Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
NET INCOME	$ 1,092	$ 1,062	$ 1,141
OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAXES
Pension and other postretirement benefit plan liability adjustments, net of taxes	(20)	28	5
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAXES	(20)	28	5
COMPREHENSIVE INCOME	1,072	1,090	1,146
Cumulative preferred dividends			(3)
COMPREHENSIVE INCOME FOR COMMON STOCK	1,072	1,090	1,143
CECONY [Member]
NET INCOME	1,058	1,020	1,017
OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAXES
Pension and other postretirement benefit plan liability adjustments, net of taxes	(5)	3	(1)
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAXES	(5)	3	(1)
COMPREHENSIVE INCOME	1,053	1,023	1,016
Cumulative preferred dividends			$ (3)