Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OPERATING ACTIVITIES
Net income	$ 1,382	$ 1,525	$ 1,245
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	1,438	1,341	1,216
Deferred income taxes	408	485	783
Rate case amortization and accruals	(117)	(124)	(210)
Common equity component of allowance for funds used during construction	(12)	(11)	(10)
Net derivative (gains)/losses	8	(4)	(6)
Unbilled revenue and net unbilled revenue deferrals	18	(113)	(71)
(Gain) on sale of retail electric supply business and solar electric production projects	0	(1)	(104)
(Gain) on acquisition of Sempra Solar Holdings, LLC	(131)	0	0
Other non-cash items, net	115	5	198
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers	(140)	9	(69)
Materials and supplies, including fuel oil and gas in storage	(20)	5	13
Other receivables and other current assets	(62)	0	69
Taxes receivable	27	15	87
Prepayments	(7)	(19)	20
Accounts payable	(46)	95	29
Pensions and retiree benefits obligations, net	325	414	609
Pensions and retiree benefits contributions	(479)	(467)	(515)
Accrued taxes	(49)	44	2
Accrued interest	(35)	(7)	14
Superfund and environmental remediation costs, net	(19)	(14)	69
Distributions from equity investments	107	108	68
System benefit charge	92	101	244
Deferred charges, noncurrent assets and other regulatory assets	(393)	2,376	(97)
Deferred credits and other regulatory liabilities	436	(2,524)	(68)
Other current and noncurrent liabilities	(151)	128	(57)
NET CASH FLOWS FROM OPERATING ACTIVITIES	2,695	3,367	3,459
INVESTING ACTIVITIES
Utility construction expenditures	(3,251)	(3,028)	(2,835)
Cost of removal less salvage	(258)	(248)	(206)
Non-utility construction expenditures	(246)	(415)	(845)
Acquisition of Sempra Solar Holdings, LLC, net of cash acquired	(1,488)	0	0
Proceeds from sale of assets	5	34	252
Proceeds from the transfer of assets to NY Transco	0	0	122
Other investing activities	34	37	31
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(5,471)	(3,710)	(4,950)
FINANCING ACTIVITIES
Net (payment)/issuance of short-term debt	1,989	(477)	(475)
Issuance of long-term debt	3,030	1,697	2,590
Retirement of long-term debt	(1,938)	(434)	(735)
Debt issuance costs	(61)	(19)	(24)
Common stock dividends	(842)	(803)	(763)
Issuance of common shares - public offering	705	343	702
Issuance of common shares for stock plans	53	51	51
Distribution to noncontrolling interest	2	(1)	(1)
NET CASH FLOWS FROM FINANCING ACTIVITIES	2,938	357	1,345
CASH, TEMPORARY CASH INVESTMENTS AND RESTRICTED CASH:
NET CHANGE FOR THE PERIOD	162	14	(146)
BALANCE AT BEGINNING OF PERIOD		826	972
BALANCE AT END OF PERIOD			826
LESS: CHANGE IN CASH BALANCES HELD FOR SALE			(4)
BALANCE AT BEGINNING OF PERIOD	844	830
BALANCE AT END OF PERIOD EXCLUDING HELD FOR SALE	1,006	844	830
Cash paid/(received) during the period for:
Interest	805	725	664
Income taxes	0	(29)	(180)
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	369	432	388
Issuance of common shares for dividend reinvestment	47	46	46
Debt assumed with business acquisitions	568	0	195
Software licenses acquired but unpaid as of end of period	100	0	0
Electric and Gas Transmission Projects
INVESTING ACTIVITIES
Investments in/acquisitions of projects	(248)	(45)	(1,076)
Renewable Electric Production Projects
INVESTING ACTIVITIES
Investments in/acquisitions of projects	(19)	(45)	(393)
CECONY
OPERATING ACTIVITIES
Net income	1,196	1,104	1,056
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	1,276	1,195	1,106
Deferred income taxes	354	575	545
Rate case amortization and accruals	(133)	(142)	(227)
Common equity component of allowance for funds used during construction	(11)	(10)	(8)
Unbilled revenue and net unbilled revenue deferrals	(4)	(17)	(36)
Other non-cash items, net	13	(59)	5
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers	(153)	15	(23)
Materials and supplies, including fuel oil and gas in storage	(17)	(17)	18
Other receivables and other current assets	(96)	23	(11)
Accounts receivables from affiliated companies	(150)	45	81
Prepayments	(9)	(8)	13
Accounts payable	(27)	125	20
Accounts payable to affiliated companies	7	0	(2)
Pensions and retiree benefits obligations, net	293	370	579
Pensions and retiree benefits contributions	(440)	(420)	(476)
Accrued taxes	(47)	52	1
Accrued taxes to affiliated companies	(72)	(47)	117
Accrued interest	(1)	2	(7)
Superfund and environmental remediation costs, net	(18)	(12)	79
System benefit charge	86	85	221
Deferred charges, noncurrent assets and other regulatory assets	(314)	2,212	(172)
Deferred credits and other regulatory liabilities	549	(2,242)	179
Other current and noncurrent liabilities	(78)	37	(20)
NET CASH FLOWS FROM OPERATING ACTIVITIES	2,204	2,866	3,038
INVESTING ACTIVITIES
Utility construction expenditures	(3,051)	(2,840)	(2,672)
Cost of removal less salvage	(255)	(240)	(203)
Proceeds from the transfer of assets to NY Transco	0	0	122
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(3,306)	(3,080)	(2,753)
FINANCING ACTIVITIES
Net (payment)/issuance of short-term debt	1,042	(450)	(433)
Issuance of long-term debt	2,740	1,200	1,300
Retirement of long-term debt	(1,836)	0	(650)
Debt issuance costs	(30)	(15)	(13)
Capital contribution by parent	120	301	100
Dividend to parent	(846)	(796)	(744)
NET CASH FLOWS FROM FINANCING ACTIVITIES	1,190	240	(440)
CASH, TEMPORARY CASH INVESTMENTS AND RESTRICTED CASH:
NET CHANGE FOR THE PERIOD	88	26	(155)
BALANCE AT BEGINNING OF PERIOD	730	704	859
BALANCE AT END OF PERIOD EXCLUDING HELD FOR SALE	818	730	704
Cash paid/(received) during the period for:
Interest	662	602	581
Income taxes	195	108	(162)
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	299	351	295
Software licenses acquired but unpaid as of end of period	$ 95	$ 0	$ 0