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Environmental Matters (Tables)
 9 Months Ended
Sep. 30, 2025
Environmental Remediation Obligations [Abstract]  
Schedule of Accrued Liabilities and Regulatory Assets
The accrued liabilities and regulatory assets related to Superfund Sites at September 30, 2025 and December 31, 2024 were as follows:
        Con Edison        CECONY
(Millions of Dollars)2025202420252024
Accrued Liabilities:
Manufactured gas plant sites$939$941$845$846
Other Superfund Sites90969096
Total$1,029$1,037$935$942
Regulatory assets$1,024$1,038$937$952
Schedule of Environmental Remediation Costs
Environmental investigation and remediation costs incurred related to Superfund Sites for the three and nine months ended September 30, 2025 and 2024 were as follows: 
For the Three Months Ended September 30,
          Con Edison     CECONY
(Millions of Dollars)2025202420252024
Investigation and remediation costs incurred
$—$12$—$12
For the Nine Months Ended September 30,
          Con Edison     CECONY
(Millions of Dollars)2025202420252024
Investigation and remediation costs incurred
$12$27$11$27
Schedule of Accrued Liability for Asbestos Suits and Workers' Compensation Proceedings
The accrued liability for asbestos suits and workers’ compensation proceedings (including those related to asbestos exposure) and the amounts deferred as regulatory assets or liabilities for the Companies at September 30, 2025 and December 31, 2024 were as follows:
          Con Edison     CECONY
(Millions of Dollars)2025202420252024
Accrued liability – asbestos suits$8$8$7$7
Regulatory assets – asbestos suits8877
Accrued liability – workers’ compensation52534951
Regulatory liabilities – workers’ compensation21202120