Consolidated Edison Co Of New York 10-Q 1 Aug 19 2019 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	1-14514
Entity Registrant Name	Consolidated Edison, Inc.
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001047862
Current Fiscal Year End Date	--12-31
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	13-3965100
Entity Address, Address Line One	4 Irving Place,
Entity Address, City or Town	New York,
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10003
City Area Code	(212)
Local Phone Number	460-4600
Title of 12(b) Security	Common Shares ($.10 par value)
Trading Symbol	ED
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		332,144,207
CECONY
Document Information [Line Items]
Entity File Number	1-1217
Entity Registrant Name	Consolidated Edison Company of New York, Inc.
Entity Central Index Key	0000023632
Current Fiscal Year End Date	--12-31
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	13-5009340
Entity Address, Address Line One	4 Irving Place,
Entity Address, City or Town	New York,
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10003
City Area Code	(212)
Local Phone Number	460-4600
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false

Consolidated Income Statement (

Consolidated Income Statement (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
OPERATING REVENUES
Total operating revenues	$ 2,744	$ 2,696	$ 6,258	$ 6,060
OPERATING EXPENSES
Depreciation and amortization	418	354	831	702
Taxes, other than income taxes	578	540	1,183	1,110
TOTAL OPERATING EXPENSES	2,286	2,270	5,014	4,880
OPERATING INCOME	458	426	1,244	1,180
OTHER INCOME (DEDUCTIONS)
Investment income	22	36	45	57
Other income	4	6	15	11
Allowance for equity funds used during construction	4	3	7	7
Other deductions	(27)	(48)	(50)	(92)
TOTAL OTHER INCOME (DEDUCTIONS)	3	(3)	17	(17)
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	461	423	1,261	1,163
INTEREST EXPENSE
Interest on long-term debt	219	190	440	380
Other interest	47	9	77	16
Allowance for borrowed funds used during construction	(3)	(2)	(7)	(5)
NET INTEREST EXPENSE	263	197	510	391
INCOME BEFORE INCOME TAX EXPENSE	198	226	751	772
INCOME TAX EXPENSE	19	38	127	156
NET INCOME	179	188	624	616
Income attributable to non-controlling interest	27	0	48	0
NET INCOME FOR COMMON STOCK	$ 152	$ 188	$ 576	$ 616
Net income per common share - basic (dollars per share)	$ 0.46	$ 0.60	$ 1.77	$ 1.98
Net income per common share - diluted (dollars per share)	$ 0.46	$ 0.60	$ 1.77	$ 1.98
AVERAGE NUMBER OF SHARES OUTSTANDING-BASIC (shares)	328.3	310.8	325.2	310.6
AVERAGE NUMBER OF SHARES OUTSTANDING—DILUTED (shares)	329.2	311.9	326.1	311.7
Electric
OPERATING REVENUES
Total operating revenues	$ 1,971	$ 1,951	$ 3,912	$ 3,828
Gas
OPERATING REVENUES
Total operating revenues	449	489	1,484	1,428
OPERATING EXPENSES
Operating costs	131	194	573	572
Steam
OPERATING REVENUES
Total operating revenues	90	96	411	410
Non-utility
OPERATING REVENUES
Total operating revenues	234	160	451	394
Power
OPERATING EXPENSES
Operating costs	352	388	719	742
Fuel
OPERATING EXPENSES
Operating costs	26	38	133	162
Other operations and maintenance
OPERATING EXPENSES
Operating costs	781	756	1,575	1,592
CECONY
OPERATING REVENUES
Total operating revenues	2,331	2,338	5,371	5,222
OPERATING EXPENSES
Depreciation and amortization	339	316	673	626
Taxes, other than income taxes	550	512	1,125	1,051
TOTAL OPERATING EXPENSES	1,955	1,956	4,270	4,135
OPERATING INCOME	376	382	1,101	1,087
OTHER INCOME (DEDUCTIONS)
Investment income	4	4	13	8
Allowance for equity funds used during construction	3	3	6	6
Other deductions	(22)	(42)	(41)	(81)
TOTAL OTHER INCOME (DEDUCTIONS)	(15)	(35)	(22)	(67)
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	361	347	1,079	1,020
INTEREST EXPENSE
Interest on long-term debt	165	162	334	324
Other interest	19	7	36	12
Allowance for borrowed funds used during construction	(2)	(2)	(6)	(4)
NET INTEREST EXPENSE	182	167	364	332
INCOME BEFORE INCOME TAX EXPENSE	179	180	715	688
INCOME TAX EXPENSE	27	31	151	150
NET INCOME FOR COMMON STOCK	152	149	564	538
CECONY | Electric
OPERATING REVENUES
Total operating revenues	1,833	1,807	3,630	3,536
CECONY | Gas
OPERATING REVENUES
Total operating revenues	408	435	1,330	1,276
OPERATING EXPENSES
Operating costs	76	118	393	391
CECONY | Steam
OPERATING REVENUES
Total operating revenues	90	96	411	410
CECONY | Power
OPERATING EXPENSES
Operating costs	313	343	635	645
CECONY | Fuel
OPERATING EXPENSES
Operating costs	26	38	133	162
CECONY | Other operations and maintenance
OPERATING EXPENSES
Operating costs	$ 651	$ 629	$ 1,311	$ 1,260

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
NET INCOME	$ 179	$ 188	$ 624	$ 616
INCOME ATTRIBUTABLE TO NON-CONTROLLING INTEREST	(27)	0	(48)	0
NET INCOME	152	188	576	616
OTHER COMPREHENSIVE INCOME, NET OF TAXES
Pension and other postretirement benefit plan liability adjustments, net of taxes	1	2	5	6
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	2	5	6
COMPREHENSIVE INCOME	153	190	581	622
CECONY
NET INCOME	152	149	564	538
OTHER COMPREHENSIVE INCOME, NET OF TAXES
Pension and other postretirement benefit plan liability adjustments, net of taxes	0	1	0	1
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	0	1	0	1
COMPREHENSIVE INCOME	$ 152	$ 150	$ 564	$ 539

Consolidated Statement of Cash

Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Net income	$ 624	$ 616
Net income	576	616
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	831	702
Deferred income taxes	126	155
Rate case amortization and accruals	(59)	(56)
Common equity component of allowance for funds used during construction	(7)	(7)
Net derivative gains	31	2
Unbilled revenue and net unbilled revenue deferrals	(4)	113
Gain on sale of assets	(5)	0
Other non-cash items, net	(17)	(55)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable – customers	165	5
Materials and supplies, including fuel oil and gas in storage	14	16
Revenue decoupling mechanism	(127)	0
Other receivables and other current assets	125	(68)
Taxes receivable	19	49
Prepayments	(35)	(36)
Accounts payable	(156)	(61)
Pensions and retiree benefits obligations, net	168	171
Pensions and retiree benefits contributions	(78)	(368)
Accrued taxes	(15)	(63)
Accrued interest	25	(4)
Superfund and environmental remediation costs, net	(7)	(6)
Distributions from equity investments	27	54
System benefit charge	(1)	94
Deferred charges, noncurrent assets and other regulatory assets	(213)	(233)
Deferred credits and other regulatory liabilities	162	244
Other current and noncurrent liabilities	(55)	(224)
NET CASH FLOWS FROM OPERATING ACTIVITIES	1,538	1,040
INVESTING ACTIVITIES
Utility construction expenditures	(1,613)	(1,602)
Cost of removal less salvage	(142)	(121)
Non-utility construction expenditures	(92)	(109)
Investments in electric and gas transmission projects	(88)	(51)
Proceeds from sale of assets	48	0
Other investing activities	11	17
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,876)	(1,866)
FINANCING ACTIVITIES
Net issuance/(payment) of short-term debt	(1,405)	292
Issuance of long-term debt	1,989	1,640
Retirement of long-term debt	(657)	(619)
Debt issuance costs	(17)	(16)
Common stock dividends	(455)	(420)
Issuance of common shares - public offering	825	0
Issuance of common shares for stock plans	27	26
Distribution to noncontrolling interest	(5)	0
NET CASH FLOWS FROM FINANCING ACTIVITIES	302	903
CASH, TEMPORARY CASH INVESTMENTS, AND RESTRICTED CASH:
NET CHANGE FOR THE PERIOD	(36)	77
BALANCE AT BEGINNING OF PERIOD	1,006	844
BALANCE AT END OF PERIOD	970	921
Cash paid/(received) during the period for:
Interest	422	389
Income taxes	(15)	(2)
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	332	333
Issuance of common shares for dividend reinvestment	24	24
Software licenses acquired but unpaid as of end of period	80	94
CECONY
Net income	564	538
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	673	626
Deferred income taxes	90	149
Rate case amortization and accruals	(58)	(65)
Common equity component of allowance for funds used during construction	(6)	(6)
Unbilled revenue and net unbilled revenue deferrals	21	36
Gain on sale of assets	(5)	0
Other non-cash items, net	(10)	(13)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable – customers	143	14
Materials and supplies, including fuel oil and gas in storage	17	10
Revenue decoupling mechanism	(126)	0
Other receivables and other current assets	115	(74)
Accounts receivable from affiliated companies	83	(149)
Prepayments	(33)	(17)
Accounts payable	(140)	(71)
Accounts payable to affiliated companies	(2)	9
Pensions and retiree benefits obligations, net	157	157
Pensions and retiree benefits contributions	(77)	(367)
Accrued taxes	(18)	(66)
Accrued interest	(2)	(1)
Superfund and environmental remediation costs, net	(8)	(9)
System benefit charge	0	86
Accrued taxes to affiliated companies	0	(72)
Deferred charges, noncurrent assets and other regulatory assets	(216)	(164)
Deferred credits and other regulatory liabilities	146	229
Other current and noncurrent liabilities	(17)	(125)
NET CASH FLOWS FROM OPERATING ACTIVITIES	1,291	655
INVESTING ACTIVITIES
Utility construction expenditures	(1,501)	(1,509)
Cost of removal less salvage	(138)	(118)
Proceeds from sale of assets	48	0
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,591)	(1,627)
FINANCING ACTIVITIES
Net issuance/(payment) of short-term debt	(343)	400
Issuance of long-term debt	700	1,640
Retirement of long-term debt	(475)	(600)
Debt issuance costs	(8)	(16)
Capital contribution by parent	850	70
Dividend to parent	(456)	(423)
NET CASH FLOWS FROM FINANCING ACTIVITIES	268	1,071
CASH, TEMPORARY CASH INVESTMENTS, AND RESTRICTED CASH:
NET CHANGE FOR THE PERIOD	(32)	99
BALANCE AT BEGINNING OF PERIOD	818	730
BALANCE AT END OF PERIOD	786	829
Cash paid/(received) during the period for:
Interest	340	324
Income taxes	(20)	227
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	297	284
Software licenses acquired but unpaid as of end of period	$ 76	$ 89

Consolidated Balance Sheet (Una

Consolidated Balance Sheet (Unaudited) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
CURRENT ASSETS
Cash and temporary cash investments	$ 831	$ 895
Accounts receivable - customers, less allowance for uncollectible accounts	1,099	1,267
Other receivables, less allowance for uncollectible accounts	148	285
Taxes receivable	30	49
Accrued unbilled revenue	550	514
Fuel oil, gas in storage, materials and supplies, at average cost	344	358
Prepayments	222	187
Regulatory assets	97	76
Restricted cash	139	111
Revenue decoupling mechanism receivable	127	0
Other current assets	120	122
TOTAL CURRENT ASSETS	3,707	3,864
INVESTMENTS	1,899	1,766
UTILITY PLANT, AT ORIGINAL COST
General	3,428	3,331
TOTAL	46,867	45,371
Less: Accumulated depreciation	10,149	9,769
Net	36,718	35,602
Construction work in progress	1,898	1,978
NET UTILITY PLANT	38,616	37,580
NON-UTILITY PLANT
Non-utility property, less accumulated depreciation	3,961	4,000
Construction work in progress	168	169
NET PLANT	42,745	41,749
OTHER NONCURRENT ASSETS
Goodwill	440	440
Intangible assets, less accumulated amortization of $79 and $29 in 2019 and 2018, respectively	1,605	1,654
Regulatory assets	4,237	4,294
Operating lease right-of-use asset	842	0
Other deferred charges and noncurrent assets	127	153
TOTAL OTHER NONCURRENT ASSETS	7,251	6,541
TOTAL ASSETS	55,602	53,920
CURRENT LIABILITIES
Long-term debt due within one year	1,972	650
Term loan	0	825
Notes payable	1,161	1,741
Accounts payable	994	1,187
Customer deposits	350	351
Accrued taxes	47	61
Accrued interest	154	129
Accrued wages	111	109
Fair value of derivative liabilities	68	50
Regulatory liabilities	104	114
System benefit charge	626	627
Operating lease liabilities	55
Other current liabilities	327	363
TOTAL CURRENT LIABILITIES	5,969	6,207
NONCURRENT LIABILITIES
Provision for injuries and damages	144	146
Pensions and retiree benefits	1,120	1,228
Superfund and other environmental costs	770	779
Asset retirement obligations	427	450
Fair value of derivative liabilities	130	16
Deferred income taxes and unamortized investment tax credits	6,011	5,820
Operating lease liabilities	821
Regulatory liabilities	4,604	4,641
Other deferred credits and noncurrent liabilities	245	299
TOTAL NONCURRENT LIABILITIES	14,272	13,379
LONG-TERM DEBT	17,496	17,495
EQUITY
Common shareholders’ equity	17,709	16,726
Noncontrolling interest	156	113
TOTAL EQUITY (See Statement of Equity)	17,865	16,839
TOTAL LIABILITIES AND EQUITY	55,602	53,920
Electric
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	31,245	30,378
Gas
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	9,614	9,100
Steam
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	2,580	2,562
CECONY
CURRENT ASSETS
Cash and temporary cash investments	786	818
Accounts receivable - customers, less allowance for uncollectible accounts	1,016	1,163
Other receivables, less allowance for uncollectible accounts	89	211
Taxes receivable	5	5
Accrued unbilled revenue	403	392
Accounts receivable from affiliated companies	131	214
Fuel oil, gas in storage, materials and supplies, at average cost	287	304
Prepayments	150	117
Regulatory assets	82	64
Revenue decoupling mechanism receivable	127	0
Other current assets	67	69
TOTAL CURRENT ASSETS	3,143	3,357
INVESTMENTS	422	385
UTILITY PLANT, AT ORIGINAL COST
General	3,140	3,056
TOTAL	43,898	42,508
Less: Accumulated depreciation	9,333	8,988
Net	34,565	33,520
Construction work in progress	1,780	1,850
NET UTILITY PLANT	36,345	35,370
NON-UTILITY PLANT
Non-utility property, less accumulated depreciation	3	4
NET PLANT	36,348	35,374
OTHER NONCURRENT ASSETS
Regulatory assets	3,894	3,923
Operating lease right-of-use asset	617	0
Other deferred charges and noncurrent assets	51	69
TOTAL OTHER NONCURRENT ASSETS	4,562	3,992
TOTAL ASSETS	44,475	43,108
CURRENT LIABILITIES
Long-term debt due within one year	350	475
Notes payable	849	1,192
Accounts payable	835	977
Accounts payable to affiliated companies	15	17
Customer deposits	337	339
Accrued taxes	38	55
Accrued interest	110	112
Accrued wages	101	99
Fair value of derivative liabilities	41	25
Regulatory liabilities	61	73
System benefit charge	569	569
Operating lease liabilities	46
Other current liabilities	256	267
TOTAL CURRENT LIABILITIES	3,608	4,200
NONCURRENT LIABILITIES
Provision for injuries and damages	140	141
Pensions and retiree benefits	858	952
Superfund and other environmental costs	686	693
Asset retirement obligations	298	292
Fair value of derivative liabilities	86	6
Deferred income taxes and unamortized investment tax credits	5,893	5,739
Operating lease liabilities	595
Regulatory liabilities	4,214	4,258
Other deferred credits and noncurrent liabilities	206	241
TOTAL NONCURRENT LIABILITIES	12,976	12,322
LONG-TERM DEBT	14,023	13,676
EQUITY
Common shareholders’ equity	13,868	12,910
TOTAL LIABILITIES AND EQUITY	44,475	43,108
CECONY | Electric
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	29,416	28,595
CECONY | Gas
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	8,762	8,295
CECONY | Steam
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	$ 2,580	$ 2,562

Consolidated Balance Sheet (U_2

Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Accounts receivable - customers, allowance for uncollectible accounts	$ 65	$ 62
Other receivables, allowance for uncollectible accounts	4	5
Non-utility property, accumulated depreciation	329	275
Intangible assets, accumulated amortization	79	29
CECONY
Accounts receivable - customers, allowance for uncollectible accounts	60	57
Other receivables, allowance for uncollectible accounts	3	3
Non-utility property, accumulated depreciation	$ 25	$ 25

