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Environmental Matters (Tables)
 3 Months Ended
Mar. 31, 2024
Environmental Remediation Obligations [Abstract]  
Accrued Liabilities and Regulatory Assets
The accrued liabilities and regulatory assets related to Superfund Sites at March 31, 2024 and December 31, 2023 were as follows:
        Con Edison        CECONY
(Millions of Dollars)2024202320242023
Accrued Liabilities:
Manufactured gas plant sites$1,013$1,016$922$924
Other Superfund Sites9910298102
Total$1,112$1,118$1,020$1,026
Regulatory assets$1,098$1,105$1,015$1,022
Environmental Remediation Costs
Environmental remediation costs incurred related to Superfund Sites for the three months ended March 31, 2024 and 2023 were as follows: 
For the Three Months Ended March 31,
          Con Edison     CECONY
(Millions of Dollars)2024202320242023
Remediation costs incurred$7$3$6$3
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, 2024 and December 31, 2023 were as follows:
          Con Edison     CECONY
(Millions of Dollars)2024202320242023
Accrued liability – asbestos suits$8$8$7$7
Regulatory assets – asbestos suits$8$8$7$7
Accrued liability – workers’ compensation$57$56$55$54
Regulatory liabilities – workers’ compensation$15$17$15$17