ 4,500,000,000 |

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