Consolidated Statement of Equit

Consolidated Statement of Equity/Shareholder's Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Capital Stock Expense	Accumulated Other Comprehensive Income/(Loss)	Non- controlling Interest	CECONY	CECONYCommon Stock	CECONYAdditional Paid-In Capital	CECONYRetained Earnings	CECONYRepurchased Con Edison Stock	CECONYCapital Stock Expense	CECONYAccumulated Other Comprehensive Income/(Loss)
Beginning Balance (shares) at Dec. 31, 2017		310			23
Beginning Balance (shares) at Dec. 31, 2017										235
Beginning Balance at Dec. 31, 2017	$ 15,425	$ 34	$ 6,298	$ 10,235	$ (1,038)	$ (85)	$ (26)	$ 7							$ (6)
Beginning Balance at Dec. 31, 2017									$ 12,439	$ 589	$ 4,649	$ 8,231	$ (962)	$ (62)	(6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	428			428
Net income									389			389
Common stock dividends	(221)			(221)					(211)			(211)
Issuance of common shares for stock plans (shares)		1
Issuance of common shares for stock plans	25		25
Capital contribution by parent									45		45
Other comprehensive income	4						4		0
Distributions to noncontrolling interest	0
Ending Balance (shares) at Mar. 31, 2018		311			23
Ending Balance (shares) at Mar. 31, 2018										235
Ending Balance at Mar. 31, 2018	15,661	$ 34	6,323	10,442	$ (1,038)	(85)	(22)	7							(6)
Ending Balance at Mar. 31, 2018									12,662	$ 589	4,694	8,409	(962)	(62)	(6)
Beginning Balance (shares) at Dec. 31, 2017		310			23
Beginning Balance (shares) at Dec. 31, 2017										235
Beginning Balance at Dec. 31, 2017	15,425	$ 34	6,298	10,235	$ (1,038)	(85)	(26)	7							(6)
Beginning Balance at Dec. 31, 2017									12,439	$ 589	4,649	8,231	(962)	(62)	(6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	616
Net income	0
Net income	616								538
Other comprehensive income	6								1
Ending Balance (shares) at Jun. 30, 2018		311			23
Ending Balance (shares) at Jun. 30, 2018										235
Ending Balance at Jun. 30, 2018	15,655	$ 34	6,350	10,407	$ (1,038)	(85)	(20)	7							(5)
Ending Balance at Jun. 30, 2018									12,625	$ 589	4,719	8,346	(962)	(62)	(5)
Beginning Balance (shares) at Mar. 31, 2018		311			23
Beginning Balance (shares) at Mar. 31, 2018										235
Beginning Balance at Mar. 31, 2018	15,661	$ 34	6,323	10,442	$ (1,038)	(85)	(22)	7							(6)
Beginning Balance at Mar. 31, 2018									12,662	$ 589	4,694	8,409	(962)	(62)	(6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	188			188
Net income	0
Net income	188								149			149
Common stock dividends	(223)			(223)					(212)			(212)
Issuance of common shares for stock plans (shares)
Issuance of common shares for stock plans	27		27
Capital contribution by parent									25		25
Other comprehensive income	2						2		1						1
Distributions to noncontrolling interest	0
Ending Balance (shares) at Jun. 30, 2018		311			23
Ending Balance (shares) at Jun. 30, 2018										235
Ending Balance at Jun. 30, 2018	15,655	$ 34	6,350	10,407	$ (1,038)	(85)	(20)	7							(5)
Ending Balance at Jun. 30, 2018									12,625	$ 589	4,719	8,346	(962)	(62)	(5)
Beginning Balance (shares) at Dec. 31, 2018		321			23
Beginning Balance (shares) at Dec. 31, 2018										235
Beginning Balance at Dec. 31, 2018	16,839	$ 34	7,117	10,728	$ (1,038)	(99)	(16)	113							(5)
Beginning Balance at Dec. 31, 2018	16,726								12,910	$ 589	4,769	8,581	(962)	(62)	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	445			424
Net income								21
Net income									412			412
Common stock dividends	(237)			(237)					(228)			(228)
Issuance of common shares – public offering (shares)		6
Issuance of common shares – public offering	425		433			(8)
Issuance of common shares for stock plans	27		27
Capital contribution by parent									225		225
Other comprehensive income	4						4		0
Distributions to noncontrolling interest	(2)							(2)
Ending Balance (shares) at Mar. 31, 2019		327			23
Ending Balance (shares) at Mar. 31, 2019										235
Ending Balance at Mar. 31, 2019	17,501	$ 34	7,577	10,915	$ (1,038)	(107)	(12)	132							(5)
Ending Balance at Mar. 31, 2019									13,319	$ 589	4,994	8,765	(962)	(62)	(5)
Beginning Balance (shares) at Dec. 31, 2018		321			23
Beginning Balance (shares) at Dec. 31, 2018										235
Beginning Balance at Dec. 31, 2018	16,839	$ 34	7,117	10,728	$ (1,038)	(99)	(16)	113							(5)
Beginning Balance at Dec. 31, 2018	16,726								12,910	$ 589	4,769	8,581	(962)	(62)	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	624
Net income	48
Net income	576								564
Other comprehensive income	5								0
Ending Balance (shares) at Jun. 30, 2019		332			23
Ending Balance (shares) at Jun. 30, 2019										235
Ending Balance at Jun. 30, 2019	17,865	$ 35	8,008	10,825	$ (1,038)	(110)	(11)	156							(5)
Ending Balance at Jun. 30, 2019	17,709								13,868	$ 589	5,619	8,689	(962)	(62)	(5)
Beginning Balance (shares) at Mar. 31, 2019		327			23
Beginning Balance (shares) at Mar. 31, 2019										235
Beginning Balance at Mar. 31, 2019	17,501	$ 34	7,577	10,915	$ (1,038)	(107)	(12)	132							(5)
Beginning Balance at Mar. 31, 2019									13,319	$ 589	4,994	8,765	(962)	(62)	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	179			152
Net income	27							27
Net income	152								152			152
Common stock dividends	(242)			(242)					(228)			(228)
Issuance of common shares – public offering (shares)		5
Issuance of common shares – public offering	400	$ 1	402			(3)
Issuance of common shares for stock plans	29		29
Capital contribution by parent									625		625
Other comprehensive income	1						1		0
Distributions to noncontrolling interest	(3)							(3)
Ending Balance (shares) at Jun. 30, 2019		332			23
Ending Balance (shares) at Jun. 30, 2019										235
Ending Balance at Jun. 30, 2019	17,865	$ 35	$ 8,008	$ 10,825	$ (1,038)	$ (110)	$ (11)	$ 156							(5)
Ending Balance at Jun. 30, 2019	$ 17,709								$ 13,868	$ 589	$ 5,619	$ 8,689	$ (962)	$ (62)	$ (5)

Consolidated Statement of Equ_2

Consolidated Statement of Equity/Shareholder's Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Common stock dividends per share (dollars per share)	$ 0.74	$ 0.74	$ 0.715	$ 0.715

General

General	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
General	General These combined notes accompany and form an integral part of the separate consolidated financial statements of each of the two separate registrants: Consolidated Edison, Inc. and its subsidiaries (Con Edison) and Consolidated Edison Company of New York, Inc. and its subsidiaries (CECONY). CECONY is a subsidiary of Con Edison and as such its financial condition and results of operations and cash flows, which are presented separately in the CECONY consolidated financial statements, are also consolidated, along with those of Orange and Rockland Utilities, Inc. (O&R), Con Edison Clean Energy Businesses, Inc. (together with its subsidiaries, the Clean Energy Businesses) and Con Edison Transmission, Inc. (together with its subsidiaries, Con Edison Transmission) in Con Edison’s consolidated financial statements. The term “Utilities” is used in these notes to refer to CECONY and O&R. As used in these notes, the term “Companies” refers to Con Edison and CECONY and, except as otherwise noted, the information in these combined notes relates to each of the Companies. However, CECONY makes no representation as to information relating to Con Edison or the subsidiaries of Con Edison other than itself. The separate interim consolidated financial statements of each of the Companies are unaudited but, in the opinion of their respective managements, reflect all adjustments (which include only normally recurring adjustments) necessary for a fair presentation of the results for the interim periods presented. The Companies’ separate interim consolidated financial statements should be read together with their separate audited financial statements (including the combined notes thereto) included in Item 8 of their combined Annual Report on Form 10-K for the year ended December 31, 2018 and their separate unaudited financial statements (including the combined notes thereto) included in Part 1, Item 1 of their combined Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2019. Certain prior period amounts have been reclassified to conform to the current period presentation. Con Edison has two regulated utility subsidiaries: CECONY and O&R. CECONY provides electric service and gas service in New York City and Westchester County. The company also provides steam service in parts of Manhattan. O&R, along with its regulated utility subsidiary, provides electric service in southeastern New York and northern New Jersey and gas service in southeastern New York. Con Edison Clean Energy Businesses, Inc. has three subsidiaries: Consolidated Edison Development, Inc. (Con Edison Development), a company that develops, owns and operates renewable and energy infrastructure projects; Consolidated Edison Energy, Inc. (Con Edison Energy), a company that provides energy-related products and services to wholesale customers; and Consolidated Edison Solutions, Inc. (Con Edison Solutions), a company that provides energy-related products and services to retail customers. Con Edison Transmission, Inc. invests in electric transmission facilities through its subsidiary, Consolidated Edison Transmission, LLC (CET Electric), and invests in gas pipeline and storage facilities through its subsidiary Con Edison Gas Pipeline and Storage, LLC (CET Gas).

Summary of Significant Accounti

Summary of Significant Accounting Policies and Other Matters	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies and Other Matters	Summary of Significant Accounting Policies and Other Matters Revenue Recognition The following table presents, for the three and six months ended June 30, 2019 and 2018 , revenue from contracts with customers as defined in Accounting Standards Codification (ASC) Topic 606, "Revenue from Contracts with Customers," as well as additional revenue from sources other than contracts with customers, disaggregated by major source. For the Three Months Ended June 30, 2019 For the Three Months Ended June 30, 2018 (Millions of Dollars) Revenues from contracts with customers Other revenues (a) Total operating revenues Revenues from contracts with customers Other revenues (a) Total operating revenues CECONY Electric $1,751 $82 $1,833 $1,771 $36 $1,807 Gas 400 8 408 428 7 435 Steam 86 4 90 93 3 96 Total CECONY $2,237 $94 $2,331 $2,292 $46 $2,338 O&R Electric 140 (2) 138 146 (2) 144 Gas 39 2 41 47 7 54 Total O&R $179 $— $179 $193 $5 $198 Clean Energy Businesses Renewables 171 (b) — 171 73 (b) — 73 Energy services 16 — 16 23 — 23 Other — 46 46 — 62 62 Total Clean Energy Businesses $187 $46 $233 $96 $62 $158 Con Edison Transmission 1 — 1 1 — 1 Other (c) — — — — 1 1 Total Con Edison $2,604 $140 $2,744 $2,582 $114 $2,696 (a) For the Utilities, this includes revenue from alternative revenue programs, such as the revenue decoupling mechanisms under their New York electric and gas rate plans. For the Clean Energy Businesses, this includes revenue from wholesale services. (b) Included within the totals for Renewables revenue at the Clean Energy Businesses is $4 million and $9 million for the three months ended June 30, 2019 and 2018 , respectively, of revenue related to engineering, procurement and construction services. (c) P arent company and consolidation adjustments. For the Six Months Ended June 30, 2019 For the Six Months Ended June 30, 2018 Revenues from contracts with customers Other revenues (a) Total operating revenues Revenues from contracts with customers Other revenues (a) Total operating revenues CECONY Electric $3,465 $165 $3,630 $3,474 $62 $3,536 Gas 1,310 20 1,330 1,252 24 1,276 Steam 402 9 411 404 6 410 Total CECONY $5,177 $194 $5,371 $5,130 $92 $5,222 O&R Electric 283 — 283 293 — 293 Gas 153 1 154 148 4 152 Total O&R $436 $1 $437 $441 $4 $445 Clean Energy Businesses Renewables 278 (b) — 278 205 (b) — 205 Energy services 39 — 39 41 — 41 Other — 133 133 — 145 145 Total Clean Energy Businesses $317 $133 $450 $246 $145 $391 Con Edison Transmission 2 — 2 2 — 2 Other (c) — (2) (2) — — — Total Con Edison $5,932 $326 $6,258 $5,819 $241 $6,060 (a) For the Utilities, this includes revenue from alternative revenue programs, such as the revenue decoupling mechanisms under their New York electric and gas rate plans. For the Clean Energy Businesses, this includes revenue from wholesale services. (b) Included within the totals for Renewables revenue at the Clean Energy Businesses is $6 million and $97 million for the six months ended June 30, 2019 and 2018 , respectively, of revenue related to engineering, procurement and construction services. (c) P arent company and consolidation adjustments. 2019 2018 (Millions of Dollars) Unbilled contract revenue (a) Unearned revenue (b) Unbilled contract revenue (a) Unearned revenue (b) Beginning balance as of January 1, $29 $20 $58 $87 Additions (c) 44 — 73 31 Subtractions (c) 38 2 (d) 88 105 (d) Ending balance as of June 30, $35 $18 $43 $13 (a) Unbilled contract revenue represents accumulated incurred costs and earned profits on contracts (revenue arrangements), which have been recorded as revenue, but have not yet been billed to customers, and which represent contract assets as defined in Topic 606. Substantially all accrued unbilled contract revenue is expected to be collected within one year. Unbilled contract revenue arises from the cost-to-cost method of revenue recognition. Unbilled contract revenue from fixed-price type contracts is converted to billed receivables when amounts are invoiced to customers according to contractual billing terms, which generally occur when deliveries or other performance milestones are completed. (b) Unearned revenue represents a liability for billings to customers in excess of earned revenue, which are contract liabilities as defined in Topic 606. (c) Additions for unbilled contract revenue and subtractions for unearned revenue represent additional revenue earned. Additions for unearned revenue and subtractions for unbilled contract revenue represent billings. Activity also includes appropriate balance sheet classification for the period. (d) Of the subtractions from unearned revenue, $2 million and $50 million were included in the balance as of January 1, 2019 and 2018, respectively. As of June 30, 2019 , the aggregate amount of the remaining fixed performance obligations of the Clean Energy Businesses under contracts with customers for energy services is $67 million , of which $31 million will be recognized within the next two years, and the remaining $36 million will be recognized pursuant to long-term service and maintenance agreements. Utility Plant General utility plant of Con Edison and CECONY included $97 million and $ 92 million , respectively, at June 30, 2019 and $100 million and $95 million , respectively, at December 31, 2018 , related to a May 2018 acquisition of software licenses. The estimated aggregate annual amortization expense related to the software licenses for Con Edison and CECONY is $7 million . The accumulated amortization for Con Edison and CECONY was $7 million and $6 million , respectively, at June 30, 2019 and was $3 million at December 31, 2018 . Long-Lived and Intangible Assets In January 2019, Pacific Gas and Electric Company (PG&E) filed for reorganization under Chapter 11 of the U.S. Bankruptcy Code. The output of Con Edison Development renewable electric production projects with an aggregate of 680 MW (AC) of generating capacity (PG&E Projects) is sold to PG&E under long-term power purchase agreements (PG&E PPAs). Most of the PG&E PPAs have contract prices that are higher than estimated market prices. PG&E, as a debtor in possession, may assume or reject the PG&E PPAs, subject to review by the bankruptcy court or, pursuant to a January 2019 FERC order (which PG&E is challenging), the bankruptcy court and FERC. In a May 2019 order, FERC denied PG&E’s request for a rehearing of the January 2019 order and reaffirmed its jurisdiction to review and approve the modification or abrogation of wholesale power contracts that are the subject of rejection in bankruptcy. In June 2019, the bankruptcy court ruled that FERC does not have concurrent jurisdiction with it and that FERC’s January and May 2019 orders are of no force and effect in the bankruptcy proceeding. FERC and additional parties, including Con Edison Development, are challenging the bankruptcy court’s June 2019 ruling. In July 2019, California enacted a law addressing future California wildfires. The law includes provisions for the establishment of wildfire liquidity and insurance funds and possible limitation of future wildfire liabilities for California utilities. PG&E, Southern California Edison Company and San Diego Gas & Electric Company have agreed to participate in the insurance fund. PG&E’s participation will require bankruptcy court approval and is conditioned on, among other things, resolution of PG&E’s bankruptcy by June 30, 2020 and a determination by the California Public Utilities Commission that PG&E’s bankruptcy reorganization plan is consistent with the state’s climate goals as required under the California Renewables Portfolio Standard Program and related procurement requirements of the state. The PG&E bankruptcy is an event of default under the PG&E PPAs. Unless the lenders for the related project debt otherwise agree, distributions from the related projects to Con Edison Development will not be made during the pendency of the bankruptcy. At June 30, 2019 , Con Edison’s consolidated balance sheet included $853 million of net non-utility plant relating to the PG&E Projects, $1,090 million of intangible assets relating to the PG&E PPAs, $288 million of net non-utility plant of additional projects that secure the related project debt and $1,032 million of non-recourse related project debt. See Note C. Con Edison has tested whether its net non-utility plant relating to the PG&E Projects and intangible assets relating to the PG&E PPAs have been impaired. The projected future cash flows used in the test reflected Con Edison’s expectation that the PG&E PPAs are not likely to be rejected. Based on the test, Con Edison has determined that there was no impairment. If, in the future, one or more of the PG&E PPAs is rejected or any such rejection becomes likely, there will be an impairment of the related intangible assets and could be an impairment of the related non-utility plant. The amount of any such impairment could be material. Earnings Per Common Share Con Edison presents basic and diluted earnings per share (EPS) on the face of its consolidated income statement. Basic EPS is calculated by dividing earnings available to common shareholders (“Net income for common stock” on Con Edison’s consolidated income statement) by the weighted average number of Con Edison common shares outstanding during the period. In the calculation of diluted EPS, weighted average shares outstanding are increased for additional shares that would be outstanding if potentially dilutive securities were converted to common stock. Potentially dilutive securities for Con Edison consist of restricted stock units and deferred stock units for which the average market price of the common shares for the period was greater than the exercise price and its common shares that are subject to a May 2019 forward sale agreement (see Note C). Before the issuance of common shares upon settlement of the forward sale agreement, the shares will be reflected in the company’s diluted earnings per share calculations using the treasury stock method. Under this method, the number of common shares used in calculating diluted earnings per share is deemed to be increased by the excess, if any, of the number of shares that would be issued upon physical settlement of the forward sale agreement over the number of shares that could be purchased by the company in the market (based on the average market price during the period) using the proceeds due upon physical settlement (based on the adjusted forward sale price at the end of the reporting period). For the three and six months ended June 30, 2019 and 2018 , basic and diluted EPS for Con Edison are calculated as follows: For the Three Months Ended June 30, For the Six Months Ended June 30, (Millions of Dollars, except per share amounts/Shares in Millions) 2019 2018 2019 2018 Net income for common stock $152 $188 $576 $616 Weighted average common shares outstanding – basic 328.3 310.8 325.2 310.6 Add: Incremental shares attributable to effect of potentially dilutive securities 0.9 1.1 0.9 1.1 Adjusted weighted average common shares outstanding – diluted 329.2 311.9 326.1 311.7 Net Income per common share – basic $0.46 $0.60 $1.77 $1.98 Net Income per common share – diluted $0.46 $0.60 $1.77 $1.98 The computation of diluted EPS for the three and six months ended June 30, 2019 and 2018 excludes immaterial amounts of performance share awards that were not included because of their anti-dilutive effect. Changes in Accumulated Other Comprehensive Income/(Loss) by Component For the three and six months ended June 30, 2019 and 2018 , changes to accumulated other comprehensive income/(loss) (OCI) for Con Edison and CECONY are as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Beginning balance, accumulated OCI, net of taxes (a) $(12) $(22) $(5) $(6) Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2018 (a)(b) 1 2 — 1 Current period OCI, net of taxes 1 2 — 1 Ending balance, accumulated OCI, net of taxes $(11) $(20) $(5) $(5) For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Beginning balance, accumulated OCI, net of taxes (a) $(16) $(26) $(5) $(6) OCI before reclassifications, net of tax of $(1) for Con Edison in 2019 and 2018 2 3 — — Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2019 and 2018 (a)(b) 3 3 — 1 Current period OCI, net of taxes 5 6 — 1 Ending balance, accumulated OCI, net of taxes $(11) $(20) $(5) $(5) (a) Tax reclassified from accumulated OCI is reported in the income tax expense line item of the consolidated income statement. (b) For the portion of unrecognized pension and other postretirement benefit costs relating to the Utilities, costs are recorded into, and amortized out of, regulatory assets instead of OCI. The net actuarial losses and prior service costs recognized during the period are included in the computation of total periodic pension and other postretirement benefit cost. See Notes E and F. Reconciliation of Cash, Temporary Cash Investments and Restricted Cash Cash, temporary cash investments and restricted cash are presented on a combined basis in the Companies’ consolidated statements of cash flows. At June 30, 2019 and 2018 , cash, temporary cash investments and restricted cash for Con Edison and CECONY are as follows: At June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Cash and temporary cash investments $831 $866 $786 $829 Restricted cash (a) 139 55 — — Total cash, temporary cash investments and restricted cash $970 $921 $786 $829 (a) Restricted cash included cash of Con Edison Development renewable electric production project subsidiaries ( $138 million and $54 million at June 30, 2019 and 2018 , respectively) that, under the related project debt agreements, is restricted until the various maturity dates of the project debt to being used for normal operating expenses and capital expenditures, debt service, and required reserves. During the pendency of the PG&E bankruptcy, unless the lenders for the related project debt otherwise agree, cash may not be distributed from the related projects to Con Edison Development. See “Long-Lived and Intangible Assets,” above, and Note C. In addition, restricted cash included O&R's New Jersey utility subsidiary, Rockland Electric Company transition bond charge collections, net of principal, interest, trustee and service fees ( $1 million at June 30, 2019 and 2018 ) .

