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

6 Months Ended

Jun. 30, 2011

Other Postretirement Benefits [Member]

Net Periodic Postretirement Benefit Costs

	For the Three Months Ended June 30,
	Con Edison						CECONY
(Millions of Dollars)	2011			2010			2011			2010
Service cost	$	6		$	6		$	5		$	5
Interest cost on accumulated other postretirement benefit obligation		21			23			18			20
Expected return on plan assets		(22	)		(22	)		(19	)		(19	)
Amortization of net actuarial loss		22			23			20			21
Amortization of prior service cost		(2	)		(3	)		(3	)		(4	)
Amortization of transition obligation		1			1			1			1
NET PERIODIC POSTRETIREMENT BENEFIT COST	$	26		$	28		$	22		$	24
Cost capitalized		(9	)		(10	)		(8	)		(8	)
Cost deferred		4			1			4			—
Cost charged to operating expenses	$	21		$	19		$	18		$	16

	For the Six Months Ended June 30,
	Con Edison						CECONY
(Millions of Dollars)	2011			2010			2011			2010
Service cost	$	12		$	12		$	10		$	10
Interest cost on accumulated other postretirement benefit obligation		42			46			36			40
Expected return on plan assets		(44	)		(44	)		(38	)		(38	)
Amortization of net actuarial loss		44			46			40			42
Amortization of prior service cost		(4	)		(6	)		(6	)		(8	)
Amortization of transition obligation		2			2			2			2
NET PERIODIC POSTRETIREMENT BENEFIT COST	$	52		$	56		$	44		$	48
Cost capitalized		(18	)		(20	)		(15	)		(17	)
Cost deferred		9			—			7			(2	)
Cost charged to operating expenses	$	43		$	36		$	36		$	29