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Environmental Matters (Tables) | 3 Months Ended
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Mar. 31, 2021
Environmental Remediation Obligations [Abstract] |
Accrued Liabilities and Regulatory Assets | The accrued liabilities and regulatory assets related to Superfund Sites at March 31, 2021 and December 31, 2020 were as follows:
| Con Edison | CECONY
(Millions of Dollars) | 2021 | 2020 | 2021 | 2020
Accrued Liabilities: |  |  |  |
Manufactured gas plant sites | $745 | $752 | $669 | $676
Other Superfund Sites | 105 | 105 | 104 | 104
Total | $850 | $857 | $773 | $780
Regulatory assets | $858 | $865 | $786 | $791
Environmental Remediation Costs | Environmental remediation costs incurred related to Superfund Sites for the three months ended March 31, 2021 and 2020 were as follows:
| For the Three Months Ended March 31,
| Con Edison | CECONY
(Millions of Dollars) | 2021 | 2020 | 2021 | 2020
Remediation costs incurred | $8 | $5 | $8 | $5
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 liabilities for the Companies at March 31, 2021 and December 31, 2020 were as follows:
| Con Edison | CECONY
(Millions of Dollars) | 2021 | 2020 | 2021 | 2020
Accrued liability – asbestos suits | $8 | $8 | $7 | $7
Regulatory assets – asbestos suits | $8 | $8 | $7 | $7
Accrued liability – workers’ compensation | $72 | $72 | $67 | $68
Regulatory liability – workers’ compensation | $3 | $3 | $3 | $3

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