Regulatory Matters

Regulatory Matters	6 Months Ended
	Jun. 30, 2019
Regulated Operations [Abstract]
Regulatory Matters	Regulatory Matters Rate Plans CECONY – Electric In May 2019, the New York State Public Service Commission (NYSPSC) staff submitted testimony in the NYSPSC proceeding in which CECONY requested an electric rate increase, effective January 2020. The NYSPSC staff testimony supports an electric rate increase of $58 million reflecting, among other things, an 8.3 percent return on common equity and a common equity ratio of 47.3 percent . In June 2019, CECONY filed an update to the request it filed in January 2019. The company decreased its requested January 2020 rate increase by $15 million to $470 million , increased its illustrated January 2021 rate increase by $27 million to $379 million and increased its illustrated January 2022 rate increase by $7 million to $270 million . This updated filing reflects a 9.75 percent return on common equity and a common equity ratio of 50 percent . CECONY – Gas In May 2019, the NYSPSC staff submitted testimony in the NYSPSC proceeding in which CECONY requested a gas rate increase, effective January 2020. The NYSPSC staff testimony supports a gas rate increase of $83 million reflecting, among other things, an 8.3 percent return on common equity and a common equity ratio of 47.3 percent . In June 2019, CECONY filed an update to the request it filed in January 2019. The company decreased its requested January 2020 rate increase by $4 million to $206 million , decreased its illustrated January 2021 rate increase by $4 million to $134 million and increased its illustrated January 2022 rate increase by $5 million to $160 million . This updated filing reflects a 9.75 percent return on common equity and a common equity ratio of 50 percent . O&R New York – Electric and Gas In March 2019, the NYSPSC approved the November 2018 joint proposal for new electric and gas rates. The joint proposal provides for electric rate increases of $13.4 million , $8.0 million and $5.8 million , effective January 1, 2019, 2020 and 2021, respectively. The joint proposal provides for a gas rate decrease of $7.5 million , effective January 1, 2019, and gas rate increases of $3.6 million and $0.7 million , effective January 1, 2020 and 2021. Rockland Electric Company (RECO) In May 2019, RECO filed a request with the New Jersey Board of Public Utilities for an electric rate increase of $19.9 million , effective February 2020. The filing reflected a return on common equity of 10.00 percent and a common equity ratio of 49.93 percent . In July 2019, RECO filed an update to the request it filed in May 2019. The company increased its requested February 2020 rate increase to $20.4 million and reduced the common equity ratio to 49.04 percent . The updated filing continues to reflect a return on common equity of 10.00 percent . Other Regulatory Matters In August and November 2017, the NYSPSC issued orders in its proceeding investigating an April 21, 2017 Metropolitan Transportation Authority (MTA) subway power outage. The orders indicated that the investigation determined that the outage was caused by a failure of CECONY’s electricity supply to a subway station, which led to a loss of the subway signals, and that one of the secondary services to the MTA facility had been improperly rerouted and was not properly documented by the company. The orders also indicated that the loss of power to the subway station affected multiple subway lines and caused widespread delays across the subway system. Pursuant to the orders, the company was required to take certain actions, including inspecting, repairing and installing certain electrical equipment that serves the subway system, analyzing power supply and power quality events affecting the MTA’s signaling services, and filing monthly reports with the NYSPSC on all of the company's activities related to the subway system. The company completed the required actions in 2018. Through June 30, 2019 , the company incurred costs related to this matter of $273 million . Included in this amount is $32 million in capital and operating and maintenance costs reflected in the company's electric rate plan and $241 million deferred as a regulatory asset that the company is seeking to recover in its pending electric rate proceeding. The company is unable to estimate the amount or range of its possible loss related to this matter. At June 30, 2019 , the company had not accrued a liability related to this matter. In August 2018, the NYSPSC ordered CECONY to begin on January 1, 2019 to credit the company's electric and gas customers, and to begin on October 1, 2018 to credit its steam customers, with the net benefits of the federal Tax Cuts and Jobs Act of 2017 (TCJA) as measured based on amounts reflected in its rate plans prior to the enactment of the TCJA in December 2017. The net benefits include the revenue requirement impact of the reduction in the corporate federal income tax rate to 21 percent, the elimination for utilities of bonus depreciation and the amortization of excess deferred federal income taxes. CECONY estimates that its credit of net benefits of the TCJA to its electric, gas and steam customers in 2019 will amount to $259 million , $113 million and $25 million , respectively. CECONY’s net benefits prior to January 1, 2019 allocable to the company’s electric customers ( $311 million ) are to be deferred and addressed in its pending electric rate proceeding. CECONY’s net benefits prior to January 1, 2019 allocable to the company’s gas customers ( $90 million ) and net benefits prior to October 1, 2018 allocable to the company’s steam customers ( $15 million ) are to be amortized over a three -year period. CECONY’s net regulatory liability for future income taxes, including both the protected and unprotected portions, allocable to the company’s electric customers ( $2,489 million ) is to continue to be deferred and addressed in its pending electric rate proceeding and the amounts allocable to its gas and steam customers ( $804 million and $185 million , respectively) are to be amortized over the remaining lives of the related assets (with the amortization period for the unprotected portion subject to review in its pending gas rate proceeding and next steam rate proceeding). In January 2018, the NYSPSC issued an order initiating a focused operations audit of the income tax accounting of certain utilities, including CECONY and O&R. The Utilities are unable to estimate the amount or range of their possible loss related to this matter. At June 30, 2019 , the Utilities had not accrued a liability related to this matter. In March 2018, Winter Storms Riley and Quinn caused damage to the Utilities’ electric distribution systems and interrupted service to approximately 209,000 CECONY customers, 93,000 O&R customers and 44,000 RECO customers. At June 30, 2019 , CECONY's costs related to March 2018 storms, including Riley and Quinn, amounted to $134 million , including operation and maintenance expenses reflected in its electric rate plan ( $15 million ), operation and maintenance expenses charged against a storm reserve pursuant to its electric rate plan ( $84 million ), capital expenditures ( $29 million ) and removal costs ( $6 million ). At June 30, 2019 , O&R and RECO costs related to 2018 storms amounted to $43 million and $17 million , respectively, most of which were deferred as regulatory assets pursuant to their electric rate plans. In January 2019, O&R began recovering its deferred storm costs over a six year period in accordance with its New York electric rate plan. The NYSPSC investigated the preparation and response to the storms by CECONY, O&R, and other New York electric utilities, including all aspects of their emergency response plans. In April 2019, following the issuance of a NYSPSC staff report on the investigation, the NYSPSC ordered the utilities to show cause why the NYSPSC should not commence a penalty action against them for violating their emergency response plans. The Utilities are unable to estimate the amount or range of their possible loss related to this matter. At June 30, 2019 , the Utilities had not accrued a liability related to this matter. In May 2018, FERC denied a complaint the NJBPU filed with FERC seeking the re-allocation to CECONY of certain PJM Interconnection LLC (PJM) transmission costs that had been allocated to the company prior to April 2017 when transmission service provided to the company pursuant to the PJM open access transmission tariff terminated. The transmission service terminated because the company did not exercise its option to continue the service following a series of requests PJM had submitted to FERC that substantially increased the charges for the transmission service. CECONY challenged each of these requests. FERC rejected all but one of CECONY’s protests. In June 2015 and May 2016, CECONY filed appeals of certain FERC decisions with the U.S. Court of Appeals. In July 2018, FERC established a settlement proceeding relating to the allocation of PJM transmission costs. Under CECONY’s electric rate plan, unless and until changed by the NYSPSC, the company will recover all charges incurred associated with the transmission service. In July 2018, the NYSPSC commenced an investigation into the rupture of a CECONY steam main (see Note H). In March 2019, the NYSPSC ordered CECONY to show cause why the NYSPSC should not commence a penalty action and prudence proceeding against CECONY for alleged violations of gas operator qualification, performance, and inspection requirements. The company is seeking to resolve this matter through settlement negotiations with the NYSPSC staff. Any settlement would be subject to NYSPSC approval. The company is unable to estimate the amount or range of its possible loss related to this matter. At June 30, 2019 , the company had not accrued a liability related to this matter. On July 13, 2019, electric service was interrupted to approximately 72,000 CECONY customers on the west side of Manhattan. The NYSPSC and the Northeast Power Coordinating Council, a regional reliability entity, are investigating the July 13, 2019 power outage. The NYSPSC is also investigating other CECONY power outages that occurred in July 2019. Pursuant to the reliability performance provisions of its electric rate plan, as a result of the July 13, 2019 power outage, the company is subject to a $5 million negative revenue adjustment (which it expects to recognize in the third quarter of 2019). The company is unable to estimate the amount or range of its possible additional loss related to the power outages. At June 30, 2019 , the company had not accrued a liability related to the power outages. Regulatory Assets and Liabilities Regulatory assets and liabilities at June 30, 2019 and December 31, 2018 were comprised of the following items: Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Regulatory assets Unrecognized pension and other postretirement costs $2,042 $2,238 $1,934 $2,111 Environmental remediation costs 787 810 696 716 Revenue taxes 304 291 291 278 MTA power reliability deferral 241 229 241 229 Property tax reconciliation 127 101 115 86 Deferred derivative losses 117 17 106 11 Municipal infrastructure support costs 76 67 76 67 Pension and other postretirement benefits deferrals 73 73 54 56 Deferred storm costs 72 76 — — System peak reduction and energy efficiency programs 48 72 47 70 Meadowlands heater odorization project 35 36 35 36 Brooklyn Queens demand management program 34 39 34 39 Unamortized loss on reacquired debt 32 36 30 34 Preferred stock redemption 23 23 23 23 Recoverable REV demonstration project costs 20 20 18 18 Gate station upgrade project 17 17 17 17 Workers’ compensation 4 5 4 5 O&R transition bond charges 1 2 — — Indian Point Energy Center program costs — 13 — 13 Other 184 129 173 114 Regulatory assets – noncurrent 4,237 4,294 3,894 3,923 Deferred derivative losses 75 36 63 29 Recoverable energy costs 22 40 19 35 Regulatory assets – current 97 76 82 64 Total Regulatory Assets $4,334 $4,370 $3,976 $3,987 Regulatory liabilities Future income tax $2,470 $2,515 $2,323 $2,363 Allowance for cost of removal less salvage 947 928 805 790 TCJA net benefits* 449 434 429 411 Net unbilled revenue deferrals 155 117 155 117 Energy efficiency portfolio standard unencumbered funds 124 127 119 122 Pension and other postretirement benefit deferrals 63 62 39 40 Net proceeds from sale of property 45 6 45 6 Property tax refunds 45 45 45 45 System benefit charge carrying charge 37 27 33 24 Earnings sharing - electric, gas and steam 25 36 17 27 Settlement of prudence proceeding 22 37 22 37 BQDM and REV Demo reconciliations 22 18 22 18 Settlement of gas proceedings 12 15 12 15 Carrying charges on repair allowance and bonus depreciation 10 21 9 21 New York State income tax rate change 8 17 8 17 Unrecognized other postretirement costs 8 7 3 7 Base rate change deferrals 4 10 4 10 Property tax reconciliation 2 36 2 36 Other 156 183 122 152 Regulatory liabilities – noncurrent 4,604 4,641 4,214 4,258 Refundable energy costs 50 31 22 8 Revenue decoupling mechanism 36 53 22 36 Deferred derivative gains 18 30 17 29 Regulatory liabilities – current 104 114 61 73 Total Regulatory Liabilities $4,708 $4,755 $4,275 $4,331 * See "Other Regulatory Matters," above.

Capitalization

Capitalization	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Capitalization	Capitalization In February 2019, Con Edison borrowed $825 million under a two -year variable-rate term loan to fund the repayment of a 6-month variable-rate term loan. In June 2019, Con Edison pre-paid $150 million of the amount borrowed. In March 2019, Con Edison issued 5,649,369 shares of its common stock for $425 million upon physical settlement of the remaining shares subject to its November 2018 forward sale agreements. In May 2019, Con Edison entered into a forward sale agreement relating to 5,800,000 shares of its common stock. In June 2019, the company issued 4,750,000 shares for $400 million upon physical settlement of shares subject to the forward sale agreement. At June 30, 2019, 1,050,000 shares remain subject to the forward sale agreement. The company expects the remaining shares under the forward sale agreement to settle by December 28, 2020. The company or the forward purchaser may accelerate the forward sale agreement upon the occurrence of certain events. On a settlement date, if the company decides to physically settle, it will issue shares to the forward purchaser at the then-applicable forward sale price. The forward sale price is equal to $84.83 per share subject to adjustment on a daily basis based on a floating interest rate factor less a spread and will be subject to decrease by amounts related to expected dividends. The remaining shares under the forward sale agreement will be physically settled, unless the company elects cash or net share settlement (which it has the right to do, subject to certain conditions, other than in limited circumstances). In the event the company elects to cash settle or net share settle, the settlement amount will be generally related to (1)(a) the market value of the common stock during the unwind period under the forward sale agreement minus (b) the applicable forward sale price; multiplied by (2) the number of shares subject to such cash settlement or net share settlement. If this settlement amount is a negative number, the forward purchaser will pay the company the absolute value of that amount or deliver to the company a number of shares having a value equal to the absolute value of such amount. If this settlement amount is a positive number, the company will pay the forward purchaser that amount or deliver to the forward purchaser a number of shares having a value equal to such amount. In May 2019, CECONY issued $700 million aggregate principal amount of 4.125 percent debentures, due 2049. In April 2019, CECONY redeemed at maturity $475 million of 6.65 percent 10 -year debentures. In May 2019, O&R’s New Jersey utility subsidiary paid the remaining $1 million principal amount of Transition Bonds issued in 2004. In May 2019, a Con Edison Development subsidiary borrowed $464 million , due 2026, secured by equity interests in solar electric production projects. The carrying amounts and fair values of long-term debt at June 30, 2019 and December 31, 2018 were: (Millions of Dollars) 2019 2018 Long-Term Debt (including current portion) (a) Carrying Amount Fair Value Carrying Amount Fair Value Con Edison $19,468 $21,626 $18,145 $18,740 CECONY $14,373 $16,330 $14,151 $14,685 (a) Amounts shown are net of unamortized debt expense and unamortized debt discount of $192 million and $142 million for Con Edison and CECONY, respectively, as of June 30, 2019 and $185 million and $139 million for Con Edison and CECONY, respectively, as of December 31, 2018 . The fair values of the Companies' long-term debt have been estimated primarily using available market information and at June 30, 2019 are classified as Level 2 (see Note M). At December 31, 2018, the Clean Energy Businesses had $2,076 million of non-recourse project debt secured by the pledge of the applicable renewable energy production projects, of which $1,965 million was included in long-term debt and $111 million was included in long-term debt due within one year in Con Edison's consolidated balance sheet. As a result of the January 2019 PG&E bankruptcy (see "Long-Lived and Intangible Assets" in Note A), during the first quarter of 2019, Con Edison reclassified on its consolidated balance sheet the PG&E-related project debt that was included in long-term debt to long-term debt due within one year. At June 30, 2019 , long-term debt due within one year included $1,032 million of PG&E-related project debt. The lenders for the PG&E-related project debt may, upon written notice, declare principal and interest on the PG&E-related project debt to be due and payable immediately and, if such amounts are not timely paid, foreclose on the related projects. The company is seeking to

Short-Term Borrowing

Short-Term Borrowing	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Short-Term Borrowing	Short-Term Borrowing At June 30, 2019 , Con Edison had $1,161 million of commercial paper outstanding of which $849 million was outstanding under CECONY’s program. The weighted average interest rate at June 30, 2019 was 2.6 percent for both Con Edison and CECONY. At December 31, 2018 , Con Edison had $1,741 million of commercial paper outstanding of which $1,192 million was outstanding under CECONY’s program. The weighted average interest rate at December 31, 2018 was 3.0 percent for both Con Edison and CECONY. At June 30, 2019 and December 31, 2018 , no loans were outstanding under the Companies' December 2016 credit agreement (Credit Agreement). An immaterial amount of letters of credit were outstanding under the Credit Agreement as of June 30, 2019 and December 31, 2018 . In April 2019, the termination date of the Credit Agreement was extended from December 2022 to December 2023 with respect to banks with aggregate commitments of $2,200 million .

