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Income Tax - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Income Taxes Disclosure [Line Items] |  |  |  |  |
Income tax expense (benefit) | $ 127.0 | $ 119.0 | $ 194.0 | $ 183.0 |
Unprotected excess deferred federal income taxes amortization period |  |  | 5 years |  |
Estimated liability for uncertain tax positions | 17.0 |  | $ 17.0 |  |
Effective income tax rate reconciliation, uncertainty of taxes |  |  | 3.0 |  |
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate | 17.0 |  | 17.0 |  |
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate, net of federal taxes | 16.0 |  | 16.0 |  |
Subsidiaries |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |
Income tax expense (benefit) | 90.0 | 97.0 | 188.0 | $ 199.0 |
CECONY | Subsidiaries |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |
Income tax expense (benefit) | 90.0 | $ 97.0 |  |  |
Estimated liability for uncertain tax positions | 6.0 |  | 6.0 |  |
Effective income tax rate reconciliation, uncertainty of taxes |  |  | 1.0 |  |
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate | $ 6.0 |  | 6.0 |  |
Tax Year 2013 |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |
Discrete income tax benefit |  |  | 4.0 |  |
Tax Year 2018 to 2013 |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |
Operating loss carryback |  |  | $ 29.0 |  |
Net tax refund |  |  |  |  | $ 2.5

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