Consolidated Statement Of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
OPERATING ACTIVITIES
Net Income	$ 1,062		$ 1,003		$ 879
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	884		840		791
Deferred income taxes	491		659		436
Rate case amortization and accruals	49		13		(63)
Common equity component of allowance for funds used during construction	(11)		(15)		(14)
Net derivative (gains)/losses	22		(19)		(31)
Other non-cash items (net)	144		(18)		(77)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers, less allowance for uncollectibles	50		(126)		51
Materials and supplies, including fuel oil and gas in storage	(8)		7		161
Other receivables and other current assets	51		207		(346)
Prepayments	196		(210)		566
Recoverable energy costs					90
Accounts payable	(195)		(22)		(18)
Pensions and retiree benefits	151		78		(14)
Superfund and environmental remediation costs (net)	(9)		(3)		(48)
Accrued taxes	98		38		(6)
Accrued interest	5		(1)		17
Deferred charges, noncurrent assets and other regulatory assets	(139)		(287)		122
Deferred credits and other regulatory liabilities	234		80		(23)
Other assets			(9)		(5)
Other liabilities	62		166		(2)
NET CASH FLOWS FROM OPERATING ACTIVITIES	3,137		2,381		2,466
INVESTING ACTIVITIES
Utility construction expenditures	(1,887)		(1,986)		(2,170)
Cost of removal less salvage	(167)		(149)		(181)
Non-utility construction expenditures	(80)		(28)		(9)
Proceeds from investment tax credits and grants related to renewable energy investments	4
Net investment in Pilesgrove solar project	(20)
Purchase of additional ownership interest in Honeoye Storage Corporation			(12)
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(2,150)		(2,175)		(2,360)
FINANCING ACTIVITIES
Net payments of short-term debt					(363)
Issuance of long-term debt			1,095		1,470
Retirement of long-term debt	(4)		(1,011)		(662)
Issuance of common stock	118		439		257
Repurchase of common stock	(87)
Debt issuance costs			(11)		(10)
Common stock dividends	(693)		(629)		(601)
Preferred stock dividends	(11)		(11)		(11)
NET CASH FLOWS (USED IN)/FROM FINANCING ACTIVITIES	(677)		(128)		80
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	310		78		186
BALANCE AT BEGINNING OF PERIOD	338		260		74
BALANCE AT END OF PERIOD	648		338		260
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest	563		583		558
Income taxes	(236)		(25)		5
CECONY [Member]
OPERATING ACTIVITIES
Net Income	989		904		792
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	829		787		744
Deferred income taxes	462		622		364
Rate case amortization and accruals	49		13		(63)
Common equity component of allowance for funds used during construction	(8)		(13)		(12)
Other non-cash items (net)	96		(12)		(56)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers, less allowance for uncollectibles	48		(121)		33
Materials and supplies, including fuel oil and gas in storage	(2)		4		133
Other receivables and other current assets	170		11		(122)
Prepayments	(3)				456
Recoverable energy costs					111
Accounts payable	(132)		(17)		(118)
Pensions and retiree benefits	102		68
Superfund and environmental remediation costs (net)	(9)		(8)		(51)
Accrued taxes	95		13		(16)
Accrued interest	3		(7)		6
Deferred charges, noncurrent assets and other regulatory assets	(32)		(294)		71
Deferred credits and other regulatory liabilities	224		70		(25)
Other liabilities	52		185		(25)
NET CASH FLOWS FROM OPERATING ACTIVITIES	2,933		2,205		2,222
INVESTING ACTIVITIES
Utility construction expenditures	(1,785)		(1,853)		(2,045)
Cost of removal less salvage	(162)		(145)		(176)
Loan to affiliate					113
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,947)		(1,998)		(2,108)
FINANCING ACTIVITIES
Net payments of short-term debt					(253)
Issuance of long-term debt			925		1,350
Retirement of long-term debt			(850)		(655)
Debt issuance costs			(9)		(10)
Capital contribution by parent			355		211
Dividend to parent	(681)		(670)		(652)
Common stock dividends	(681)	[1]	(670)	[1]	(652)	[1]
Preferred stock dividends	(11)		(11)		(11)
NET CASH FLOWS (USED IN)/FROM FINANCING ACTIVITIES	(692)		(260)		(20)
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	294		(53)		94
BALANCE AT BEGINNING OF PERIOD	78		131		37
BALANCE AT END OF PERIOD	372		78		131
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest	504		528		513
Income taxes	$ (198)		$ (18)		$ 18

[1] These financial statements, in which Con Edison's subsidiaries have been included using the equity method, should be read together with its consolidated financial statements and the notes thereto appearing above.