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Pension Benefits - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension liability | $ 445 | $ 174 |  |
Current liabilities | 6,433 | 6,462 |  |
Investments value | 583 | 524 |  |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (decrease) in regulatory liabilities | (86) |  |  |
Charge to OCI | 5 |  |  |
Current liabilities | 63 |  |  |
Noncurrent liabilities | 319 | 337 | $ 311 |
Investments value | 15,278 | 15,404 | 14,979 | $ 18,504
Accumulated benefit obligation | 11,236 | 11,739 | 11,167 |
Estimated future employer contributions | 3 |  |  |
Other Nonqualified Supplemental Defined Benefit Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation | 380 | 349 |  |
CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension liability | 459 | 156 |  |
Current liabilities | 5,559 | 5,694 |  |
Investments value | 560 | 502 |  |
CECONY | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (decrease) in regulatory liabilities | (101) |  |  |
Charge to OCI | 7 |  |  |
Current liabilities | 60 |  |  |
Noncurrent liabilities | 296 | 313 | 287 |
Investments value | 14,591 | 14,674 | 14,248 | $ 17,566
Accumulated benefit obligation | 10,554 | 11,031 | $ 10,478 |
CECONY | Other Nonqualified Supplemental Defined Benefit Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation | $ 354 | $ 323 |  |

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