Pension Benefits

Pension Benefits	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Pension Benefits	Pension Benefits Total Periodic Benefit Cost The components of the Companies’ total periodic benefit cost for the three and six months ended June 30, 2019 and 2018 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Service cost – including administrative expenses $62 $72 $58 $68 Interest cost on projected benefit obligation 150 140 141 131 Expected return on plan assets (247) (258) (234) (245) Recognition of net actuarial loss 130 172 123 163 Recognition of prior service cost/(credit) (4) (4) (5) (5) TOTAL PERIODIC BENEFIT COST $91 $122 $83 $112 Cost capitalized (29) (31) (27) (29) Reconciliation to rate level (2) (23) (1) (25) Total expense recognized $60 $68 $55 $58 For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Service cost – including administrative expenses $125 $145 $117 $136 Interest cost on projected benefit obligation 301 280 282 263 Expected return on plan assets (494) (516) (468) (490) Recognition of net actuarial loss 259 344 246 326 Recognition of prior service cost/(credit) (9) (9) (10) (10) TOTAL PERIODIC BENEFIT COST $182 $244 $167 $225 Cost capitalized (55) (62) (52) (59) Reconciliation to rate level (7) (46) (6) (50) Total expense recognized $120 $136 $109 $116 Components of net periodic benefit cost other than service cost are presented outside of operating income on the Companies' consolidated income statements, and only the service cost component is eligible for capitalization. Accordingly, the service cost component is included in the line "Other operations and maintenance" and the non-service cost components are included in the line "Other deductions" in the Companies' consolidated income statements. Expected Contributions Based on estimates as of June 30, 2019 , the Companies expect to make contributions to the pension plans during 2019 of $350 million (of which $318 million is to be made by CECONY). The Companies’ policy is to fund the total periodic benefit cost of the qualified plan to the extent tax deductible and to also contribute to the non-qualified supplemental plans. During the first six months of 2019, the Companies contributed $78 million to the pension plans, of which $77 million was made by CECONY. CECONY also contributed $15 million to the external trust for its non-qualified supplemental plan.

Other Postretirement Benefits

Other Postretirement Benefits	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Other Postretirement Benefits	Other Postretirement Benefits Total Periodic Benefit Cost The components of the Companies’ total periodic other postretirement benefit cost/(credit) for the three and six months ended June 30, 2019 and 2018 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Service cost $4 $5 $3 $3 Interest cost on accumulated other postretirement benefit obligation 11 11 9 9 Expected return on plan assets (16) (18) (14) (16) Recognition of net actuarial loss/(gain) (2) 2 (2) 1 Recognition of prior service cost/(credit) (1) (2) — (1) TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT) $(4) $(2) $(4) $(4) Cost capitalized (2) (2) (2) (1) Reconciliation to rate level 3 2 2 2 Total expense/(credit) recognized $(3) $(2) $(4) $(3) For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Service cost $9 $10 $6 $7 Interest cost on accumulated other postretirement benefit obligation 22 21 18 17 Expected return on plan assets (33) (37) (27) (31) Recognition of net actuarial loss/(gain) (4) 4 (5) 1 Recognition of prior service cost/(credit) (2) (3) (1) (1) TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT) $(8) $(5) $(9) $(7) Cost capitalized (4) (4) (3) (3) Reconciliation to rate level 7 5 4 5 Total expense/(credit) recognized $(5) $(4) $(8) $(5) For information about the presentation of the components of other postretirement benefit costs, see Note E. Contributions Based on estimates as of June 30, 2019 , Con Edison and CECONY expect to make contributions of $10 million (of which $7 million is to be made by CECONY) to the other postretirement benefit plans in 2019. The Companies' policy is to fund the total periodic benefit cost of the plans to the extent tax deductible.

Environmental Matters

Environmental Matters	6 Months Ended
	Jun. 30, 2019
Environmental Remediation Obligations [Abstract]
Environmental Matters	Environmental Matters Superfund Sites Hazardous substances, such as asbestos, polychlorinated biphenyls (PCBs) and coal tar, have been used or generated in the course of operations of the Utilities and their predecessors and are present at sites and in facilities and equipment they currently or previously owned, including sites at which gas was manufactured or stored. The Federal Comprehensive Environmental Response, Compensation and Liability Act of 1980 and similar state statutes (Superfund) impose joint and several liability, regardless of fault, upon generators of hazardous substances for investigation and remediation costs (which include costs of demolition, removal, disposal, storage, replacement, containment and monitoring) and natural resource damages. Liability under these laws can be material and may be imposed for contamination from past acts, even though such past acts may have been lawful at the time they occurred. The sites at which the Utilities have been asserted to have liability under these laws, including their manufactured gas plant sites and any neighboring areas to which contamination may have migrated, are referred to herein as “Superfund Sites.” For Superfund Sites where there are other potentially responsible parties and the Utilities are not managing the site investigation and remediation, the accrued liability represents an estimate of the amount the Utilities will need to pay to investigate and, where determinable, discharge their related obligations. For Superfund Sites (including the manufactured gas plant sites) for which one of the Utilities is managing the investigation and remediation, the accrued liability represents an estimate of the company’s share of the undiscounted cost to investigate the sites and, for sites that have been investigated in whole or in part, the cost to remediate the sites, if remediation is necessary and if a reasonable estimate of such cost can be made. Remediation costs are estimated in light of the information available, applicable remediation standards and experience with similar sites. The accrued liabilities and regulatory assets related to Superfund Sites at June 30, 2019 and December 31, 2018 were as follows: Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Accrued Liabilities: Manufactured gas plant sites $681 $689 $598 $603 Other Superfund Sites 89 90 88 90 Total $770 $779 $686 $693 Regulatory assets $787 $810 $696 $716 Most of the accrued Superfund Site liability relates to sites that have been investigated, in whole or in part. However, for some of the sites, the extent and associated cost of the required remediation has not yet been determined. As investigations progress and information pertaining to the required remediation becomes available, the Utilities expect that additional liability may be accrued, the amount of which is not presently determinable but may be material. The Utilities are permitted to recover or defer as regulatory assets (for subsequent recovery through rates) prudently incurred site investigation and remediation costs. Environmental remediation costs incurred related to Superfund Sites for the three and six months ended June 30, 2019 and 2018 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Remediation costs incurred $8 $6 $6 $5 For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Remediation costs incurred $11 $9 $8 $8 Insurance and other third-party recoveries received by Con Edison or CECONY were immaterial for the three and six months ended June 30, 2019 and 2018 . In 2018, Con Edison and CECONY estimated that for their manufactured gas plant sites (including CECONY’s Astoria site), the aggregate undiscounted potential liability for the investigation and remediation of coal tar and/or other environmental contaminants could range up to $2.8 billion and $2.6 billion, respectively. These estimates were based on the assumption that there is contamination at all sites, including those that have not yet been fully investigated and additional assumptions about the extent of the contamination and the type and extent of the remediation that may be required. Actual experience may be materially different. Asbestos Proceedings Suits have been brought in New York State and federal courts against the Utilities and many other defendants, wherein a large number of plaintiffs sought large amounts of compensatory and punitive damages for deaths and injuries allegedly caused by exposure to asbestos at various premises of the Utilities. The suits that have been resolved, which are many, have been resolved without any payment by the Utilities, or for amounts that were not, in the aggregate, material to them. The amounts specified in all the remaining thousands of suits total billions of dollars; however, the Utilities believe that these amounts are greatly exaggerated, based on the disposition of previous claims. At June 30, 2019 , Con Edison and CECONY have accrued their estimated aggregate undiscounted potential liabilities for these suits and additional suits that may be brought over the next 15 years as shown in the following table. These estimates were based upon a combination of modeling, historical data analysis and risk factor assessment. Courts have begun, and unless otherwise determined on appeal may continue, to apply different standards for determining liability in asbestos suits than the standard that applied historically. As a result, the Companies currently believe that there is a reasonable possibility of an exposure to loss in excess of the liability accrued for the suits. The Companies are unable to estimate the amount or range of such loss. In addition, certain current and former employees have claimed or are claiming workers’ compensation benefits based on alleged disability from exposure to asbestos. CECONY is permitted to defer as regulatory assets (for subsequent recovery through rates) costs incurred for its asbestos lawsuits and workers’ compensation claims. The accrued liability for asbestos suits and workers’ compensation proceedings (including those related to asbestos exposure) and the amounts deferred as regulatory assets for the Companies at June 30, 2019 and December 31, 2018 were as follows: Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Accrued liability – asbestos suits $8 $8 $7 $7 Regulatory assets – asbestos suits $8 $8 $7 $7 Accrued liability – workers’ compensation $79 $79 $75 $75 Regulatory assets – workers’ compensation $4 $5 $4 $5

Other Material Contingencies

Other Material Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Other Material Contingencies	10 years Total (Millions of Dollars) Con Edison Transmission $535 $137 $— $672 Energy transactions 494 21 197 712 Renewable electric production projects 128 9 376 513 Other 70 — — 70 Total $1,227 $167 $573 $1,967 Con Edison Transmission — Con Edison has guaranteed payment by CET Electric of the contributions CET Electric agreed to make to New York Transco LLC (NY Transco). CET Electric owns a 45.7 percent interest in NY Transco. In April 2019, the New York Independent System Operator (NYISO) selected a transmission project that was jointly proposed by National Grid and NY Transco. The siting, construction and operation of the project will require approvals and permits from appropriate governmental agencies and authorities, including the NYSPSC. The NYISO indicated it will work with the developers to enter into agreements for the development and operation of the projects, including a schedule for entry into service by December 2023. Guarantee amount shown includes the maximum possible required amount of CET Electric’s contributions for this project as calculated based on the assumptions that the project is completed at 175 percent of its estimated costs and NY Transco does not use any debt financing for the project. Also included within the table above are guarantees for $124 million from Con Edison on behalf of CET Gas in relation to Mountain Valley Pipeline (MVP), LLC, a company developing a proposed gas transmission project in West Virginia and Virginia. Energy Transactions — Con Edison guarantees payments on behalf of the Clean Energy Businesses in order to facilitate physical and financial transactions in electricity, gas, pipeline capacity, transportation, oil, renewable energy credits and energy services. To the extent that liabilities exist under the contracts subject to these guarantees, such liabilities are included in Con Edison’s consolidated balance sheet. Renewable Electric Production Projects — Con Edison, Con Edison Development, and Con Edison Solutions guarantee payments on behalf of their wholly-owned subsidiaries associated with their investment in, or development for others of, solar and wind energy facilities. Other — Other guarantees include $70 million" id="sjs-B4">Other Material Contingencies Manhattan Explosion and Fire On March 12, 2014, two multi-use five-story tall buildings located on Park Avenue between 116 th and 117 th Streets in Manhattan were destroyed by an explosion and fire. CECONY had delivered gas to the buildings through service lines from a distribution main located below ground on Park Avenue. Eight people died and more than 50 people were injured. Additional buildings were also damaged. The National Transportation Safety Board (NTSB) investigated. The parties to the investigation included the company, the City of New York, the Pipeline and Hazardous Materials Safety Administration and the NYSPSC. In June 2015, the NTSB issued a final report concerning the incident, its probable cause and safety recommendations. The NTSB determined that the probable cause of the incident was (1) the failure of a defective fusion joint at a service tee (which joined a plastic service line to a plastic distribution main) installed by the company that allowed gas to leak from the distribution main and migrate into a building where it ignited and (2) a breach in a City sewer line that allowed groundwater and soil to flow into the sewer, resulting in a loss of support for the distribution main, which caused it to sag and overstressed the defective fusion joint. The NTSB also made safety recommendations, including recommendations to the company that addressed its procedures for the preparation and examination of plastic fusions, training of its staff on conditions for notifications to the City’s Fire Department and extension of its gas main isolation valve installation program. In February 2017, the NYSPSC approved a settlement agreement with the company related to the NYSPSC's investigations of the incident and the practices of qualifying persons to perform plastic fusions. Pursuant to the agreement, the company is providing $27 million of future benefits to customers (for which it has accrued a regulatory liability) and will not recover from customers $126 million of costs for gas emergency response activities that it had previously incurred and expensed. Approximately eighty suits are pending against the company seeking generally unspecified damages and, in some cases, punitive damages, for wrongful death, personal injury, property damage and business interruption. The company has notified its insurers of the incident and believes that the policies in force at the time of the incident will cover the company’s costs, in excess of a required retention (the amount of which is not material), to satisfy any liability it may have for damages in connection with the incident. The company is unable to estimate the amount or range of its possible loss for damages related to the incident. At June 30, 2019 , the company had not accrued a liability for damages related to the incident. Manhattan Steam Main Rupture In July 2018, a CECONY steam main located on Fifth Avenue and 21 st Street in Manhattan ruptured. Debris from the incident included dirt and mud containing asbestos. The response to the incident required the closing of buildings and streets for various periods. The NYSPSC has commenced an investigation. As of June 30, 2019 , with respect to the incident, the company incurred estimated operating costs of $16 million for property damage, clean- up and other response costs and invested $10 million in capital and retirement costs. The company has notified its insurers of the incident and believes that the policies currently in force will cover the company’s costs, in excess of a required retention (the amount of which is not material), to satisfy any liability it may have for damages to others in connection with the incident. The company is unable to estimate the amount or range of its possible loss related to the incident. At June 30, 2019 , the company had not accrued a liability related to the incident. Other Contingencies For information about the PG&E bankruptcy, see "Long-Lived and Intangible Assets" in Note A and Note C. Also, for additional contingencies, see "Other Regulatory Matters" in Note B and “Uncertain Tax Positions” in Note J. Guarantees Con Edison and its subsidiaries have entered into various agreements providing financial or performance assurance primarily to third parties on behalf of their subsidiaries. Maximum amounts guaranteed by Con Edison under these agreements totaled $1,967 million and $2,439 million at June 30, 2019 and December 31, 2018 , respectively. A summary, by type and term, of Con Edison’s total guarantees under these agreements at June 30, 2019 is as follows: Guarantee Type 0 – 3 years 4 – 10 years > 10 years Total (Millions of Dollars) Con Edison Transmission $535 $137 $— $672 Energy transactions 494 21 197 712 Renewable electric production projects 128 9 376 513 Other 70 — — 70 Total $1,227 $167 $573 $1,967 Con Edison Transmission — Con Edison has guaranteed payment by CET Electric of the contributions CET Electric agreed to make to New York Transco LLC (NY Transco). CET Electric owns a 45.7 percent interest in NY Transco. In April 2019, the New York Independent System Operator (NYISO) selected a transmission project that was jointly proposed by National Grid and NY Transco. The siting, construction and operation of the project will require approvals and permits from appropriate governmental agencies and authorities, including the NYSPSC. The NYISO indicated it will work with the developers to enter into agreements for the development and operation of the projects, including a schedule for entry into service by December 2023. Guarantee amount shown includes the maximum possible required amount of CET Electric’s contributions for this project as calculated based on the assumptions that the project is completed at 175 percent of its estimated costs and NY Transco does not use any debt financing for the project. Also included within the table above are guarantees for $124 million from Con Edison on behalf of CET Gas in relation to Mountain Valley Pipeline (MVP), LLC, a company developing a proposed gas transmission project in West Virginia and Virginia. Energy Transactions — Con Edison guarantees payments on behalf of the Clean Energy Businesses in order to facilitate physical and financial transactions in electricity, gas, pipeline capacity, transportation, oil, renewable energy credits and energy services. To the extent that liabilities exist under the contracts subject to these guarantees, such liabilities are included in Con Edison’s consolidated balance sheet. Renewable Electric Production Projects — Con Edison, Con Edison Development, and Con Edison Solutions guarantee payments on behalf of their wholly-owned subsidiaries associated with their investment in, or development for others of, solar and wind energy facilities. Other — Other guarantees include $70 million

