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Environmental Matters (Tables) | 12 Months Ended
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Dec. 31, 2020
Environmental Remediation Obligations [Abstract] |
Accrued Liabilities and Regulatory Assets | The accrued liabilities and regulatory assets related to Superfund Sites at December 31, 2020 and 2019 were as follows:
| Con Edison |  | CECONY
(Millions of Dollars) | 2020 |  | 2019 |  | 2020 |  | 2019
Accrued Liabilities: |  |  |  |  |  |  |
Manufactured gas plant sites | $752 |  | $640 |  | $676 |  | $561
Other Superfund Sites | 105 |  | 94 |  | 104 |  | 93
Total | $857 |  | $734 |  | $780 |  | $654
Regulatory assets | $865 |  | $732 |  | $791 |  | $647
Environmental Remediation Costs | Environmental remediation costs incurred related to Superfund Sites at December 31, 2020 and 2019 were as follows:
| Con Edison |  | CECONY
(Millions of Dollars) | 2020 |  | 2019 |  | 2020 |  | 2019
Remediation costs incurred | $33 |  | $19 |  | $32 |  | $13
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 for the Companies at December 31, 2020 and 2019 were as follows:
| Con Edison |  | CECONY
(Millions of Dollars) | 2020 |  | 2019 |  | 2020 |  | 2019
Accrued liability – asbestos suits | $8 |  | $8 |  | $7 |  | $7
Regulatory assets – asbestos suits | $8 |  | $8 |  | $7 |  | $7
Accrued liability – workers’ compensation | $72 |  | $78 |  | $68 |  | $73
Regulatory assets/(liabilities) – workers’ compensation | $(3) |  | $3 |  | $(3) |  | $3

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