Other Postretirement Benefits (Tables) (Other Postretirement Benefits [Member])

9 Months Ended

Sep. 30, 2011

Other Postretirement Benefits [Member]

Net Periodic Postretirement Benefit Costs

	For the Three Months Ended September 30,
	Con Edison						CECONY
(Millions of Dollars)	2011			2010			2011			2010
Service cost	$	7		$	6		$	5		$	5
Interest cost on accumulated other postretirement benefit obligation		20			23			18			20
Expected return on plan assets		(22	)		(22	)		(21	)		(19	)
Amortization of net actuarial loss		22			23			20			21
Amortization of prior service cost		(3	)		(3	)		(3	)		(4	)
Amortization of transition obligation		1			1			1			1
NET PERIODIC POSTRETIREMENT BENEFIT COST	$	25		$	28		$	20		$	24
Cost capitalized		(9	)		(10	)		(7	)		(8	)
Cost deferred		3			2			3			1
Cost charged to operating expenses	$	19		$	20		$	16		$	17
	For the Nine Months Ended September 30,
	Con Edison						CECONY
(Millions of Dollars)	2011			2010			2011			2010
Service cost	$	19		$	18		$	15		$	15
Interest cost on accumulated other postretirement benefit obligation		62			69			54			60
Expected return on plan assets		(66	)		(66	)		(59	)		(57	)
Amortization of net actuarial loss		66			69			60			63
Amortization of prior service cost		(7	)		(9	)		(9	)		(12	)
Amortization of transition obligation		3			3			3			3
NET PERIODIC POSTRETIREMENT BENEFIT COST	$	77		$	84		$	64		$	72
Cost capitalized		(27	)		(30	)		(22	)		(25	)
Cost deferred		12			2			10			(1	)
Cost charged to operating expenses	$	62		$	56		$	52		$	46