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Capitalization - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | May 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Feb. 28, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Nov. 30, 2019 | Oct. 31, 2019 | Sep. 30, 2019
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock issued (shares) |  |  |  | 5,649,369 |  |  |  |  |  |  |  |
Value of common stock issued |  |  |  | $ 425,000,000 |  | $ 400,000,000 | $ 425,000,000 | $ 705,000,000 |  |  |  |
Term loan |  |  |  |  |  |  |  | 825,000,000 |  |  |  | $ 0
PG&E Project |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Term loan |  |  |  |  |  |  |  |  |  |  |  | $ 1,012,000,000
Clean Energy Businesses |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse debt |  |  |  |  |  |  |  | 2,076,000,000 |  |  |  |
Clean Energy Businesses | Long-term debt due within one year |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse debt |  |  |  |  |  |  |  | 1,965,000,000 |  |  |  |
Clean Energy Businesses | Long-term debt |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse debt |  |  |  |  |  |  |  | $ 111,000,000 |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  | $ 825,000,000 |  |  |  |  |  |  |
Debt term |  |  |  |  | 2 years |  |  |  |  |  |  |
Repayment of debt | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |
Debentures | 4.125% Debentures Due 2049 | CECONY |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate |  | 4.125% |  |  |  |  |  |  |  |  |  |
Debentures | 6.65% 10-Year Debentures | CECONY |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt term |  |  | 10 years |  |  |  |  |  |  |  |  |
Repayment of debt |  |  | $ 475,000,000 |  |  |  |  |  |  |  |  |
Interest rate |  |  | 665.00% |  |  |  |  |  |  |  |  |
Transition Bond | O&R |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment of debt |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |
Secured Debt | Term Loan Due 2026 | Con Edison Development |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  | $ 464,000,000 |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock issued (shares) |  |  |  |  |  | 5,000,000 | 6,000,000 | 10,000,000 |  |  |  |
Value of common stock issued |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |
Forward Contracts |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (shares) |  | 5,800,000 |  |  |  |  |  |  |  |  |  | 1,050,000
Share price (dollars per share) |  | $ 84.83 |  |  |  |  |  |  |  |  |  |
Forward Contracts | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock issued (shares) | 4,750,000 |  |  |  |  |  |  |  |  |  |  |
Value of common stock issued | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Debentures | 3.73% Debentures Due 2049 | O&R |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  | $ 43,000,000 |  |
Interest rate |  |  |  |  |  |  |  |  |  | 3.73% |  |
Scenario, Forecast | Debentures | 2.94% Debentures Due 2029 | O&R |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  | $ 44,000,000 |  |  |
Interest rate |  |  |  |  |  |  |  |  | 2.94% |  |  |
Scenario, Forecast | Debentures | 3.46% Debentures Due 2039 | O&R |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  | $ 38,000,000 |  |  |
Interest rate |  |  |  |  |  |  |  |  | 3.46% |  |  |
Subsequent Event | Senior Notes | 3.82% Senior Notes Due 2038 | Con Edison Development |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  | $ 303,000,000 |
Interest rate |  |  |  |  |  |  |  |  |  |  | 3.82% |

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