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Other Postretirement Benefits - Schedule of Fair Values of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | $ 583 | $ 524 |  |
CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 560 | 502 |  |
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 934 | 929 | $ 860 | $ 1,150
Other Postretirement Benefits | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 744 | 750 | $ 708 | $ 955
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 736 | 717 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Total investments | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 548 | 540 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 302 | 331 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Equity | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 205 | 241 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 323 | 323 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Other Fixed Income Debt | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 233 | 237 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 34 | 25 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Cash and Cash Equivalents | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 33 | 24 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Commingled Trust Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 38 | 38 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Commingled Trust Fund | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 38 | 38 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Real Estate and Other Alternatives |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 39 |  |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Real Estate and Other Alternatives | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 39 |  |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 140 | 148 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Funds For Retiree Health Benefits | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 140 | 148 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Investments, Including Funds For Retiree Health Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 876 | 865 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Investments, Including Funds For Retiree Health Benefit | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 688 | 688 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Funds For Retiree Health Benefits Measured At Net Asset Value |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 39 | 45 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Funds For Retiree Health Benefits Measured At Net Asset Value | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 39 | 45 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Pending Activities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 19 | 19 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Pending Activities | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 17 | 17 |  |
Other Postretirement Benefits | Level 1 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 7 | 7 |  |
Other Postretirement Benefits | Level 1 | Total investments | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 7 | 7 |  |
Other Postretirement Benefits | Level 1 | Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Other Postretirement Benefits | Level 1 | Equity | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Other Postretirement Benefits | Level 1 | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Other Postretirement Benefits | Level 1 | Other Fixed Income Debt | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Other Postretirement Benefits | Level 1 | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 7 | 7 |  |
Other Postretirement Benefits | Level 1 | Cash and Cash Equivalents | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 7 | 7 |  |
Other Postretirement Benefits | Level 1 | Commingled Trust Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Other Postretirement Benefits | Level 1 | Commingled Trust Fund | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Other Postretirement Benefits | Level 1 | Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 50 | 52 |  |
Other Postretirement Benefits | Level 1 | Funds For Retiree Health Benefits | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 50 | 52 |  |
Other Postretirement Benefits | Level 1 | Investments, Including Funds For Retiree Health Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 57 | 59 |  |
Other Postretirement Benefits | Level 1 | Investments, Including Funds For Retiree Health Benefit | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 57 | 59 |  |
Other Postretirement Benefits | Level 2 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 690 | 710 |  |
Other Postretirement Benefits | Level 2 | Total investments | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 502 | 533 |  |
Other Postretirement Benefits | Level 2 | Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 302 | 331 |  |
Other Postretirement Benefits | Level 2 | Equity | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 205 | 241 |  |
Other Postretirement Benefits | Level 2 | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 323 | 323 |  |
Other Postretirement Benefits | Level 2 | Other Fixed Income Debt | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 233 | 237 |  |
Other Postretirement Benefits | Level 2 | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 27 | 18 |  |
Other Postretirement Benefits | Level 2 | Cash and Cash Equivalents | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 26 | 17 |  |
Other Postretirement Benefits | Level 2 | Commingled Trust Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 38 | 38 |  |
Other Postretirement Benefits | Level 2 | Commingled Trust Fund | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 38 | 38 |  |
Other Postretirement Benefits | Level 2 | Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 90 | 96 |  |
Other Postretirement Benefits | Level 2 | Funds For Retiree Health Benefits | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 90 | 96 |  |
Other Postretirement Benefits | Level 2 | Investments, Including Funds For Retiree Health Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 780 | 806 |  |
Other Postretirement Benefits | Level 2 | Investments, Including Funds For Retiree Health Benefit | CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | $ 592 | $ 629 |  |

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