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Pension Benefits - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension liability | $ 174 | $ 1,719 |  |
Investments value | 524 | 459 |  |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (decrease) in regulatory liabilities | (741) |  |  |
Charge to OCI | 1 |  |  |
Noncurrent liabilities | 337 | 311 |  |
Investments value | 15,404 | 14,979 | $ 18,504 | $ 17,022
Accumulated benefit obligation | 11,739 | 11,167 | 15,469 |
Estimated future employer contributions | 11 |  |  |
Other Nonqualified Supplemental Defined Benefit Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation | 349 | 306 |  |
CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension liability | 156 | 1,628 |  |
Investments value | 502 | 439 |  |
CECONY | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (decrease) in regulatory liabilities | (710) |  |  |
Charge to OCI | 2 |  |  |
Noncurrent liabilities | 313 | 287 |  |
Investments value | 14,674 | 14,248 | 17,566 | $ 16,147
Accumulated benefit obligation | 11,031 | 10,478 | $ 14,504 |
Estimated future employer contributions | 9 |  |  |
CECONY | Other Nonqualified Supplemental Defined Benefit Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation | $ 323 | $ 280 |  |

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