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	Leases In January 2019, the Companies adopted Accounting Standards Update (ASU) No. 2016-02, “Leases (Topic 842),” including the amendments thereto, using a modified retrospective transition method of adoption that required no prior period adjustments or charges to retained earnings for cumulative impact. The standard supersedes the lease requirements within ASC Topic 840, “Leases.” The Companies lease land, office buildings, equipment and access rights to support electric transmission facilities. Upon adoption of Topic 842, the Companies recognized lease right-of-use assets and lease liabilities on their consolidated balance sheets for virtually all of their leases (other than leases that meet the definition of a short-term lease, the expense for which was immaterial). A lease right-of-use asset represents a right to use an identifiable underlying asset and obtain substantially all of the economic benefits from the use of that asset for the lease term. A lease liability represents an obligation to make lease payments arising from the lease. Leases are classified as either operating leases or finance leases. Operating leases are included in operating lease right-of-use asset and operating lease liabilities on the Companies’ consolidated balance sheets. Finance leases are included in other noncurrent assets, other current liabilities and other noncurrent liabilities. The Utilities, as regulated entities, are permitted to continue to recognize expense for operating leases using the timing that conforms to the regulatory rate treatment as rental payments recovered from our customers and to account the same way for finance leases. Lessor accounting is similar to the previous model, but updated to align with ASC Topic 606 “Revenue from Contracts with Customers." The Companies elected the following practical expedients: (1) a package of practical expedients that allows the Companies to not reassess: (a) whether expired or existing contracts contained leases; (b) the lease classification for expired or existing leases and (c) the initial direct costs for existing leases; (2) for all underlying asset classes, an expedient that allows the Companies to not apply the recognition requirements to short-term leases and an expedient that allows the Companies to account for lease and associated non-lease components as a single lease component; (3) an expedient that allows the use of hindsight to determine lease term; and (4) an expedient that allows the Companies to not evaluate under Topic 842 land easements that exist or expired before the entity’s adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. The Companies, upon adoption of Topic 842 recognized, and for new operating leases at commencement date recognize, operating lease right-of-use assets and operating lease liabilities based on the present value of the future minimum lease payments over the lease term. As most of the Companies’ leases do not provide an implicit rate, the Companies used their collateralized incremental borrowing rate based on the information available at the commencement date to determine the present value of future payments. Most of the Companies’ leases have remaining lease terms of one year to 35 years , and may include options to renew or extend the leases for up to five years at the fair rental value. The Companies' lease terms may include options to renew, extend or terminate the lease when it is reasonably certain that the Companies will exercise that option. There were no leases with material variable lease payments or residual value guarantees. Operating lease cost and cash paid for amounts included in the measurement of lease liabilities for the three and six months ended June 30, 2019 were as follows: For the Three Months Ended June 30, 2019 (Millions of Dollars) Con Edison CECONY Operating lease cost $21 $16 Operating lease cash flows $9 $4 For the Six Months Ended June 30, 2019 (Millions of Dollars) Con Edison CECONY Operating lease cost $41 $32 Operating lease cash flows $17 $8 As of June 30, 2019 , assets recorded as finance leases for Con Edison and CECONY were $2 million and $1 million , respectively, and the accumulated amortization associated with finance leases for Con Edison and CECONY were $5 million and $3 million , respectively. For the three and six months ended June 30, 2019 , finance lease costs and cash flows for Con Edison and CECONY were immaterial. Right-of-use assets obtained in exchange for lease obligations were immaterial for Con Edison and CECONY for the three and six months ended June 30, 2019 . Other information related to leases for Con Edison and CECONY at June 30, 2019 was as follows: Con Edison CECONY Weighted Average Remaining Lease Term: Operating leases 19.1 years 14.5 years Finance leases 10.5 years 2.3 years Weighted Average Discount Rate: Operating leases 4.3% 3.6% Finance leases 4.0% 5.1% Future minimum lease payments under non-cancellable leases at June 30, 2019 were as follows: (Millions of Dollars) Con Edison CECONY Year Ending June 30, Operating Leases Finance Leases Operating Leases Finance Leases 2020 $77 $1 $58 $1 2021 74 — 57 — 2022 70 — 54 — 2023 68 — 53 — 2024 68 — 53 — All years thereafter 970 1 551 — Total future minimum lease payments $1,327 $2 $826 $1 Less: imputed interest (451) — (185) — Total $876 $2 $641 $1 Reported as of June 30, 2019 Operating lease liabilities (current) $55 $— $46 $— Operating lease liabilities (noncurrent) 821 — 595 — Other current liabilities — 1 — 1 Other noncurrent liabilities — 1 — — Total $876 $2 $641 $1 At June 30, 2019 , the Companies do not have material obligations under operating or finance leases that have not yet commenced. Disclosures related to the three and six months ended June 30, 2019 are presented as required under Topic 842. Prior period disclosures for the year ended December 31, 2018 are presented under Topic 840. The Companies have elected to use a practical expedient provided by Topic 842 whereby comparative disclosures for prior periods are allowed to be presented under Topic 840. Prior period disclosures under Topic 840 have been provided on an annual basis. As a result, the disclosures presented under Topic 842 and Topic 840 will not be fully comparable in specific disclosure requirements or time period. The future minimum lease commitments at December 31, 2018, accounted for under Topic 840, for the Companies’ operating lease agreements that are not cancellable by the Companies were as follows: (Millions of Dollars) Con Edison CECONY 2019 $72 $56 2020 72 56 2021 71 54 2022 68 53 2023 68 53 All years thereafter 890 592 Total $1,241 $864 The Companies are lessors under certain leases whereby the Companies own real estate and distribution poles and lease portions of them to others. Revenue under such leases was immaterial for Con Edison and CECONY for the three and six months ended June 30, 2019
Leases	Leases In January 2019, the Companies adopted Accounting Standards Update (ASU) No. 2016-02, “Leases (Topic 842),” including the amendments thereto, using a modified retrospective transition method of adoption that required no prior period adjustments or charges to retained earnings for cumulative impact. The standard supersedes the lease requirements within ASC Topic 840, “Leases.” The Companies lease land, office buildings, equipment and access rights to support electric transmission facilities. Upon adoption of Topic 842, the Companies recognized lease right-of-use assets and lease liabilities on their consolidated balance sheets for virtually all of their leases (other than leases that meet the definition of a short-term lease, the expense for which was immaterial). A lease right-of-use asset represents a right to use an identifiable underlying asset and obtain substantially all of the economic benefits from the use of that asset for the lease term. A lease liability represents an obligation to make lease payments arising from the lease. Leases are classified as either operating leases or finance leases. Operating leases are included in operating lease right-of-use asset and operating lease liabilities on the Companies’ consolidated balance sheets. Finance leases are included in other noncurrent assets, other current liabilities and other noncurrent liabilities. The Utilities, as regulated entities, are permitted to continue to recognize expense for operating leases using the timing that conforms to the regulatory rate treatment as rental payments recovered from our customers and to account the same way for finance leases. Lessor accounting is similar to the previous model, but updated to align with ASC Topic 606 “Revenue from Contracts with Customers." The Companies elected the following practical expedients: (1) a package of practical expedients that allows the Companies to not reassess: (a) whether expired or existing contracts contained leases; (b) the lease classification for expired or existing leases and (c) the initial direct costs for existing leases; (2) for all underlying asset classes, an expedient that allows the Companies to not apply the recognition requirements to short-term leases and an expedient that allows the Companies to account for lease and associated non-lease components as a single lease component; (3) an expedient that allows the use of hindsight to determine lease term; and (4) an expedient that allows the Companies to not evaluate under Topic 842 land easements that exist or expired before the entity’s adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. The Companies, upon adoption of Topic 842 recognized, and for new operating leases at commencement date recognize, operating lease right-of-use assets and operating lease liabilities based on the present value of the future minimum lease payments over the lease term. As most of the Companies’ leases do not provide an implicit rate, the Companies used their collateralized incremental borrowing rate based on the information available at the commencement date to determine the present value of future payments. Most of the Companies’ leases have remaining lease terms of one year to 35 years , and may include options to renew or extend the leases for up to five years at the fair rental value. The Companies' lease terms may include options to renew, extend or terminate the lease when it is reasonably certain that the Companies will exercise that option. There were no leases with material variable lease payments or residual value guarantees. Operating lease cost and cash paid for amounts included in the measurement of lease liabilities for the three and six months ended June 30, 2019 were as follows: For the Three Months Ended June 30, 2019 (Millions of Dollars) Con Edison CECONY Operating lease cost $21 $16 Operating lease cash flows $9 $4 For the Six Months Ended June 30, 2019 (Millions of Dollars) Con Edison CECONY Operating lease cost $41 $32 Operating lease cash flows $17 $8 As of June 30, 2019 , assets recorded as finance leases for Con Edison and CECONY were $2 million and $1 million , respectively, and the accumulated amortization associated with finance leases for Con Edison and CECONY were $5 million and $3 million , respectively. For the three and six months ended June 30, 2019 , finance lease costs and cash flows for Con Edison and CECONY were immaterial. Right-of-use assets obtained in exchange for lease obligations were immaterial for Con Edison and CECONY for the three and six months ended June 30, 2019 . Other information related to leases for Con Edison and CECONY at June 30, 2019 was as follows: Con Edison CECONY Weighted Average Remaining Lease Term: Operating leases 19.1 years 14.5 years Finance leases 10.5 years 2.3 years Weighted Average Discount Rate: Operating leases 4.3% 3.6% Finance leases 4.0% 5.1% Future minimum lease payments under non-cancellable leases at June 30, 2019 were as follows: (Millions of Dollars) Con Edison CECONY Year Ending June 30, Operating Leases Finance Leases Operating Leases Finance Leases 2020 $77 $1 $58 $1 2021 74 — 57 — 2022 70 — 54 — 2023 68 — 53 — 2024 68 — 53 — All years thereafter 970 1 551 — Total future minimum lease payments $1,327 $2 $826 $1 Less: imputed interest (451) — (185) — Total $876 $2 $641 $1 Reported as of June 30, 2019 Operating lease liabilities (current) $55 $— $46 $— Operating lease liabilities (noncurrent) 821 — 595 — Other current liabilities — 1 — 1 Other noncurrent liabilities — 1 — — Total $876 $2 $641 $1 At June 30, 2019 , the Companies do not have material obligations under operating or finance leases that have not yet commenced. Disclosures related to the three and six months ended June 30, 2019 are presented as required under Topic 842. Prior period disclosures for the year ended December 31, 2018 are presented under Topic 840. The Companies have elected to use a practical expedient provided by Topic 842 whereby comparative disclosures for prior periods are allowed to be presented under Topic 840. Prior period disclosures under Topic 840 have been provided on an annual basis. As a result, the disclosures presented under Topic 842 and Topic 840 will not be fully comparable in specific disclosure requirements or time period. The future minimum lease commitments at December 31, 2018, accounted for under Topic 840, for the Companies’ operating lease agreements that are not cancellable by the Companies were as follows: (Millions of Dollars) Con Edison CECONY 2019 $72 $56 2020 72 56 2021 71 54 2022 68 53 2023 68 53 All years thereafter 890 592 Total $1,241 $864 The Companies are lessors under certain leases whereby the Companies own real estate and distribution poles and lease portions of them to others. Revenue under such leases was immaterial for Con Edison and CECONY for the three and six months ended June 30, 2019

Income Tax

Income Tax	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Tax	Income Tax Con Edison’s income tax expense decreased to $19 million for the three months ended June 30, 2019 from $38 million for the three months ended June 30, 2018 . The decrease in income tax expense is primarily due to lower income before income tax expense (excluding income attributable to noncontrolling interest (see Note N)), lower state income taxes, an increase in the amortization of excess deferred federal income taxes due to the TCJA and higher renewable energy credits, offset in part by an increase in uncertain tax positions. CECONY’s income tax expense decreased to $27 million for the three months ended June 30, 2019 from $31 million for the three months ended June 30, 2018 . The decrease in income tax expense is primarily due to lower state income taxes, higher tax benefits in 2019 for plant-related flow through items, and an increase in the amortization of excess deferred federal income taxes due to the TCJA . Reconciliation of the difference between income tax expense and the amount computed by applying the prevailing statutory income tax rate to income before income taxes for the three months ended June 30, 2019 and 2018 is as follows: Con Edison CECONY (% of Pre-tax income) 2019 2018 2019 2018 STATUTORY TAX RATE Federal 21 % 21 % 21 % 21 % Changes in computed taxes resulting from: State income tax 3 5 3 4 Cost of removal 2 2 2 2 Other plant-related items (2 ) (1 ) (1 ) (1 ) Renewable energy credits (5 ) (3 ) — — Reserve for uncertain tax positions 2 — — — Amortization of excess deferred federal income taxes (10 ) (7 ) (9 ) (8 ) Other — — (1 ) (1 ) Effective tax rate 11 % 17 % 15 % 17 % Con Edison’s income tax expense decreased to $127 million for the six months ended June 30, 2019 from $156 million for the six months ended June 30, 2018 . The decrease in income tax expense is primarily due to lower income before income tax expense (excluding income attributable to noncontrolling interest (see Note N)), lower state income taxes, an increase in the amortization of excess deferred federal income taxes due to the TCJA and higher renewable energy credits. CECONY’s income tax expense increased to $151 million for the six months ended June 30, 2019 from $150 million for the six months ended June 30, 2018 . The increase in income tax expense is primarily due to higher income before income tax expense, offset in part by higher tax benefits in 2019 for plant-related flow through items, an increase in the amortization of excess deferred federal income taxes due to the TCJA, a decrease in non-deductible business expenses and an increase in research and development credits . Reconciliation of the difference between income tax expense and the amount computed by applying the prevailing statutory income tax rate to income before income taxes for the six months ended June 30, 2019 and 2018 is as follows: Con Edison CECONY (% of Pre-tax income) 2019 2018 2019 2018 STATUTORY TAX RATE Federal 21 % 21 % 21 % 21 % Changes in computed taxes resulting from: State income tax 4 5 4 5 Cost of removal 1 1 1 1 Other plant-related items (1 ) (1 ) (1 ) (1 ) Renewable energy credits (2 ) (2 ) — — Amortization of excess deferred federal income taxes (5 ) (4 ) (4 ) (4 ) Effective tax rate 18 % 20 % 21 % 22 % CECONY and O&R deferred as regulatory liabilities their estimated net benefits under the TCJA for the six months ended June 30, 2018 . CECONY's net benefits prior to January 1, 2019 for its electric service and amortization of excess deferred federal income taxes for its electric service for the six months ended June 30, 2019 continue to be deferred. RECO deferred as a regulatory liability its estimated net benefits under the TCJA for the three months ended March 31, 2018. The net benefits include the revenue requirement impact of the reduction in the corporate federal income tax rate to 21 percent, the elimination for utilities of bonus depreciation and the amortization of excess deferred federal income taxes the utilities collected from customers that will not need to be paid to the Internal Revenue Service under the TCJA. See “Other Regulatory Matters” in Note B. Uncertain Tax Positions At June 30, 2019 , the estimated liability for uncertain tax positions for Con Edison was $8 million ( $5 million for CECONY). Con Edison reasonably expects to resolve within the next twelve months approximately $3 million of various federal and state uncertainties due to the expected completion of ongoing tax examinations, of which the entire amount, if recognized, would reduce Con Edison's effective tax rate. The amount related to CECONY is approximately $2 million , which, if recognized, would reduce CECONY’s effective tax rate. The total amount of unrecognized tax benefits, if recognized, that would reduce Con Edison’s effective tax rate is $8 million ( $7 million , net of federal taxes). The Companies recognize interest on liabilities for uncertain tax positions in interest expense and would recognize penalties, if any, in operating expenses in the Companies’ consolidated income statements. In the three and six months ended June 30, 2019 , the Companies recognized an immaterial amount of interest expense or penalties for uncertain tax positions in their consolidated income statements. At June 30, 2019 and December 31, 2018 , the Companies recognized an immaterial amount of accrued interest on their consolidated balance sheets.

