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Capitalization - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jan. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jul. 31, 2020 | 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 | $ 0 | $ 0 | $ 88,000,000 | $ 0 | $ 400,000,000 | $ 425,000,000 |  |
Face amount of debt |  |  |  |  |  |  |  |  | $ 820,000,000 |
PG&E Project |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  |  |  |  | $ 1,001,000,000
Long-term debt |  |  | 898,000,000 |  |  |  |  |  |  |
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% |  |  |  |  |
Debentures | 4.45% 10 Year Debentures | CECONY |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt | $ 350,000,000 |  |  | $ 350,000,000 |  |  |  |  |  |
Interest rate | 4.45% |  |  | 4.45% |  |  |  |  |  |
Debt instrument term | 10 years |  |  |  |  |  |  |  |  |
Debentures | 2.02% Debentures Due 2030 | CECONY |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 35,000,000 |  |  |  |  |  |  |
Interest rate |  |  | 2.02% |  |  |  |  |  |  |
Debentures | 3.24% Debentures Due 2050 | CECONY |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 40,000,000 |  |  |  |  |  |  |
Interest rate |  |  | 3.24% |  |  |  |  |  |  |

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