Consolidated Statement Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
OPERATING ACTIVITIES
Net Income	$ 280	$ 314
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	233	218
Deferred income taxes	68	232
Rate case amortization and accruals	31	19
Common equity component of allowance for funds used during construction		(4)
Net derivative losses/(gains)	31	(37)
Other non-cash items (net)	64	(17)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers, less allowance for uncollectibles	54	(5)
Materials and supplies, including fuel oil and gas in storage	31	103
Other receivables and other current assets	(2)	66
Prepayments	(286)	(217)
Accounts payable	(78)	(154)
Pensions and retiree benefits obligations	253	259
Pensions and retiree benefits contribution	(184)	(491)
Accrued taxes	41	(20)
Accrued interest	52	51
Deferred charges, noncurrent assets and other regulatory assets	(255)	(19)
Deferred credits and other regulatory liabilities	117	67
Other assets		(1)
Other liabilities	(48)	(2)
NET CASH FLOWS FROM OPERATING ACTIVITIES	402	362
INVESTING ACTIVITIES
Utility construction expenditures	(471)	(394)
Cost of removal less salvage	(43)	(39)
Non-utility construction expenditures	(9)	(23)
Proceeds from investment tax credits and grants related to renewable energy investments	6
Net investment in Pilesgrove solar project and other	27
Loan to affiliate		(40)
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(490)	(496)
FINANCING ACTIVITIES
Net proceeds from short-term debt		464
Retirement of long-term debt	(1)	(1)
Issuance of long-term debt	400
Issuance of common shares for stock plans, net of repurchases	(8)	25
Debt issuance costs	(4)
Common stock dividends	(175)	(173)
Preferred stock dividends	(3)	(3)
NET CASH FLOWS FROM FINANCING ACTIVITIES	209	312
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	121	178
BALANCE AT BEGINNING OF PERIOD	648	338
BALANCE AT END OF PERIOD	769	516
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest	89	90
Income taxes		(172)
CECONY [Member]
OPERATING ACTIVITIES
Net Income	276	271
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	218	204
Deferred income taxes	66	207
Rate case amortization and accruals	31	19
Common equity component of allowance for funds used during construction		(3)
Other non-cash items (net)	15	10
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers, less allowance for uncollectibles	43	22
Materials and supplies, including fuel oil and gas in storage	22	84
Other receivables and other current assets	16	(77)
Prepayments	(287)	(291)
Accounts payable	(48)	(119)
Pensions and retiree benefits obligations	209	236
Pensions and retiree benefits contribution	(184)	(491)
Accrued taxes	57	(37)
Accrued interest	42	44
Superfund and environmental remediation costs (net)	(1)
Deferred charges, noncurrent assets and other regulatory assets	(179)	(63)
Deferred credits and other regulatory liabilities	108	52
Other liabilities	(36)	4
NET CASH FLOWS FROM OPERATING ACTIVITIES	368	72
INVESTING ACTIVITIES
Utility construction expenditures	(446)	(376)
Cost of removal less salvage	(41)	(37)
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(487)	(413)
FINANCING ACTIVITIES
Net proceeds from short-term debt		464
Issuance of long-term debt	400
Debt issuance costs	(4)
Dividend to parent	(171)	(170)
Preferred stock dividends	(3)	(3)
NET CASH FLOWS FROM FINANCING ACTIVITIES	222	291
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	103	(50)
BALANCE AT BEGINNING OF PERIOD	372	78
BALANCE AT END OF PERIOD	475	28
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest	83	82
Income taxes	$ (20)	$ 35