Consolidated Statement Of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net Income	$ 440	$ 386	$ 934	$ 869
OTHER COMPREHENSIVE INCOME, NET OF TAXES
Pension plan liability adjustments, net of $(1) taxes in 2012	2	2	8	7
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	2	2	8	7
COMPREHENSIVE INCOME	442	388	942	876
Preferred stock dividend requirements of subsidiary		(3)	(3)	(9)
COMPREHENSIVE INCOME FOR COMMON STOCK	442	385	939	867
CECONY [Member]
Net Income	389	356	827	788
OTHER COMPREHENSIVE INCOME, NET OF TAXES
Pension plan liability adjustments, net of $(1) taxes in 2012			(2)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES			(2)
COMPREHENSIVE INCOME	389	356	825	788
Preferred stock dividend requirements of subsidiary		$ (3)