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v3.21.2

Capitalization - Additional Information (Details) | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) shares | May 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Feb. 28, 2021 USD ($) project
Schedule of Capitalization [Line Items] |  |  |  |  |  |
Issuance of common shares – public offering (shares) | shares | 10,100,000 |  |  |  |  |
Proceeds from issuance of equity | $ 775,000,000 |  |  |  |  |
Borrowings Due 2028 | Clean Energy Businesses |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 250,000,000
Number of solar electric production projects | project |  |  |  |  |  | 4
Interest rate |  |  |  |  |  | 3.39%
Tax Equity Financing Agreement | Clean Energy Businesses |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |
Number of solar electric production projects | project |  |  |  |  |  | 3
Amount funded from tax equity financing agreement |  |  | $ 263,000,000 |  |  |
2.40 percent maturing in 2031 | CECONY | Subsidiaries |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |
Face amount of debt |  |  | $ 750,000,000 |  |  |
Interest rate |  |  | 2.40% |  |  |
3.60 percent maturing in 2061 | CECONY | Subsidiaries |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |
Face amount of debt |  |  | $ 750,000,000 |  |  |
Interest rate |  |  | 3.60% |  |  |
2.00% Debentures Due 2021 |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |
Interest rate |  | 2.00% |  |  |  |
Repayments of debt |  | $ 500,000,000 |  |  |  |
Debt instrument term |  | 5 years |  |  |  |
Floating Debentures | CECONY | Subsidiaries |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |
Repayments of debt | $ 640,000,000 |  |  |  |  |
Debt instrument term | 3 years |  |  |  |  |
Floating Rate Notes Due 2024 | Clean Energy Businesses |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |
Long-term debt |  |  | $ 37,000,000 |  |  |
2.31% Debenture Due 2031 |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |
Face amount of debt |  |  | $ 45,000,000 |  |  |
Interest rate |  |  | 231.00% |  |  |
3.17% Debenture Due 2051 |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |
Face amount of debt |  |  | $ 30,000,000 |  |  |
Interest rate |  |  | 317.00% |  |  |
Senior Notes | 3.77% Senior Notes Due 2046 | Clean Energy Businesses | Subsidiaries |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |
Face amount of debt | $ 229,000,000 |  |  | $ 229,000,000 | $ 3.77 |
Repayments of debt |  |  |  | $ 675,000,000 |  |
Senior Notes | 4.45% 10 Year Debentures | Clean Energy Businesses |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |
Interest rate |  |  | 4.52% |  |  |
Long-term debt |  |  | $ 104,000,000 |  |  |

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