Consolidated Statement of Capitalization (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Pension plan liability adjustments, tax	$ (10)	$ (30)
Unrealized gains/(losses) on derivatives qualified as cash flow hedges, tax and reclassification adjustment	(2)	(2)
CECONY [Member]
Pension plan liability adjustments, tax	(2)	(4)
Unrealized gains/(losses) on derivatives qualified as cash flow hedges, tax and reclassification adjustment	$ (2)	$ (2)