Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OPERATING ACTIVITIES
Net income	$ 1,245	$ 1,193	$ 1,092
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	1,216	1,130	1,071
Deferred income taxes	783	653	518
Rate case amortization and accruals	(210)	(52)	121
Common equity component of allowance for funds used during construction	(10)	(5)	(2)
Net derivative (gains)/losses	(6)	3	128
Pre-tax gain on sale of retail electric supply business and solar electric production projects	(104)	0	(45)
Other non-cash items, net	142	77	(35)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers	(69)	96	44
Materials and supplies, including fuel oil and gas in storage	13	22	(10)
Other receivables and other current assets	54	(27)	316
Income taxes receivable	87	58	(224)
Prepayments	20	(14)	(27)
Accounts payable	29	(79)	(9)
Pensions and retiree benefits obligations, net	609	756	822
Pensions and retiree benefits contributions	(515)	(756)	(584)
Accrued taxes	2	(10)	(404)
Accrued interest	14	4	(113)
Superfund and environmental remediation costs, net	69	22	28
Distributions from equity investments	68	31	0
System benefit charge	244	38	(37)
Deferred charges, noncurrent assets and other regulatory assets	(97)	(111)	(361)
Deferred credits and other regulatory liabilities	(68)	182	498
Other current and noncurrent liabilities	(57)	66	44
NET CASH FLOWS FROM OPERATING ACTIVITIES	3,459	3,277	2,831
INVESTING ACTIVITIES
Utility construction expenditures	(2,835)	(2,562)	(2,239)
Cost of removal less salvage	(206)	(219)	(216)
Non-utility construction expenditures	(845)	(492)	(180)
Proceeds from grants related to solar electric production projects	0	0	36
Proceeds from sale of assets	252	0	108
Restricted cash	(17)	(13)	15
Proceeds from the transfer of assets to NY Transco	122	0	0
Other investing activities	31	(72)	10
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(4,976)	(3,657)	(2,759)
FINANCING ACTIVITIES
Net (payment)/issuance of short-term debt	(475)	729	(651)
Issuance of long-term debt	2,590	1,147	1,850
Retirement of long-term debt	(735)	(500)	(480)
Debt issuance costs	(24)	(15)	(17)
Common stock dividends	(763)	(733)	(739)
Issuance of common shares - public offering	702	0	0
Issuance of common shares for stock plans, net of repurchases	51	1	(10)
Distribution to noncontrolling interest	(1)	0	0
NET CASH FLOWS FROM/(USED IN) FINANCING ACTIVITIES	1,345	629	(47)
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	(172)	249	25
BALANCE AT BEGINNING OF PERIOD	944	699	674
BALANCE AT END OF PERIOD	772	948	699
LESS: CHANGE IN CASH BALANCES HELD FOR SALE	(4)	4	0
BALANCE AT END OF PERIOD EXCLUDING HELD FOR SALE	776	944	699
Cash paid/(received) during the period for:
Interest	664	597	561
Income taxes	(180)	(36)	633
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	388	279	179
Issuance of common shares for dividend reinvestment	46	28	11
Debt assumed with business acquisitions	195	0	0
Electric and Gas Transmission Projects
INVESTING ACTIVITIES
Investments in/acquisitions of projects	(1,076)	0	0
Renewable Electric Production Projects
INVESTING ACTIVITIES
Investments in/acquisitions of projects	(402)	(299)	(293)
CECONY
OPERATING ACTIVITIES
Net income	1,056	1,084	1,058
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	1,106	1,040	991
Deferred income taxes	545	449	331
Rate case amortization and accruals	(227)	(74)	102
Common equity component of allowance for funds used during construction	(8)	(4)	(1)
Other non-cash items, net	(31)	(27)	(33)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers	(23)	87	59
Materials and supplies, including fuel oil and gas in storage	18	24	(12)
Other receivables and other current assets	(11)	38	48
Accounts receivables from affiliated companies	81	(58)	(13)
Prepayments	13	13	(24)
Accounts payable	20	(51)	(57)
Accounts payable to affiliated companies	(2)	(11)	(22)
Pensions and retiree benefits obligations, net	579	714	742
Pensions and retiree benefits contributions	(476)	(703)	(544)
Accrued taxes	1	3	0
Accrued taxes to affiliated companies	117	(8)	(403)
Accrued interest	(7)	1	(22)
Superfund and environmental remediation costs, net	79	19	32
System benefit charge	221	38	(38)
Deferred charges, noncurrent assets and other regulatory assets	(172)	(150)	(334)
Deferred credits and other regulatory liabilities	179	379	475
Other current and noncurrent liabilities	(20)	16	95
NET CASH FLOWS FROM OPERATING ACTIVITIES	3,038	2,819	2,430
INVESTING ACTIVITIES
Utility construction expenditures	(2,672)	(2,410)	(2,094)
Cost of removal less salvage	(203)	(212)	(210)
Restricted cash	14	(16)	0
Proceeds from the transfer of assets to NY Transco	122	0	0
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(2,739)	(2,638)	(2,304)
FINANCING ACTIVITIES
Net (payment)/issuance of short-term debt	(433)	583	(760)
Issuance of long-term debt	1,300	650	1,850
Retirement of long-term debt	(650)	(350)	(475)
Debt issuance costs	(13)	(7)	(17)
Capital contribution by parent	100	13	0
Dividend to parent	(744)	(872)	(712)
NET CASH FLOWS FROM/(USED IN) FINANCING ACTIVITIES	(440)	17	(114)
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	(141)	198	12
BALANCE AT BEGINNING OF PERIOD	843	645	633
BALANCE AT END OF PERIOD EXCLUDING HELD FOR SALE	702	843	645
Cash paid/(received) during the period for:
Interest	581	554	504
Income taxes	(162)	163	748
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	$ 295	$ 210	$ 151