Financial Information by Busine

Financial Information by Business Segment	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Financial Information by Business Segment	Financial Information by Business Segment Con Edison’s principal business segments are CECONY’s regulated utility activities, O&R’s regulated utility activities, the Clean Energy Businesses and Con Edison Transmission. CECONY’s principal business segments are its regulated electric, gas and steam utility activities. The financial data for the business segments for the three and six months ended June 30, 2019 and 2018 were as follows: For the Three Months Ended June 30, Operating Inter-segment Depreciation and Operating (Millions of Dollars) 2019 2018 2019 2018 2019 2018 2019 2018 CECONY Electric $1,833 $1,807 $5 $4 $261 $243 $314 $318 Gas 408 435 2 2 56 51 94 82 Steam 90 96 16 18 22 22 (32) (18) Consolidation adjustments — — (23) (24) — — — — Total CECONY $2,331 $2,338 $— $— $339 $316 $376 $382 O&R Electric $138 $144 $— $— $15 $14 $16 $18 Gas 41 54 — — 6 5 (3) 5 Total O&R $179 $198 $— $— $21 $19 $13 $23 Clean Energy Businesses $233 $158 $— $— $58 $19 $72 $24 Con Edison Transmission 1 1 — — — — (2) (1) Other (a) — 1 — — — — (1) (2) Total Con Edison $2,744 $2,696 $— $— $418 $354 $458 $426 (a) Parent company and consolidation adjustments. Other does not represent a business segment. For the Six Months Ended June 30, Operating Inter-segment Depreciation and Operating (Millions of Dollars) 2019 2018 2019 2018 2019 2018 2019 2018 CECONY Electric $3,630 $3,536 $9 $8 $518 $483 $571 $571 Gas 1,330 1,276 3 4 111 100 438 404 Steam 411 410 35 37 44 43 92 112 Consolidation adjustments — — (47) (49) — — — — Total CECONY $5,371 $5,222 $— $— $673 $626 $1,101 $1,087 O&R Electric $283 $293 $— $— $30 $28 $31 $26 Gas 154 152 — — 12 10 36 42 Total O&R $437 $445 $— $— $42 $38 $67 $68 Clean Energy Businesses 450 391 — — 116 38 83 33 Con Edison Transmission 2 2 — — — — (3) (3) Other (a) (2 ) — — — — — (4) (5) Total Con Edison $6,258 $6,060 $— $— $831 $702 $1,244 $1,180 (a) Parent company and consolidation adjustments. Other does not represent a business segment.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities The Utilities and the Clean Energy Businesses hedge market price fluctuations associated with physical purchases and sales of electricity, natural gas, steam and, to a lesser extent, refined fuels by using derivative instruments including futures, forwards, basis swaps, options, transmission congestion contracts and financial transmission rights contracts. The Clean Energy Businesses use interest rate swaps to manage the risks associated with interest rates related to outstanding and expected future debt issuances and borrowings. Derivatives are recognized on the consolidated balance sheet at fair value (see Note M), unless an exception is available under the accounting rules for derivatives and hedging. Qualifying derivative contracts that have been designated as normal purchases or normal sales contracts are not reported at fair value under the accounting rules. In August 2017, the FASB issued amendments to the guidance for derivatives and hedging through ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.” The amendments in this update provide greater clarification on hedge accounting for risk components, presentation and disclosure of hedging instruments, and overall targeted improvements to simplify hedge accounting. The amendments were effective for reporting periods beginning after December 15, 2018. The application of the guidance did not have a material impact on the Companies’ financial position, results of operations and liquidity because the Companies do not elect hedge accounting for their derivative instruments and hedging activities. The fair values of the Companies’ derivatives including the offsetting of assets and liabilities on the consolidated balance sheet at June 30, 2019 and December 31, 2018 were: (Millions of Dollars) 2019 2018 Balance Sheet Location Gross Amounts of Recognized Assets/(Liabilities) Gross Amounts Offset Net Amounts of Assets/ (Liabilities) (a) Gross Amounts of Recognized Assets/(Liabilities) Gross Amounts Offset Net Amounts of Assets/ (Liabilities) (a) Con Edison Fair value of derivative assets Current $37 $(24) $13 (b) $43 $(14) $29 (b) Noncurrent 6 (6) — 16 (7) 9 (d) Total fair value of derivative assets $43 $(30) $13 $59 $(21) $38 Fair value of derivative liabilities Current $(97) $29 $(68) (c) $(61) $11 $(50) Noncurrent (152) 22 (130) (c) (25) 9 (16) (d) Total fair value of derivative liabilities $(249) $51 $(198) $(86) $20 $(66) Net fair value derivative assets/(liabilities) $(206) $21 $(185) $(27) $(1) $(28) CECONY Fair value of derivative assets Current $26 $(16) $10 (b) $25 $(6) $19 (b) Noncurrent 4 (4) — 11 (5) 6 Total fair value of derivative assets $30 $(20) $10 $36 $(11) $25 Fair value of derivative liabilities Current $(66) $25 $(41) $(31) $6 $(25) Noncurrent (106) 20 (86) (12) 6 (6) Total fair value of derivative liabilities $(172) $45 $(127) $(43) $12 $(31) Net fair value derivative assets/(liabilities) $(142) $25 $(117) $(7) $1 $(6) (a) Derivative instruments and collateral were offset on the consolidated balance sheet as applicable under the accounting rules. The Companies enter into master agreements for their commodity derivatives. These agreements typically provide offset in the event of contract termination. In such case, generally the non-defaulting party’s payable will be offset by the defaulting party’s payable. The non-defaulting party will customarily notify the defaulting party within a specific time period and come to an agreement on the early termination amount. (b) At June 30, 2019 and December 31, 2018 , margin deposits for Con Edison ( $6 million and $7 million , respectively) and CECONY ( $6 million and $6 million , respectively) were classified as derivative assets on the consolidated balance sheet, but not included in the table. Margin is collateral, typically cash, that the holder of a derivative instrument is required to deposit in order to transact on an exchange and to cover its potential losses with its broker or the exchange. (c) Includes amounts for interest rate swaps of $(5) million in current liabilities and $(32) million in noncurrent liabilities. At June 30, 2019 the Clean Energy Businesses had interest rate swaps with notional amounts of $829 million . The expiration dates of the swaps range from 2024-2041. (d) Includes amounts for interest rate swaps of $2 million in noncurrent assets and $(6) million in noncurrent liabilities. At December 31, 2018 the Clean Energy Business had interest rate swaps with notional amounts of $499 million . The expiration dates of the swaps range from 2024-2035. The Utilities generally recover their prudently incurred fuel, purchased power and gas costs, including hedging gains and losses, in accordance with rate provisions approved by the applicable state utility regulators. In accordance with the accounting rules for regulated operations, the Utilities record a regulatory asset or liability to defer recognition of unrealized gains and losses on their electric and gas derivatives. As gains and losses are realized in future periods, they will be recognized as purchased power, gas and fuel costs in the Companies’ consolidated income statements. The Clean Energy Businesses record realized and unrealized gains and losses on their derivative contracts in purchased power, gas purchased for resale and non-utility revenue in the reporting period in which they occur. The Clean Energy Businesses record changes in the fair value of their interest rate swaps in other interest expense at the end of each reporting period. Management believes that these derivative instruments represent economic hedges that mitigate exposure to fluctuations in commodity prices and interest rates. The following table presents the realized and unrealized gains or losses on derivatives that have been deferred or recognized in earnings for the three and six months ended June 30, 2019 and 2018 : For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) Balance Sheet Location 2019 2018 2019 2018 Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: Current Deferred derivative gains $(16) $5 $(15) $6 Noncurrent Deferred derivative gains (2) 7 — 3 Total deferred gains/(losses) $(18) $12 $(15) $9 Current Deferred derivative losses $(36) $44 $(34) $42 Current Recoverable energy costs (41) (34) (37) (34) Noncurrent Deferred derivative losses (74) 59 (68) 56 Total deferred gains/(losses) $(151) $69 $(139) $64 Net deferred gains/(losses) $(169) $81 $(154) $73 Income Statement Location Pre-tax gains/(losses) recognized in income Purchased power expense $— $— $— $— Gas purchased for resale — (1) — — Non-utility revenue 7 (3) — — Other interest expense (24) — — — Total pre-tax gains/(losses) recognized in income $(17) $(4) $— $— For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) Balance Sheet Location 2019 2018 2019 2018 Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: Current Deferred derivative gains $(12) $(17) $(11) $(16) Noncurrent Deferred derivative gains (8) 5 (6) 3 Total deferred gains/(losses) $(20) $(12) $(17) $(13) Current Deferred derivative losses $(39) $(4) $(34) $(2) Current Recoverable energy costs (59) (9) (51) (8) Noncurrent Deferred derivative losses (100) 8 (95) 7 Total deferred gains/(losses) $(198) $(5) $(180) $(3) Net deferred gains/(losses) $(218) $(17) $(197) $(16) Income Statement Location Pre-tax gains/(losses) recognized in income Purchased power expense $— $— $— $— Gas purchased for resale (2) (1) — — Non-utility revenue 15 — — — Other operations and maintenance expense 1 — 1 — Other interest expense (34) — — — Total pre-tax gains/(losses) recognized in income $(20) ($1 ) $1 $— The following table presents the hedged volume of Con Edison’s and CECONY’s commodity derivative transactions at June 30, 2019 : Electric Energy (MWh) (a)(b) Capacity (MW) (a) Natural Gas (Dt) (a)(b) Refined Fuels (gallons) Con Edison 32,178,387 19,324 202,435,409 7,728,000 CECONY 29,476,875 8,550 187,910,000 7,728,000 (a) Volumes are reported net of long and short positions, except natural gas collars where the volumes of long positions are reported. (b) Excludes electric congestion and gas basis swap contracts, which are associated with electric and gas contracts and hedged volumes. The Companies are exposed to credit risk related to transactions entered into primarily for the various energy supply and hedging activities by the Utilities and the Clean Energy Businesses. Credit risk relates to the loss that may result from a counterparty’s nonperformance. The Companies use credit policies to manage this risk, including an established credit approval process, monitoring of counterparty limits, netting provisions within agreements, collateral or prepayment arrangements, credit insurance and credit default swaps. The Companies measure credit risk exposure as the replacement cost for open energy commodity and derivative positions plus amounts owed from counterparties for settled transactions. The replacement cost of open positions represents unrealized gains, net of any unrealized losses where the Companies have a legally enforceable right to offset. At June 30, 2019 , Con Edison and CECONY had $128 million and $7 million of credit exposure in connection with open energy supply net receivables and hedging activities, net of collateral, respectively. Con Edison’s net credit exposure consisted of $55 million with non-investment grade/non-rated counterparties, $34 million with independent system operators, $29 million with investment-grade counterparties and $10 million with commodity exchange brokers. CECONY’s net credit exposure consisted of $6 million with commodity exchange brokers and $1 million with investment-grade counterparties. The collateral requirements associated with, and settlement of, derivative transactions are included in net cash flows from operating activities in the Companies’ consolidated statement of cash flows. Most derivative instrument contracts contain provisions that may require a party to provide collateral on its derivative instruments that are in a net liability position. The amount of collateral to be provided will depend on the fair value of the derivative instruments and the party’s credit ratings. The following table presents the aggregate fair value of the Companies’ derivative instruments with credit-risk-related contingent features that are in a net liability position, the collateral posted for such positions and the additional collateral that would have been required to be posted had the lowest applicable credit rating been reduced one level and to below investment grade at June 30, 2019 : (Millions of Dollars) Con Edison (a) CECONY (a) Aggregate fair value – net liabilities $159 $137 Collateral posted 34 27 Additional collateral (b) (downgrade one level from current ratings) 37 31 Additional collateral (b) (downgrade to below investment grade from current ratings) 140 (c) 118 (c) (a) Non-derivative transactions for the purchase and sale of electricity and gas and qualifying derivative instruments, which have been designated as normal purchases or normal sales, are excluded from the table. These transactions primarily include purchases of electricity from independent system operators. In the event the Utilities and the Clean Energy Businesses were no longer extended unsecured credit for such purchases, the Companies would be required to post an immaterial amount of additional collateral at June 30, 2019 . For certain other such non-derivative transactions, the Companies could be required to post collateral under certain circumstances, including in the event counterparties had reasonable grounds for insecurity. (b) The Companies measure the collateral requirements by taking into consideration the fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position plus amounts owed to counterparties for settled transactions and amounts required by counterparties for minimum financial security. The fair value amounts represent unrealized losses, net of any unrealized gains where the Companies have a legally enforceable right to offset. (c) Derivative instruments that are net assets have been excluded from the table. At June 30, 2019 , if Con Edison had been downgraded to below investment grade, it would have been required to post additional collateral for such derivative instruments of $15 million .

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The accounting rules for fair value measurements and disclosures define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in a principal or most advantageous market. Fair value is a market-based measurement that is determined based on inputs, which refer broadly to assumptions that market participants use in pricing assets or liabilities. These inputs can be readily observable, market corroborated, or generally unobservable firm inputs. The Companies often make certain assumptions that market participants would use in pricing the asset or liability, including assumptions about risk, and the risks inherent in the inputs to valuation techniques. The Companies use valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. The accounting rules for fair value measurements and disclosures established a fair value hierarchy, which prioritizes the inputs to valuation techniques used to measure fair value in three broad levels. The rules require that assets and liabilities be classified in their entirety based on the level of input that is significant to the fair value measurement. Assessing the significance of a particular input may require judgment considering factors specific to the asset or liability, and may affect the valuation of the asset or liability and their placement within the fair value hierarchy. The Companies classify fair value balances based on the fair value hierarchy defined by the accounting rules for fair value measurements and disclosures as follows: • Level 1 – Consists of assets or liabilities whose value is based on unadjusted quoted prices in active markets at the measurement date. An active market is one in which transactions for assets or liabilities occur with sufficient frequency and volume to provide pricing information on an ongoing basis. This category includes contracts traded on active exchange markets valued using unadjusted prices quoted directly from the exchange. • Level 2 – Consists of assets or liabilities valued using industry standard models and based on prices, other than quoted prices within Level 1, that are either directly or indirectly observable as of the measurement date. The industry standard models consider observable assumptions including time value, volatility factors and current market and contractual prices for the underlying commodities, in addition to other economic measures. This category includes contracts traded on active exchanges or in over-the-counter markets priced with industry standard models. • Level 3 – Consists of assets or liabilities whose fair value is estimated based on internally developed models or methodologies using inputs that are generally less readily observable and supported by little, if any, market activity at the measurement date. Unobservable inputs are developed based on the best available information and subject to cost benefit constraints. This category includes contracts priced using models that are internally developed and contracts placed in illiquid markets. It also includes contracts that expire after the period of time for which quoted prices are available and internal models are used to determine a significant portion of the value. Assets and liabilities measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018 are summarized below. 2019 2018 (Millions of Dollars) Level 1 Level 2 Level 3 Netting Adjustment (e) Total Level 1 Level 2 Level 3 Netting Adjustment (e) Total Con Edison Derivative assets: Commodity (a)(b)(c) $3 $22 $2 $(8) $19 $6 $36 $7 $(6) $43 Interest rate swaps (a)(b)(c) — — — — — — 2 — — 2 Other (a)(b)(d) 321 118 — — 439 287 114 — — 401 Total assets $324 $140 $2 $(8) $458 $293 $152 $7 $(6) $446 Derivative liabilities: Commodity (a)(b)(c) $15 $135 $48 $(37) $161 $8 $43 $20 $(11) $60 Interest rate swaps (a)(b)(c) — 37 — — 37 — 6 — — 6 Total liabilities $15 $172 $48 $(37) $198 $8 $49 $20 $(11) $66 CECONY Derivative assets: Commodity (a)(b)(c) $2 $13 $1 $— $16 $3 $28 $1 $(1) $31 Other (a)(b)(d) 301 112 — — 413 267 109 — — 376 Total assets $303 $125 $1 $— $429 $270 $137 $1 $(1) $407 Derivative liabilities: Commodity (a)(b)(c) $13 $114 $31 $(31) $127 $5 $30 $3 $(6) $32 (a) The Companies’ policy is to review the fair value hierarchy and recognize transfers into and transfers out of the levels at the end of each reporting period. Con Edison and CECONY had no transfers between levels 1, 2, and 3 during the six months ended June 30, 2019 . Con Edison and CECONY had $2 million of commodity derivative liabilities transferred from level 3 to level 2 during the year ended December 31, 2018 because of availability of observable market data due to the decrease in the terms of certain contracts from beyond three years as of September 30, 2018 to less than three years as of December 31, 2018 . (b) Level 2 assets and liabilities include investments held in the deferred compensation plan and/or non-qualified retirement plans, exchange-traded contracts where there is insufficient market liquidity to warrant inclusion in Level 1, certain over-the-counter derivative instruments for electricity, refined products and natural gas. Derivative instruments classified as Level 2 are valued using industry standard models that incorporate corroborated observable inputs; such as pricing services or prices from similar instruments that trade in liquid markets, time value and volatility factors. (c) The accounting rules for fair value measurements and disclosures require consideration of the impact of nonperformance risk (including credit risk) from a market participant perspective in the measurement of the fair value of assets and liabilities. At June 30, 2019 and December 31, 2018 , the Companies determined that nonperformance risk would have no material impact on their financial position or results of operations. (d) Other assets are comprised of assets such as life insurance contracts within the deferred compensation plan and non-qualified retirement plans. (e) Amounts represent the impact of legally-enforceable master netting agreements that allow the Companies to net gain and loss positions and cash collateral held or placed with the same counterparties. The employees in the Companies’ risk management group develop and maintain the Companies’ valuation policies and procedures for, and verify pricing and fair value valuation of, commodity derivatives and interest rate swaps. Under the Companies’ policies and procedures, multiple independent sources of information are obtained for forward price curves used to value commodity derivatives and interest rate swaps. Fair value and changes in fair value of commodity derivatives and interest rate swaps are reported on a monthly basis to the Companies’ risk committees, comprised of officers and employees of the Companies that oversee energy hedging at the Utilities and the Clean Energy Businesses. The risk management group reports to the Companies’ Vice President and Treasurer. Fair Value of Level 3 at June 30, 2019 Valuation Techniques Unobservable Inputs Range (Millions of Dollars) Con Edison – Commodity Electricity $(27) Discounted Cash Flow Forward energy prices (a) $20.00-$71.70 per MWh (16) Discounted Cash Flow Forward capacity prices (a) $0.70-$4.83 per kW-month Natural Gas (4) Discounted Cash Flow Forward natural gas prices (a) $1.45-$2.31 per Dt Transmission Congestion Contracts/Financial Transmission Rights 1 Discounted Cash Flow Inter-zonal forward price curves adjusted for historical zonal losses (b) $0.03-$4.29 per MWh Total Con Edison—Commodity $(46) CECONY – Commodity Electricity $(25) Discounted Cash Flow Forward energy prices (a) $21.70-$71.70 per MWh (6) Discounted Cash Flow Forward capacity prices (a) $0.70-$4.80 per kW-month Transmission Congestion Contracts 1 Discounted Cash Flow Inter-zonal forward price curves adjusted for historical zonal losses (b) $0.43-$3.13 per MWh Total CECONY—Commodity $(30) (a) Generally, increases/(decreases) in this input in isolation would result in a higher/(lower) fair value measurement. (b) Generally, increases/(decreases) in this input in isolation would result in a lower/(higher) fair value measurement. The table listed below provides a reconciliation of the beginning and ending net balances for assets and liabilities measured at fair value as of June 30, 2019 and 2018 and classified as Level 3 in the fair value hierarchy: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Beginning balance as of April 1, $(19) $3 $(5) $2 Included in earnings — (3) 1 1 Included in regulatory assets and liabilities (27) (1) (25) (2) Settlements — (3) (1) (1) Ending balance as of June 30, $(46) $(4) $(30) $— For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Beginning balance as of January 1, $(13) $1 $(2) $4 Included in earnings (4) 1 1 3 Included in regulatory assets and liabilities (31) (1) (28) (5) Settlements 2 (6) (1) (3) Transfer out of level 3 — 1 — 1 Ending balance as of June 30, $(46) $(4) $(30) $— For the Utilities, realized gains and losses on Level 3 commodity derivative assets and liabilities are reported as part of purchased power, gas and fuel costs. The Utilities generally recover these costs in accordance with rate provisions approved by the applicable state public utilities regulators. Unrealized gains and losses for commodity derivatives are generally deferred on the consolidated balance sheet in accordance with the accounting rules for regulated operations. For the Clean Energy Businesses, realized and unrealized gains and losses on Level 3 commodity derivative assets and liabilities are reported in non-utility revenues (immaterial and $6 million loss) and purchased power costs (immaterial for both periods) on the consolidated income statement for the three months ended June 30, 2019 and 2018 , respectively. Realized and unrealized gains and losses on Level 3 commodity derivative assets and liabilities are reported in non-utility revenues ( $1 million loss and $4 million loss) and purchased power costs (immaterial for both periods) on the consolidated income statement for the six months ended June 30, 2019 and 2018 , respectively. The change in fair value relating to Level 3 commodity derivative assets and liabilities held at June 30, 2019 and 2018 is included in non-utility revenues (immaterial and $5 million loss) and purchased power costs (immaterial for both periods) on the consolidated income statement for the three months ended June 30, 2019 and 2018 , respectively. For the six months ended June 30, 2019 and 2018 , the change in fair value relating to Level 3 commodity derivatives assets and liabilities is included in non-utility revenues ( $1 million loss and $4 million loss) and purchased power costs (immaterial for both periods), respectively, on the consolidated income statement.

