Other Material Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Summary of Total Guarantees

A summary, by type and term, of Con Edison’s total guarantees at December 31, 2017 is as follows:

Guarantee Type	0 – 3 years	4 – 10 years	> 10 years		Total
	(Millions of Dollars)
Con Edison Transmission	$643	$404		$—	$1,047
Energy transactions	431	27	211		669
Renewable electric production projects	210	—	24		234
Other	123	—	—		123
Total	$1,407	$431	$235		$2,073