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Summary of Significant Accounting Policies and Other Matters - Long-Lived and Intangible Assets (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 MW | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |
Net non-utility plant |  | $ 45,564 | $ 43,889
Intangible assets |  | $ 1,485 | $ 1,557
Con Edison Development | PG&E Project |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Aggregate power to be sold (in MW) | MW | 680 |  |

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