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Pension Benefits - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension liability | $ 3,090 | $ 759 |  |
Investments value | 525 | 465 |  |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Regulatory assets and liabilities for future income taxes, net | 3,067 |  |  |
Charge to OCI | 30 |  |  |
Noncurrent liabilities | 459 |  |  |
Investments value | 18,504 | 17,022 | $ 15,608 | $ 13,450
Accumulated benefit obligation | 15,469 | 16,768 | 15,015 |
Estimated future employer contributions | 29 |  |  |
Other Nonqualified Supplemental Defined Benefit Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation | 386 | 414 |  |
CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension liability | 2,899 | 714 |  |
Investments value | 499 | 439 |  |
CECONY | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Regulatory assets and liabilities for future income taxes, net | 2,910 |  |  |
Charge to OCI | 6 |  |  |
Noncurrent liabilities | 381 |  |  |
Investments value | 17,566 | 16,147 | 14,790 | $ 12,744
Accumulated benefit obligation | 14,504 | 15,676 | $ 14,010 |
Estimated future employer contributions | 20 |  |  |
CECONY | Other Nonqualified Supplemental Defined Benefit Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation | $ 352 | $ 377 |  |

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