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Capitalization - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jan. 31, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Schedule of Capitalization [Line Items] |  |  |  |
Number of shares of common stock issued | 1,050,000 |  |  |
Value of common stock issued | $ 88,000,000 | $ 88,000,000 | $ 425,000,000 |
PG&E Project |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |
Short-term debt |  | 980,000,000 |  | $ 1,001,000,000
Debentures | 3.35% Debentures Due 2030 | CECONY |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |
Face amount of debt |  | $ 600,000,000 |  |
Interest rate |  | 3.35% |  |
Debentures | 3.95% Debentures Due 2050 | CECONY |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |
Face amount of debt |  | $ 1,000,000,000 |  |
Interest rate |  | 3.95% |  |

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