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Environmental Matters (Tables)
 3 Months Ended
Mar. 31, 2022
Environmental Remediation Obligations [Abstract]  
Accrued Liabilities and Regulatory Assets
The accrued liabilities and regulatory assets related to Superfund Sites at March 31, 2022 and December 31, 2021 were as follows:
        Con Edison        CECONY
(Millions of Dollars)2022202120222021
Accrued Liabilities:
Manufactured gas plant sites$840$845$750$755
Other Superfund Sites94959395
Total$934$940$843$850
Regulatory assets$933$938$854$860
Environmental Remediation Costs Environmental remediation costs incurred related to Superfund Sites for the three months ended March 31, 2022 and 2021 were as follows: 
For the Three Months Ended March 31,
          Con Edison     CECONY
(Millions of Dollars)2022202120222021
Remediation costs incurred$8$8$7$8
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, 2022 and December 31, 2021 were as follows:
          Con Edison     CECONY
(Millions of Dollars)2022202120222021
Accrued liability – asbestos suits$8$8$7$7
Regulatory assets – asbestos suits$8$8$7$7
Accrued liability – workers’ compensation$63$65$60$62
Regulatory liabilities – workers’ compensation$10$8$10$8