Variable Interest Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2019
Equity Method Investments and Joint Ventures [Abstract]
Variable Interest Entities	Variable Interest Entities The accounting rules for consolidation address the consolidation of a variable interest entity (VIE) by a business enterprise that is the primary beneficiary. A VIE is an entity that does not have a sufficient equity investment at risk to permit it to finance its activities without additional subordinated financial support, or whose equity investors lack the characteristics of a controlling financial interest. The primary beneficiary is the business enterprise that has the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and either absorbs a significant amount of the VIE’s losses or has the right to receive benefits that could be significant to the VIE. The Companies enter into arrangements including leases, partnerships and electricity purchase agreements, with various entities. As a result of these arrangements, the Companies retain or may retain a variable interest in these entities. CECONY CECONY has an ongoing long-term electricity purchase agreement with Brooklyn Navy Yard Cogeneration Partners, LP, a potential VIE. In 2018, a request was made of this counterparty for information necessary to determine whether the entity was a VIE and whether CECONY is the primary beneficiary; however, the information was not made available. The payments for this contract constitute CECONY’s maximum exposure to loss with respect to the potential VIE. Con Edison Development Con Edison has a variable interest in OCI Solar San Antonio 4 LLC (Texas Solar 4), which is a consolidated entity in which Con Edison Development has an 80 percent membership interest. Con Edison is the primary beneficiary since the power to direct the activities that most significantly impact the economics of Texas Solar 4 is held by a Con Edison Development subsidiary. Texas Solar 4 owns a project company that developed a 40 MW (AC) solar electric production project. Electricity generated by the project is sold pursuant to a long-term power purchase agreement. Con Edison's earnings from Texas Solar 4 for the three and six months ended June 30, 2019 and 2018 were immaterial. In December 2018, a Con Edison Development subsidiary completed its acquisition of Sempra Solar Holdings, LLC. Included in the acquisition were certain operating projects (Tax Equity Projects) with a noncontrolling tax equity investor to which a percentage of earnings, tax attributes and cash flows are allocated. The Tax Equity Projects are consolidated entities in which Con Edison has less than a 100 percent membership interest. Con Edison is the primary beneficiary since the power to direct the activities that most significantly impact the economics of the Tax Equity Projects is held by Con Edison Development subsidiaries. Electricity generated by the Tax Equity Projects is sold to utilities and municipalities pursuant to long-term power purchase agreements. For the three months ended June 30, 2019, the hypothetical liquidation at book value (HLBV) method of accounting for the Tax Equity Projects resulted in $28 million of income ( $21 million , after tax) for the tax equity investor and a $15 million loss ( $12 million , after tax) for Con Edison. For the six months ended June 30, 2019 , the HLBV method of accounting for the Tax Equity Projects resulted in $49 million of income ( $37 million , after-tax) for the tax equity investor and a $34 million loss ( $26 million , after-tax) for Con Edison. At June 30, 2019 and December 31, 2018 , Con Edison’s consolidated balance sheet included the following amounts associated with its VIEs: Tax Equity Projects Great Valley Solar Copper Mountain - Mesquite Solar Texas Solar 4 (Millions of Dollars) 2019 2018 2019 2018 2019 2018 Restricted cash $— $— $— $— $7 $4 Non-utility property, less accumulated depreciation (g)(h) 309 313 488 492 96 98 Other assets 39 18 109 97 10 9 Total assets (a) $348 $331 $597 $589 $113 $111 Long-term debt due within one year $— $— $— $— $57 $2 Other liabilities 32 17 43 33 28 26 Long-term debt — — — — — 56 Total liabilities (b) $32 $17 $43 $33 $85 $84 (a) The assets of the Tax Equity Projects and Texas Solar 4 represent assets of a consolidated VIE that can be used only to settle obligations of the consolidated VIE. (b) The liabilities of the Tax Equity Projects and Texas Solar 4 represent liabilities of a consolidated VIE for which creditors do not have recourse to the general credit of the primary beneficiary. (c) Con Edison did not provide any financial or other support during the year that was not previously contractually required. (d) Great Valley Solar consists of the Great Valley Solar 1, Great Valley Solar 2, Great Valley Solar 3 and Great Valley Solar 4 projects, for which the noncontrolling interest of the tax equity investor was $48 million and $33 million at June 30, 2019 and December 31, 2018, respectively. (e) Copper Mountain - Mesquite Solar consists of the Copper Mountain Solar 4, Mesquite Solar 2 and Mesquite Solar 3 projects for which the noncontrolling interest of the tax equity investor was $99 million and $71 million at June 30, 2019 and December 31, 2018 , respectively. (f) Noncontrolling interest of the third party was $7 million at June 30, 2019 and December 31, 2018 . (g) Non-utility property is reduced by accumulated depreciation of $5 million for Great Valley Solar, $8 million for Copper Mountain - Mesquite Solar and $17 million for Texas Solar 4 at June 30, 2019 . (h) Non-utility property is reduced by accumulated depreciation of $1 million for Great Valley Solar, $1 million for Copper Mountain - Mesquite Solar and $15 million for Texas Solar 4 at December 31, 2018.

New Financial Accounting Standa

New Financial Accounting Standards	6 Months Ended
	Jun. 30, 2019
Accounting Changes and Error Corrections [Abstract]
New Financial Accounting Standards	New Financial Accounting Standards In June 2016, the FASB issued amendments to the guidance for recognition of credit losses for financial instruments through ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” The amendments replace the incurred loss impairment methodology which involved delayed recognition of credit losses. The amendments introduce an expected credit loss impairment model which requires immediate recognition of anticipated losses over the instrument’s life. A broader range of reasonable and supportable information must be considered in developing the credit loss estimates. The Companies' financial instruments that would be subject to the amendments include their accounts receivable - customers and other receivables. For public entities, the amendments are effective, and the Companies plan to adopt the amendments, for reporting periods beginning after December 15, 2019. The adoption of this guidance is not expected to have a material impact on the Companies’ liquidity. The Companies are continuing to evaluate the potential impact of the amendments on the Companies’ results of operations and financial position. In January 2017, the FASB issued amendments to the guidance for the subsequent measurement of goodwill through ASU 2017-04, “Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” The amendments in this update simplify goodwill impairment testing by eliminating Step 2 of the goodwill impairment test wherein an entity has to compute the implied fair value of goodwill by performing procedures to determine the fair value of its assets and liabilities. Under the new guidance, an entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value up to the total amount of goodwill allocated to that reporting unit. For public entities, the amendments are effective for reporting periods beginning after December 15, 2019. Early adoption is permitted. The application of this guidance is not expected to have a material impact on the Companies’ financial position, results of operations and liquidity. In August 2018, the FASB issued amendments to the guidance for internal use software through ASU 2018-15, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract.” The amendments align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. For public entities, the amendments are effective for reporting periods beginning after December 15, 2019, with early adoption permitted. The Companies elected to adopt the amendments in 2018, prospectively for all in-scope implementation costs incurred after the date of adoption. The impact of adoption on the Companies’ financial position, results of operations and liquidity was immaterial.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies and Other Matters (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
New Financial Accounting Standards	New Financial Accounting Standards In June 2016, the FASB issued amendments to the guidance for recognition of credit losses for financial instruments through ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” The amendments replace the incurred loss impairment methodology which involved delayed recognition of credit losses. The amendments introduce an expected credit loss impairment model which requires immediate recognition of anticipated losses over the instrument’s life. A broader range of reasonable and supportable information must be considered in developing the credit loss estimates. The Companies' financial instruments that would be subject to the amendments include their accounts receivable - customers and other receivables. For public entities, the amendments are effective, and the Companies plan to adopt the amendments, for reporting periods beginning after December 15, 2019. The adoption of this guidance is not expected to have a material impact on the Companies’ liquidity. The Companies are continuing to evaluate the potential impact of the amendments on the Companies’ results of operations and financial position. In January 2017, the FASB issued amendments to the guidance for the subsequent measurement of goodwill through ASU 2017-04, “Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” The amendments in this update simplify goodwill impairment testing by eliminating Step 2 of the goodwill impairment test wherein an entity has to compute the implied fair value of goodwill by performing procedures to determine the fair value of its assets and liabilities. Under the new guidance, an entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value up to the total amount of goodwill allocated to that reporting unit. For public entities, the amendments are effective for reporting periods beginning after December 15, 2019. Early adoption is permitted. The application of this guidance is not expected to have a material impact on the Companies’ financial position, results of operations and liquidity. In August 2018, the FASB issued amendments to the guidance for internal use software through ASU 2018-15, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract.” The amendments align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. For public entities, the amendments are effective for reporting periods beginning after December 15, 2019, with early adoption permitted. The Companies elected to adopt the amendments in 2018, prospectively for all in-scope implementation costs incurred after the date of adoption. The impact of adoption on the Companies’ financial position, results of operations and liquidity was immaterial.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies and Other Matters (Tables)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Disaggregation of Revenue	The following table presents, for the three and six months ended June 30, 2019 and 2018 , revenue from contracts with customers as defined in Accounting Standards Codification (ASC) Topic 606, "Revenue from Contracts with Customers," as well as additional revenue from sources other than contracts with customers, disaggregated by major source. For the Three Months Ended June 30, 2019 For the Three Months Ended June 30, 2018 (Millions of Dollars) Revenues from contracts with customers Other revenues (a) Total operating revenues Revenues from contracts with customers Other revenues (a) Total operating revenues CECONY Electric $1,751 $82 $1,833 $1,771 $36 $1,807 Gas 400 8 408 428 7 435 Steam 86 4 90 93 3 96 Total CECONY $2,237 $94 $2,331 $2,292 $46 $2,338 O&R Electric 140 (2) 138 146 (2) 144 Gas 39 2 41 47 7 54 Total O&R $179 $— $179 $193 $5 $198 Clean Energy Businesses Renewables 171 (b) — 171 73 (b) — 73 Energy services 16 — 16 23 — 23 Other — 46 46 — 62 62 Total Clean Energy Businesses $187 $46 $233 $96 $62 $158 Con Edison Transmission 1 — 1 1 — 1 Other (c) — — — — 1 1 Total Con Edison $2,604 $140 $2,744 $2,582 $114 $2,696 (a) For the Utilities, this includes revenue from alternative revenue programs, such as the revenue decoupling mechanisms under their New York electric and gas rate plans. For the Clean Energy Businesses, this includes revenue from wholesale services. (b) Included within the totals for Renewables revenue at the Clean Energy Businesses is $4 million and $9 million for the three months ended June 30, 2019 and 2018 , respectively, of revenue related to engineering, procurement and construction services. (c) P arent company and consolidation adjustments. For the Six Months Ended June 30, 2019 For the Six Months Ended June 30, 2018 Revenues from contracts with customers Other revenues (a) Total operating revenues Revenues from contracts with customers Other revenues (a) Total operating revenues CECONY Electric $3,465 $165 $3,630 $3,474 $62 $3,536 Gas 1,310 20 1,330 1,252 24 1,276 Steam 402 9 411 404 6 410 Total CECONY $5,177 $194 $5,371 $5,130 $92 $5,222 O&R Electric 283 — 283 293 — 293 Gas 153 1 154 148 4 152 Total O&R $436 $1 $437 $441 $4 $445 Clean Energy Businesses Renewables 278 (b) — 278 205 (b) — 205 Energy services 39 — 39 41 — 41 Other — 133 133 — 145 145 Total Clean Energy Businesses $317 $133 $450 $246 $145 $391 Con Edison Transmission 2 — 2 2 — 2 Other (c) — (2) (2) — — — Total Con Edison $5,932 $326 $6,258 $5,819 $241 $6,060 (a) For the Utilities, this includes revenue from alternative revenue programs, such as the revenue decoupling mechanisms under their New York electric and gas rate plans. For the Clean Energy Businesses, this includes revenue from wholesale services. (b) Included within the totals for Renewables revenue at the Clean Energy Businesses is $6 million and $97 million for the six months ended June 30, 2019 and 2018 , respectively, of revenue related to engineering, procurement and construction services. (c) P arent company and consolidation adjustments.
Change in Unbilled Contract and Unearned Revenues	2019 2018 (Millions of Dollars) Unbilled contract revenue (a) Unearned revenue (b) Unbilled contract revenue (a) Unearned revenue (b) Beginning balance as of January 1, $29 $20 $58 $87 Additions (c) 44 — 73 31 Subtractions (c) 38 2 (d) 88 105 (d) Ending balance as of June 30, $35 $18 $43 $13 (a) Unbilled contract revenue represents accumulated incurred costs and earned profits on contracts (revenue arrangements), which have been recorded as revenue, but have not yet been billed to customers, and which represent contract assets as defined in Topic 606. Substantially all accrued unbilled contract revenue is expected to be collected within one year. Unbilled contract revenue arises from the cost-to-cost method of revenue recognition. Unbilled contract revenue from fixed-price type contracts is converted to billed receivables when amounts are invoiced to customers according to contractual billing terms, which generally occur when deliveries or other performance milestones are completed. (b) Unearned revenue represents a liability for billings to customers in excess of earned revenue, which are contract liabilities as defined in Topic 606. (c) Additions for unbilled contract revenue and subtractions for unearned revenue represent additional revenue earned. Additions for unearned revenue and subtractions for unbilled contract revenue represent billings. Activity also includes appropriate balance sheet classification for the period. (d) Of the subtractions from unearned revenue, $2 million and $50 million were included in the balance as of January 1, 2019 and 2018, respectively.
Basic and Diluted Earnings Per Share	For the three and six months ended June 30, 2019 and 2018 , basic and diluted EPS for Con Edison are calculated as follows: For the Three Months Ended June 30, For the Six Months Ended June 30, (Millions of Dollars, except per share amounts/Shares in Millions) 2019 2018 2019 2018 Net income for common stock $152 $188 $576 $616 Weighted average common shares outstanding – basic 328.3 310.8 325.2 310.6 Add: Incremental shares attributable to effect of potentially dilutive securities 0.9 1.1 0.9 1.1 Adjusted weighted average common shares outstanding – diluted 329.2 311.9 326.1 311.7 Net Income per common share – basic $0.46 $0.60 $1.77 $1.98 Net Income per common share – diluted $0.46 $0.60 $1.77 $1.98
Changes in Accumulated Other Comprehensive Income/(Loss)	For the three and six months ended June 30, 2019 and 2018 , changes to accumulated other comprehensive income/(loss) (OCI) for Con Edison and CECONY are as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Beginning balance, accumulated OCI, net of taxes (a) $(12) $(22) $(5) $(6) Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2018 (a)(b) 1 2 — 1 Current period OCI, net of taxes 1 2 — 1 Ending balance, accumulated OCI, net of taxes $(11) $(20) $(5) $(5) For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Beginning balance, accumulated OCI, net of taxes (a) $(16) $(26) $(5) $(6) OCI before reclassifications, net of tax of $(1) for Con Edison in 2019 and 2018 2 3 — — Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2019 and 2018 (a)(b) 3 3 — 1 Current period OCI, net of taxes 5 6 — 1 Ending balance, accumulated OCI, net of taxes $(11) $(20) $(5) $(5) (a) Tax reclassified from accumulated OCI is reported in the income tax expense line item of the consolidated income statement. (b) For the portion of unrecognized pension and other postretirement benefit costs relating to the Utilities, costs are recorded into, and amortized out of, regulatory assets instead of OCI. The net actuarial losses and prior service costs recognized during the period are included in the computation of total periodic pension and other postretirement benefit cost. See Notes E and F.
Restrictions on Cash and Cash Equivalents	At June 30, 2019 and 2018 , cash, temporary cash investments and restricted cash for Con Edison and CECONY are as follows: At June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Cash and temporary cash investments $831 $866 $786 $829 Restricted cash (a) 139 55 — — Total cash, temporary cash investments and restricted cash $970 $921 $786 $829 (a) Restricted cash included cash of Con Edison Development renewable electric production project subsidiaries ( $138 million and $54 million at June 30, 2019 and 2018 , respectively) that, under the related project debt agreements, is restricted until the various maturity dates of the project debt to being used for normal operating expenses and capital expenditures, debt service, and required reserves. During the pendency of the PG&E bankruptcy, unless the lenders for the related project debt otherwise agree, cash may not be distributed from the related projects to Con Edison Development. See “Long-Lived and Intangible Assets,” above, and Note C. In addition, restricted cash included O&R's New Jersey utility subsidiary, Rockland Electric Company transition bond charge collections, net of principal, interest, trustee and service fees ( $1 million at June 30, 2019 and 2018 ) .
Schedule of Cash and Cash Equivalents	At June 30, 2019 and 2018 , cash, temporary cash investments and restricted cash for Con Edison and CECONY are as follows: At June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Cash and temporary cash investments $831 $866 $786 $829 Restricted cash (a) 139 55 — — Total cash, temporary cash investments and restricted cash $970 $921 $786 $829 (a) Restricted cash included cash of Con Edison Development renewable electric production project subsidiaries ( $138 million and $54 million at June 30, 2019 and 2018 , respectively) that, under the related project debt agreements, is restricted until the various maturity dates of the project debt to being used for normal operating expenses and capital expenditures, debt service, and required reserves. During the pendency of the PG&E bankruptcy, unless the lenders for the related project debt otherwise agree, cash may not be distributed from the related projects to Con Edison Development. See “Long-Lived and Intangible Assets,” above, and Note C. In addition, restricted cash included O&R's New Jersey utility subsidiary, Rockland Electric Company transition bond charge collections, net of principal, interest, trustee and service fees ( $1 million at June 30, 2019 and 2018 ) .

Regulatory Matters (Tables)

Regulatory Matters (Tables)	6 Months Ended
	Jun. 30, 2019
Regulated Operations [Abstract]
Schedule of Regulatory Assets	Regulatory assets and liabilities at June 30, 2019 and December 31, 2018 were comprised of the following items: Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Regulatory assets Unrecognized pension and other postretirement costs $2,042 $2,238 $1,934 $2,111 Environmental remediation costs 787 810 696 716 Revenue taxes 304 291 291 278 MTA power reliability deferral 241 229 241 229 Property tax reconciliation 127 101 115 86 Deferred derivative losses 117 17 106 11 Municipal infrastructure support costs 76 67 76 67 Pension and other postretirement benefits deferrals 73 73 54 56 Deferred storm costs 72 76 — — System peak reduction and energy efficiency programs 48 72 47 70 Meadowlands heater odorization project 35 36 35 36 Brooklyn Queens demand management program 34 39 34 39 Unamortized loss on reacquired debt 32 36 30 34 Preferred stock redemption 23 23 23 23 Recoverable REV demonstration project costs 20 20 18 18 Gate station upgrade project 17 17 17 17 Workers’ compensation 4 5 4 5 O&R transition bond charges 1 2 — — Indian Point Energy Center program costs — 13 — 13 Other 184 129 173 114 Regulatory assets – noncurrent 4,237 4,294 3,894 3,923 Deferred derivative losses 75 36 63 29 Recoverable energy costs 22 40 19 35 Regulatory assets – current 97 76 82 64 Total Regulatory Assets $4,334 $4,370 $3,976 $3,987 Regulatory liabilities Future income tax $2,470 $2,515 $2,323 $2,363 Allowance for cost of removal less salvage 947 928 805 790 TCJA net benefits* 449 434 429 411 Net unbilled revenue deferrals 155 117 155 117 Energy efficiency portfolio standard unencumbered funds 124 127 119 122 Pension and other postretirement benefit deferrals 63 62 39 40 Net proceeds from sale of property 45 6 45 6 Property tax refunds 45 45 45 45 System benefit charge carrying charge 37 27 33 24 Earnings sharing - electric, gas and steam 25 36 17 27 Settlement of prudence proceeding 22 37 22 37 BQDM and REV Demo reconciliations 22 18 22 18 Settlement of gas proceedings 12 15 12 15 Carrying charges on repair allowance and bonus depreciation 10 21 9 21 New York State income tax rate change 8 17 8 17 Unrecognized other postretirement costs 8 7 3 7 Base rate change deferrals 4 10 4 10 Property tax reconciliation 2 36 2 36 Other 156 183 122 152 Regulatory liabilities – noncurrent 4,604 4,641 4,214 4,258 Refundable energy costs 50 31 22 8 Revenue decoupling mechanism 36 53 22 36 Deferred derivative gains 18 30 17 29 Regulatory liabilities – current 104 114 61 73 Total Regulatory Liabilities $4,708 $4,755 $4,275 $4,331 * See "Other Regulatory Matters," above.
Schedule of Regulatory Liabilities	Regulatory assets and liabilities at June 30, 2019 and December 31, 2018 were comprised of the following items: Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Regulatory assets Unrecognized pension and other postretirement costs $2,042 $2,238 $1,934 $2,111 Environmental remediation costs 787 810 696 716 Revenue taxes 304 291 291 278 MTA power reliability deferral 241 229 241 229 Property tax reconciliation 127 101 115 86 Deferred derivative losses 117 17 106 11 Municipal infrastructure support costs 76 67 76 67 Pension and other postretirement benefits deferrals 73 73 54 56 Deferred storm costs 72 76 — — System peak reduction and energy efficiency programs 48 72 47 70 Meadowlands heater odorization project 35 36 35 36 Brooklyn Queens demand management program 34 39 34 39 Unamortized loss on reacquired debt 32 36 30 34 Preferred stock redemption 23 23 23 23 Recoverable REV demonstration project costs 20 20 18 18 Gate station upgrade project 17 17 17 17 Workers’ compensation 4 5 4 5 O&R transition bond charges 1 2 — — Indian Point Energy Center program costs — 13 — 13 Other 184 129 173 114 Regulatory assets – noncurrent 4,237 4,294 3,894 3,923 Deferred derivative losses 75 36 63 29 Recoverable energy costs 22 40 19 35 Regulatory assets – current 97 76 82 64 Total Regulatory Assets $4,334 $4,370 $3,976 $3,987 Regulatory liabilities Future income tax $2,470 $2,515 $2,323 $2,363 Allowance for cost of removal less salvage 947 928 805 790 TCJA net benefits* 449 434 429 411 Net unbilled revenue deferrals 155 117 155 117 Energy efficiency portfolio standard unencumbered funds 124 127 119 122 Pension and other postretirement benefit deferrals 63 62 39 40 Net proceeds from sale of property 45 6 45 6 Property tax refunds 45 45 45 45 System benefit charge carrying charge 37 27 33 24 Earnings sharing - electric, gas and steam 25 36 17 27 Settlement of prudence proceeding 22 37 22 37 BQDM and REV Demo reconciliations 22 18 22 18 Settlement of gas proceedings 12 15 12 15 Carrying charges on repair allowance and bonus depreciation 10 21 9 21 New York State income tax rate change 8 17 8 17 Unrecognized other postretirement costs 8 7 3 7 Base rate change deferrals 4 10 4 10 Property tax reconciliation 2 36 2 36 Other 156 183 122 152 Regulatory liabilities – noncurrent 4,604 4,641 4,214 4,258 Refundable energy costs 50 31 22 8 Revenue decoupling mechanism 36 53 22 36 Deferred derivative gains 18 30 17 29 Regulatory liabilities – current 104 114 61 73 Total Regulatory Liabilities $4,708 $4,755 $4,275 $4,331 * See "Other Regulatory Matters," above.

