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Environmental Matters (Tables)
 3 Months Ended
Mar. 31, 2026
Environmental Remediation Obligations [Abstract]  
Schedule of Accrued Liabilities and Regulatory Assets
The accrued liabilities and regulatory assets related to Superfund Sites at March 31, 2026 and December 31, 2025 were as follows:
        Con Edison        CECONY
(Millions of Dollars)2026202520262025
Accrued Liabilities:
Manufactured gas plant sites$978$980$881$882
Other Superfund Sites1039910298
Total$1,081$1,079$983$980
Regulatory assets$1,082$1,079$990$987
Schedule of Environmental Remediation Costs
Environmental remediation costs incurred related to Superfund Sites for the three months ended March 31, 2026 and 2025 were as follows: 
For the Three Months Ended March 31,
Con EdisonCECONY
(Millions of Dollars)2026202520262025
Remediation costs incurred$3$9$3$9
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 March 31, 2026 and December 31, 2025 were as follows:
          Con Edison     CECONY
(Millions of Dollars)2026202520262025
Accrued liability – asbestos suits$11$11$10$10
Regulatory assets – asbestos suits11111010
Accrued liability – workers’ compensation$51$51$49$49
Regulatory liabilities – workers’ compensation21212121