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Pension Benefits - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension liability | $ 759,000,000 | $ 185,000,000 |  |
Investments value | 465,000,000 | 397,000,000 |  |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Regulatory assets and liabilities for future income taxes, net | 734,000,000 |  |  |
Charge to OCI | 8,000,000 |  |  |
Investments value | 17,022,000,000 | 15,608,000,000 | $ 13,450,000,000 | $ 14,274,000,000
Accumulated benefit obligation | 16,768,000,000 | 15,015,000,000 | 13,030,000,000 |
Defined benefit plan, bond amount (excess of) | 50,000,000 |  |  |
Estimated future employer contributions | 480,000,000 |  |  |
Other Nonqualified Supplemental Defined Benefit Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation | 414,000,000 | 395,000,000 |  |
CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension liability | 714,000,000 | 162,000,000 |  |
Investments value | 439,000,000 | 371,000,000 |  |
CECONY | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Regulatory assets and liabilities for future income taxes, net | 696,000,000 |  |  |
Charge to OCI | 2,000,000 |  |  |
Investments value | 16,147,000,000 | 14,790,000,000 | 12,744,000,000 | $ 13,519,000,000
Accumulated benefit obligation | 15,676,000,000 | 14,010,000,000 | $ 12,161,000,000 |
Estimated future employer contributions | 441,000,000 |  |  |
CECONY | Other Nonqualified Supplemental Defined Benefit Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation | $ 377,000,000 | $ 360,000,000 |  |

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