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Environmental Matters (Tables) | 12 Months Ended
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Dec. 31, 2019
Environmental Remediation Obligations [Abstract] |
Accrued Liabilities and Regulatory Assets | The accrued liabilities and regulatory assets related to Superfund Sites at December 31, 2019 and 2018 were as follows:
| Con Edison |  | CECONY
(Millions of Dollars) | 2019 |  | 2018 |  | 2019 |  | 2018
Accrued Liabilities: |  |  |  |  |  |  |
Manufactured gas plant sites | $640 |  | $689 |  | $561 |  | $603
Other Superfund Sites | 94 |  | 90 |  | 93 |  | 90
Total | $734 |  | $779 |  | $654 |  | $693
Regulatory assets | $732 |  | $810 |  | $647 |  | $716
Environmental Remediation Costs | Environmental remediation costs incurred related to Superfund Sites at December 31, 2019 and 2018 were as follows:
| Con Edison |  | CECONY
(Millions of Dollars) | 2019 |  | 2018 |  | 2019 |  | 2018
Remediation costs incurred | $19 |  | $25 |  | $13 |  | $18
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, 2019 and 2018 were as follows:
| Con Edison |  | CECONY
(Millions of Dollars) | 2019 |  | 2018 |  | 2019 |  | 2018
Accrued liability – asbestos suits | $8 |  | $8 |  | $7 |  | $7
Regulatory assets – asbestos suits | $8 |  | $8 |  | $7 |  | $7
Accrued liability – workers’ compensation | $78 |  | $79 |  | $73 |  | $75
Regulatory assets – workers’ compensation | $3 |  | $5 |  | $3 |  | $5

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