Consolidated Statement Of Cash Flows (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
OPERATING ACTIVITIES
Net Income	$ 869	$ 768
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	659	626
Deferred income taxes	368	562
Common equity component of allowance for funds used during construction	(8)	(13)
Net derivative (gains)/losses	(25)	35
Other non-cash items (net)	45	(8)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers, less allowance for uncollectibles	(4)	(114)
Materials and supplies, including fuel oil and gas in storage	(27)	(9)
Other receivables and other current assets	70	(114)
Prepayments	(128)	(473)
Accounts payable	(50)	(105)
Pensions and retiree benefits	(1)	(33)
Accrued taxes	76	63
Accrued interest	57	45
Deferred charges, deferred derivative losses, noncurrent assets and other regulatory assets	92	(472)
Deferred credits and other regulatory liabilities	158	142
Other assets		(8)
Other liabilities	10	82
NET CASH FLOWS FROM OPERATING ACTIVITIES	2,161	974
INVESTING ACTIVITIES
Utility construction expenditures	(1,412)	(1,455)
Cost of removal less salvage	(123)	(103)
Non-utility construction expenditures	(57)	(6)
Proceeds from investment tax credits and grants related to renewable energy investments	4
Net investment in Pilesgrove solar project	(31)	(3)
Common equity component of allowance for funds used during construction	8	13
Purchase of additional ownership interest in Honeoye Storage Corporation		(12)
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,611)	(1,566)
FINANCING ACTIVITIES
Net proceeds from short-term debt		846
Issuance of long-term debt		870
Retirement of long-term debt	(3)	(781)
Issuance of common stock	81	78
Repurchase of common stock	(40)
Debt issuance costs		(6)
Common stock dividends	(519)	(468)
Preferred stock dividends	(9)	(9)
NET CASH FLOWS (USED IN)/FROM FINANCING ACTIVITIES	(490)	530
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	60	(62)
BALANCE AT BEGINNING OF PERIOD	338	260
BALANCE AT END OF PERIOD	398	198
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest	371	394
Income taxes	(132)	284
CECONY [Member]
OPERATING ACTIVITIES
Net Income	788	717
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	618	586
Deferred income taxes	309	562
Common equity component of allowance for funds used during construction	(6)	(10)
Other non-cash items (net)	98	(88)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers, less allowance for uncollectibles	3	(84)
Materials and supplies, including fuel oil and gas in storage	2	(9)
Other receivables and other current assets	243	(208)
Prepayments	(303)	(309)
Accounts payable	(45)	(96)
Pensions and retiree benefits	(5)	(30)
Accrued taxes	(7)	20
Accrued interest	46	37
Deferred charges, deferred derivative losses, noncurrent assets and other regulatory assets	33	(374)
Deferred credits and other regulatory liabilities	167	131
Other liabilities	19	93
NET CASH FLOWS FROM OPERATING ACTIVITIES	1,960	938
INVESTING ACTIVITIES
Utility construction expenditures	(1,338)	(1,371)
Cost of removal less salvage	(118)	(100)
Common equity component of allowance for funds used during construction	6	10
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,450)	(1,461)
FINANCING ACTIVITIES
Net proceeds from short-term debt		832
Issuance of long-term debt		700
Retirement of long-term debt		(625)
Debt issuance costs		(6)
Capital contribution by parent		36
Dividend to parent	(509)	(502)
Preferred stock dividends	(9)	(8)
NET CASH FLOWS (USED IN)/FROM FINANCING ACTIVITIES	(518)	427
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	(8)	(96)
BALANCE AT BEGINNING OF PERIOD	78	131
BALANCE AT END OF PERIOD	70	35
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest	336	357
Income taxes	$ (103)	$ 263