Pension Benefits (Tables) (Pension Benefits [Member])

9 Months Ended

Sep. 30, 2011

Pension Benefits [Member]

Net Periodic Pension Benefit Costs

	For the Three Months Ended September 30,
	Con Edison						CECONY
(Millions of Dollars)	2011			2010			2011			2010
Service cost – including administrative expenses	$	48		$	42		$	45		$	39
Interest cost on projected benefit obligation		140			139			131			130
Expected return on plan assets		(184	)		(175	)		(174	)		(167	)
Amortization of net actuarial loss		133			106			126			100
Amortization of prior service costs		2			2			—			2
NET PERIODIC BENEFIT COST	$	139		$	114		$	128		$	104
Amortization of regulatory asset		—			—			—			—
TOTAL PERIODIC BENEFIT COST	$	139		$	114		$	128		$	104
Cost capitalized		(45	)		(40	)		(42	)		(36	)
Cost deferred		(11	)		(29	)		(11	)		(29	)
Cost charged to operating expenses	$	83		$	45		$	75		$	39
	For the Nine Months Ended September 30,
	Con Edison						CECONY
(Millions of Dollars)	2011			2010			2011			2010
Service cost – including administrative expenses	$	142		$	126		$	133		$	117
Interest cost on projected benefit obligation		420			417			393			390
Expected return on plan assets		(550	)		(527	)		(524	)		(501	)
Amortization of net actuarial loss		397			318			376			300
Amortization of prior service costs		6			6			4			6
NET PERIODIC BENEFIT COST	$	415		$	340		$	382		$	312
Amortization of regulatory asset*		1			1			1			1
TOTAL PERIODIC BENEFIT COST	$	416		$	341		$	383		$	313
Cost capitalized		(141	)		(118	)		(131	)		(109	)
Cost deferred		(68	)		(85	)		(70	)		(82	)
Cost charged to operating expenses	$	207		$	138		$	182		$	122

* Relates to increases in CECONY's pension obligations of $45 million from a 1999 special retirement program.