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Environmental Matters (Tables)
 12 Months Ended
Dec. 31, 2025
Environmental Remediation Obligations [Abstract]  
Schedule of Accrued Liabilities and Regulatory Assets
The accrued liabilities and regulatory assets related to Superfund Sites at December 31, 2025 and 2024 were as follows:
                    Con Edison                CECONY
(Millions of Dollars)2025202420252024
Accrued Liabilities:
Manufactured gas plant sites$980$941$882$846
Other Superfund Sites99969896
Total$1,079$1,037$980$942
Regulatory assets$1,079$1,038$987$952
Schedule of Environmental Remediation Costs
Environmental remediation costs incurred related to Superfund Sites at December 31, 2025 and 2024 were as follows:
                   Con Edison                 CECONY
(Millions of Dollars)2025202420252024
Remediation costs incurred$23$44$22$44
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 December 31, 2025 and 2024 were as follows:
                  Con Edison               CECONY
(Millions of Dollars)2025202420252024
Accrued liability – asbestos suits$11$8$10$7
Regulatory assets – asbestos suits118107
Accrued liability – workers’ compensation51534951
Regulatory liabilities – workers’ compensation21202120