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Summary of Significant Accounting Policies and Other Matters - Long-Lived and Intangible Assets (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 USD ($) MW | Dec. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |
Net non-utility plant | $ 43,234 | $ 41,749
Intangible assets | 1,580 | $ 1,654
PG&E Project |  |
Finite-Lived Intangible Assets [Line Items] |  |
Net non-utility plant | 827 |
Intangible assets | 1,075 |
Long-term debt | 1,012 |
PG&E Project | Secured Related to Project Debt |  |
Finite-Lived Intangible Assets [Line Items] |  |
Net non-utility plant | $ 287 |
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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