Environmental Matters (Tables)

12 Months Ended

Dec. 31, 2017

Environmental Remediation Obligations [Abstract]

Accrued Liabilities and Regulatory Assets

The accrued liabilities and regulatory assets related to Superfund Sites at December 31, 2017 and 2016 were as follows:

	Con Edison		CECONY
(Millions of Dollars)	2017	2016	2017	2016
Accrued Liabilities:
Manufactured gas plant sites	$651	$664	$551	$567
Other Superfund Sites	86	89	86	88
Total	$737	$753	$637	$655
Regulatory assets	$793	$823	$677	$711

Environmental Remediation Costs

Environmental remediation costs incurred related to Superfund Sites at December 31, 2017 and 2016 were as follows:

	Con Edison		CECONY
(Millions of Dollars)	2017	2016	2017	2016
Remediation costs incurred	$24	$34	$19	$21

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, 2017 and 2016 were as follows:

	Con Edison		CECONY
(Millions of Dollars)	2017	2016	2017	2016
Accrued liability – asbestos suits	$8	$8	$7	$7
Regulatory assets – asbestos suits	$8	$8	$7	$7
Accrued liability – workers’ compensation	$84	$88	$80	$83
Regulatory assets – workers’ compensation	$10	$13	$10	$13