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Pension Benefits - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension liability | $ 1,719 | $ 3,090 |  |
Investments value | 459 | 525 |  |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Regulatory assets and liabilities for future income taxes, net | 1,655 |  |  |
Charge to OCI | 15 |  |  |
Noncurrent liabilities | 311 | 459 |  |
Investments value | 14,979 | 18,504 | $ 17,022 | $ 15,608
Accumulated benefit obligation | 11,167 | 15,469 | 16,768 |
Estimated future employer contributions | 10 |  |  |
Other Nonqualified Supplemental Defined Benefit Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation | 306 | 386 |  |
CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension liability | 1,628 | 2,899 |  |
Investments value | 439 | 499 |  |
CECONY | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Regulatory assets and liabilities for future income taxes, net | 1,579 |  |  |
Charge to OCI | 3 |  |  |
Noncurrent liabilities | 287 | 381 |  |
Investments value | 14,248 | 17,566 | 16,147 | $ 14,790
Accumulated benefit obligation | 10,478 | 14,504 | $ 15,676 |
Estimated future employer contributions | 8 |  |  |
CECONY | Other Nonqualified Supplemental Defined Benefit Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation | $ 280 | $ 352 |  |

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