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Summary of Significant Accounting Policies and Other Matters - Long-Lived and Intangible Assets (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) MW | Jun. 30, 2020 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |
Net non-utility plant | $ 43,889 | $ 44,897
Intangible assets | $ 1,557 | $ 1,510
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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