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v3.20.1

Summary of Significant Accounting Policies and Other Matters - Long-Lived and Intangible Assets (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) MW | Mar. 31, 2020 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |
Net non-utility plant | $ 43,889 | $ 44,435
Intangible assets | 1,557 | 1,532
PG&E Project |  |
Finite-Lived Intangible Assets [Line Items] |  |
Net non-utility plant | 819 | 802
Intangible assets | 1,057 | 1,039
Long-term debt | 1,001 | 980
PG&E Project | Secured Related to Project Debt |  |
Finite-Lived Intangible Assets [Line Items] |  |
Net non-utility plant | $ 282 | $ 274
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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