CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
OPERATING ACTIVITIES
NET INCOME	$ 364	$ 494
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	506	469
Deferred income taxes	(134)	146
Rate case amortization and accruals	19	22
Common equity component of allowance for funds used during construction	(1)	(2)
Net derivative (gains)/losses	30	(31)
Pre-tax gain on the termination of a LILO transaction	(49)
Other non-cash items (net)	154	(85)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers, less allowance for uncollectibles	11	89
Special deposits	(335)
Materials and supplies, including fuel oil and gas in storage	9	19
Other receivables and other current assets	2	17
Prepayments	40	(6)
Accounts payable	(121)	(89)
Pensions and retiree benefits obligations	467	483
Pensions and retiree benefits contributions	(361)	(450)
Superfund and environmental remediation costs (net)	(6)	1
Accrued taxes	160	(34)
Accrued interest	124	19
Deferred charges, noncurrent assets and other regulatory assets	(34)	116
Deferred credits and other regulatory liabilities	79	73
Other assets	66
Other liabilities	(17)	(4)
NET CASH FLOWS FROM OPERATING ACTIVITIES	973	1,247
INVESTING ACTIVITIES
Utility construction expenditures	(1,114)	(1,030)
Cost of removal less salvage	(93)	(85)
Non-utility construction expenditures	(129)	(43)
Increase in restricted cash	(2)
Proceeds from grants related to renewable energy investments	18	25
Net investment in Pilesgrove solar project and other		28
Proceeds from the termination of a LILO transaction	108
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,212)	(1,105)
FINANCING ACTIVITIES
Net proceeds of short-term debt	753	800
Preferred stock redemption		(239)
Issuance of long-term debt	919	400
Retirement of long-term debt	(706)	(2)
Issuance of common shares for stock plans, net of repurchases	(2)	(12)
Debt issuance costs	(12)	(4)
Common stock dividends	(360)	(349)
Preferred stock dividends		(3)
NET CASH FLOWS FROM FINANCING ACTIVITIES	592	591
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	353	733
BALANCE AT BEGINNING OF PERIOD	394	648
BALANCE AT END OF PERIOD	747	1,381
Cash paid during the period for:
Interest	281	281
Income taxes	27	45
CECONY [Member]
OPERATING ACTIVITIES
NET INCOME	430	439
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	468	439
Deferred income taxes	191	106
Rate case amortization and accruals	19	22
Common equity component of allowance for funds used during construction	(1)	(1)
Other non-cash items (net)	(25)	(37)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers, less allowance for uncollectibles	22	63
Materials and supplies, including fuel oil and gas in storage	2	18
Other receivables and other current assets	18	(8)
Prepayments	(8)	5
Accounts payable	(119)	(57)
Pensions and retiree benefits obligations	435	422
Pensions and retiree benefits contributions	(361)	(450)
Superfund and environmental remediation costs (net)	(4)	(1)
Accrued taxes	(114)	(3)
Accrued interest	4	7
Deferred charges, noncurrent assets and other regulatory assets	(11)	59
Deferred credits and other regulatory liabilities	68	70
Other liabilities	29	12
NET CASH FLOWS FROM OPERATING ACTIVITIES	1,043	1,105
INVESTING ACTIVITIES
Utility construction expenditures	(1,062)	(974)
Cost of removal less salvage	(89)	(83)
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,151)	(1,057)
FINANCING ACTIVITIES
Net proceeds of short-term debt	809	800
Preferred stock redemption		(239)
Issuance of long-term debt	700	400
Retirement of long-term debt	(700)
Debt issuance costs	(7)	(4)
Dividend to parent	(364)	(341)
Preferred stock dividends		(3)
NET CASH FLOWS FROM FINANCING ACTIVITIES	438	613
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	330	661
BALANCE AT BEGINNING OF PERIOD	353	372
BALANCE AT END OF PERIOD	683	1,033
Cash paid during the period for:
Interest	251	252
Income taxes	$ 104	$ 45