Capitalization (Tables)

Capitalization (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Carrying Amounts and Fair Values of Long-Term Debt	The carrying amounts and fair values of long-term debt at June 30, 2019 and December 31, 2018 were: (Millions of Dollars) 2019 2018 Long-Term Debt (including current portion) (a) Carrying Amount Fair Value Carrying Amount Fair Value Con Edison $19,468 $21,626 $18,145 $18,740 CECONY $14,373 $16,330 $14,151 $14,685 (a) Amounts shown are net of unamortized debt expense and unamortized debt discount of $192 million and $142 million for Con Edison and CECONY, respectively, as of June 30, 2019 and $185 million and $139 million for Con Edison and CECONY, respectively, as of December 31, 2018 .

Pension Benefits (Tables)

Pension Benefits (Tables)	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Total Periodic Benefit Costs	The components of the Companies’ total periodic benefit cost for the three and six months ended June 30, 2019 and 2018 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Service cost – including administrative expenses $62 $72 $58 $68 Interest cost on projected benefit obligation 150 140 141 131 Expected return on plan assets (247) (258) (234) (245) Recognition of net actuarial loss 130 172 123 163 Recognition of prior service cost/(credit) (4) (4) (5) (5) TOTAL PERIODIC BENEFIT COST $91 $122 $83 $112 Cost capitalized (29) (31) (27) (29) Reconciliation to rate level (2) (23) (1) (25) Total expense recognized $60 $68 $55 $58 For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Service cost – including administrative expenses $125 $145 $117 $136 Interest cost on projected benefit obligation 301 280 282 263 Expected return on plan assets (494) (516) (468) (490) Recognition of net actuarial loss 259 344 246 326 Recognition of prior service cost/(credit) (9) (9) (10) (10) TOTAL PERIODIC BENEFIT COST $182 $244 $167 $225 Cost capitalized (55) (62) (52) (59) Reconciliation to rate level (7) (46) (6) (50) Total expense recognized $120 $136 $109 $116 The components of the Companies’ total periodic other postretirement benefit cost/(credit) for the three and six months ended June 30, 2019 and 2018 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Service cost $4 $5 $3 $3 Interest cost on accumulated other postretirement benefit obligation 11 11 9 9 Expected return on plan assets (16) (18) (14) (16) Recognition of net actuarial loss/(gain) (2) 2 (2) 1 Recognition of prior service cost/(credit) (1) (2) — (1) TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT) $(4) $(2) $(4) $(4) Cost capitalized (2) (2) (2) (1) Reconciliation to rate level 3 2 2 2 Total expense/(credit) recognized $(3) $(2) $(4) $(3) For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Service cost $9 $10 $6 $7 Interest cost on accumulated other postretirement benefit obligation 22 21 18 17 Expected return on plan assets (33) (37) (27) (31) Recognition of net actuarial loss/(gain) (4) 4 (5) 1 Recognition of prior service cost/(credit) (2) (3) (1) (1) TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT) $(8) $(5) $(9) $(7) Cost capitalized (4) (4) (3) (3) Reconciliation to rate level 7 5 4 5 Total expense/(credit) recognized $(5) $(4) $(8) $(5)

Other Postretirement Benefits (

Other Postretirement Benefits (Tables)	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Total Periodic Benefit Costs	The components of the Companies’ total periodic benefit cost for the three and six months ended June 30, 2019 and 2018 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Service cost – including administrative expenses $62 $72 $58 $68 Interest cost on projected benefit obligation 150 140 141 131 Expected return on plan assets (247) (258) (234) (245) Recognition of net actuarial loss 130 172 123 163 Recognition of prior service cost/(credit) (4) (4) (5) (5) TOTAL PERIODIC BENEFIT COST $91 $122 $83 $112 Cost capitalized (29) (31) (27) (29) Reconciliation to rate level (2) (23) (1) (25) Total expense recognized $60 $68 $55 $58 For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Service cost – including administrative expenses $125 $145 $117 $136 Interest cost on projected benefit obligation 301 280 282 263 Expected return on plan assets (494) (516) (468) (490) Recognition of net actuarial loss 259 344 246 326 Recognition of prior service cost/(credit) (9) (9) (10) (10) TOTAL PERIODIC BENEFIT COST $182 $244 $167 $225 Cost capitalized (55) (62) (52) (59) Reconciliation to rate level (7) (46) (6) (50) Total expense recognized $120 $136 $109 $116 The components of the Companies’ total periodic other postretirement benefit cost/(credit) for the three and six months ended June 30, 2019 and 2018 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Service cost $4 $5 $3 $3 Interest cost on accumulated other postretirement benefit obligation 11 11 9 9 Expected return on plan assets (16) (18) (14) (16) Recognition of net actuarial loss/(gain) (2) 2 (2) 1 Recognition of prior service cost/(credit) (1) (2) — (1) TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT) $(4) $(2) $(4) $(4) Cost capitalized (2) (2) (2) (1) Reconciliation to rate level 3 2 2 2 Total expense/(credit) recognized $(3) $(2) $(4) $(3) For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Service cost $9 $10 $6 $7 Interest cost on accumulated other postretirement benefit obligation 22 21 18 17 Expected return on plan assets (33) (37) (27) (31) Recognition of net actuarial loss/(gain) (4) 4 (5) 1 Recognition of prior service cost/(credit) (2) (3) (1) (1) TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT) $(8) $(5) $(9) $(7) Cost capitalized (4) (4) (3) (3) Reconciliation to rate level 7 5 4 5 Total expense/(credit) recognized $(5) $(4) $(8) $(5)

Environmental Matters (Tables)

Environmental Matters (Tables)	6 Months Ended
	Jun. 30, 2019
Environmental Remediation Obligations [Abstract]
Accrued Liabilities and Regulatory Assets	The accrued liabilities and regulatory assets related to Superfund Sites at June 30, 2019 and December 31, 2018 were as follows: Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Accrued Liabilities: Manufactured gas plant sites $681 $689 $598 $603 Other Superfund Sites 89 90 88 90 Total $770 $779 $686 $693 Regulatory assets $787 $810 $696 $716
Environmental Remediation Costs	Environmental remediation costs incurred related to Superfund Sites for the three and six months ended June 30, 2019 and 2018 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Remediation costs incurred $8 $6 $6 $5 For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Remediation costs incurred $11 $9 $8 $8
Accrued Liability for Asbestos Suits and Workers' Compensation Proceedings	The accrued liability for asbestos suits and workers’ compensation proceedings (including those related to asbestos exposure) and the amounts deferred as regulatory assets for the Companies at June 30, 2019 and December 31, 2018 were as follows: Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Accrued liability – asbestos suits $8 $8 $7 $7 Regulatory assets – asbestos suits $8 $8 $7 $7 Accrued liability – workers’ compensation $79 $79 $75 $75 Regulatory assets – workers’ compensation $4 $5 $4 $5

Other Material Contingencies (T

Other Material Contingencies (Tables)	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Summary of Total Guarantees	A summary, by type and term, of Con Edison’s total guarantees under these agreements at June 30, 2019 is as follows: Guarantee Type 0 – 3 years 4 – 10 years > 10 years Total (Millions of Dollars) Con Edison Transmission $535 $137 $— $672 Energy transactions 494 21 197 712 Renewable electric production projects 128 9 376 513 Other 70 — — 70 Total $1,227 $167 $573 $1,967

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Lease Costs, Cash Flows and Other Related Information	Operating lease cost and cash paid for amounts included in the measurement of lease liabilities for the three and six months ended June 30, 2019 were as follows: For the Three Months Ended June 30, 2019 (Millions of Dollars) Con Edison CECONY Operating lease cost $21 $16 Operating lease cash flows $9 $4 For the Six Months Ended June 30, 2019 (Millions of Dollars) Con Edison CECONY Operating lease cost $41 $32 Operating lease cash flows $17 $8 Other information related to leases for Con Edison and CECONY at June 30, 2019 was as follows: Con Edison CECONY Weighted Average Remaining Lease Term: Operating leases 19.1 years 14.5 years Finance leases 10.5 years 2.3 years Weighted Average Discount Rate: Operating leases 4.3% 3.6% Finance leases 4.0% 5.1%
Operating Leases, Future Minimum Lease Payments	Future minimum lease payments under non-cancellable leases at June 30, 2019 were as follows: (Millions of Dollars) Con Edison CECONY Year Ending June 30, Operating Leases Finance Leases Operating Leases Finance Leases 2020 $77 $1 $58 $1 2021 74 — 57 — 2022 70 — 54 — 2023 68 — 53 — 2024 68 — 53 — All years thereafter 970 1 551 — Total future minimum lease payments $1,327 $2 $826 $1 Less: imputed interest (451) — (185) — Total $876 $2 $641 $1 Reported as of June 30, 2019 Operating lease liabilities (current) $55 $— $46 $— Operating lease liabilities (noncurrent) 821 — 595 — Other current liabilities — 1 — 1 Other noncurrent liabilities — 1 — — Total $876 $2 $641 $1
Finance Leases, Future Minimum Lease Payments	Future minimum lease payments under non-cancellable leases at June 30, 2019 were as follows: (Millions of Dollars) Con Edison CECONY Year Ending June 30, Operating Leases Finance Leases Operating Leases Finance Leases 2020 $77 $1 $58 $1 2021 74 — 57 — 2022 70 — 54 — 2023 68 — 53 — 2024 68 — 53 — All years thereafter 970 1 551 — Total future minimum lease payments $1,327 $2 $826 $1 Less: imputed interest (451) — (185) — Total $876 $2 $641 $1 Reported as of June 30, 2019 Operating lease liabilities (current) $55 $— $46 $— Operating lease liabilities (noncurrent) 821 — 595 — Other current liabilities — 1 — 1 Other noncurrent liabilities — 1 — — Total $876 $2 $641 $1
Future Minimum Lease Commitments Accounted for Under Topic 840	The future minimum lease commitments at December 31, 2018, accounted for under Topic 840, for the Companies’ operating lease agreements that are not cancellable by the Companies were as follows: (Millions of Dollars) Con Edison CECONY 2019 $72 $56 2020 72 56 2021 71 54 2022 68 53 2023 68 53 All years thereafter 890 592 Total $1,241 $864

Income Tax (Tables)

Income Tax (Tables)	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Schedule of Income Tax Reconciliation	Reconciliation of the difference between income tax expense and the amount computed by applying the prevailing statutory income tax rate to income before income taxes for the six months ended June 30, 2019 and 2018 is as follows: Con Edison CECONY (% of Pre-tax income) 2019 2018 2019 2018 STATUTORY TAX RATE Federal 21 % 21 % 21 % 21 % Changes in computed taxes resulting from: State income tax 4 5 4 5 Cost of removal 1 1 1 1 Other plant-related items (1 ) (1 ) (1 ) (1 ) Renewable energy credits (2 ) (2 ) — — Amortization of excess deferred federal income taxes (5 ) (4 ) (4 ) (4 ) Effective tax rate 18 % 20 % 21 % 22 % Reconciliation of the difference between income tax expense and the amount computed by applying the prevailing statutory income tax rate to income before income taxes for the three months ended June 30, 2019 and 2018 is as follows: Con Edison CECONY (% of Pre-tax income) 2019 2018 2019 2018 STATUTORY TAX RATE Federal 21 % 21 % 21 % 21 % Changes in computed taxes resulting from: State income tax 3 5 3 4 Cost of removal 2 2 2 2 Other plant-related items (2 ) (1 ) (1 ) (1 ) Renewable energy credits (5 ) (3 ) — — Reserve for uncertain tax positions 2 — — — Amortization of excess deferred federal income taxes (10 ) (7 ) (9 ) (8 ) Other — — (1 ) (1 ) Effective tax rate 11 % 17 % 15 % 17 %

Financial Information by Busi_2

Financial Information by Business Segment (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Financial Data for Business Segments	The financial data for the business segments for the three and six months ended June 30, 2019 and 2018 were as follows: For the Three Months Ended June 30, Operating Inter-segment Depreciation and Operating (Millions of Dollars) 2019 2018 2019 2018 2019 2018 2019 2018 CECONY Electric $1,833 $1,807 $5 $4 $261 $243 $314 $318 Gas 408 435 2 2 56 51 94 82 Steam 90 96 16 18 22 22 (32) (18) Consolidation adjustments — — (23) (24) — — — — Total CECONY $2,331 $2,338 $— $— $339 $316 $376 $382 O&R Electric $138 $144 $— $— $15 $14 $16 $18 Gas 41 54 — — 6 5 (3) 5 Total O&R $179 $198 $— $— $21 $19 $13 $23 Clean Energy Businesses $233 $158 $— $— $58 $19 $72 $24 Con Edison Transmission 1 1 — — — — (2) (1) Other (a) — 1 — — — — (1) (2) Total Con Edison $2,744 $2,696 $— $— $418 $354 $458 $426 (a) Parent company and consolidation adjustments. Other does not represent a business segment. For the Six Months Ended June 30, Operating Inter-segment Depreciation and Operating (Millions of Dollars) 2019 2018 2019 2018 2019 2018 2019 2018 CECONY Electric $3,630 $3,536 $9 $8 $518 $483 $571 $571 Gas 1,330 1,276 3 4 111 100 438 404 Steam 411 410 35 37 44 43 92 112 Consolidation adjustments — — (47) (49) — — — — Total CECONY $5,371 $5,222 $— $— $673 $626 $1,101 $1,087 O&R Electric $283 $293 $— $— $30 $28 $31 $26 Gas 154 152 — — 12 10 36 42 Total O&R $437 $445 $— $— $42 $38 $67 $68 Clean Energy Businesses 450 391 — — 116 38 83 33 Con Edison Transmission 2 2 — — — — (3) (3) Other (a) (2 ) — — — — — (4) (5) Total Con Edison $6,258 $6,060 $— $— $831 $702 $1,244 $1,180 (a) Parent company and consolidation adjustments. Other does not represent a business segment.

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Offsetting of Liabilities	The fair values of the Companies’ derivatives including the offsetting of assets and liabilities on the consolidated balance sheet at June 30, 2019 and December 31, 2018 were: (Millions of Dollars) 2019 2018 Balance Sheet Location Gross Amounts of Recognized Assets/(Liabilities) Gross Amounts Offset Net Amounts of Assets/ (Liabilities) (a) Gross Amounts of Recognized Assets/(Liabilities) Gross Amounts Offset Net Amounts of Assets/ (Liabilities) (a) Con Edison Fair value of derivative assets Current $37 $(24) $13 (b) $43 $(14) $29 (b) Noncurrent 6 (6) — 16 (7) 9 (d) Total fair value of derivative assets $43 $(30) $13 $59 $(21) $38 Fair value of derivative liabilities Current $(97) $29 $(68) (c) $(61) $11 $(50) Noncurrent (152) 22 (130) (c) (25) 9 (16) (d) Total fair value of derivative liabilities $(249) $51 $(198) $(86) $20 $(66) Net fair value derivative assets/(liabilities) $(206) $21 $(185) $(27) $(1) $(28) CECONY Fair value of derivative assets Current $26 $(16) $10 (b) $25 $(6) $19 (b) Noncurrent 4 (4) — 11 (5) 6 Total fair value of derivative assets $30 $(20) $10 $36 $(11) $25 Fair value of derivative liabilities Current $(66) $25 $(41) $(31) $6 $(25) Noncurrent (106) 20 (86) (12) 6 (6) Total fair value of derivative liabilities $(172) $45 $(127) $(43) $12 $(31) Net fair value derivative assets/(liabilities) $(142) $25 $(117) $(7) $1 $(6) (a) Derivative instruments and collateral were offset on the consolidated balance sheet as applicable under the accounting rules. The Companies enter into master agreements for their commodity derivatives. These agreements typically provide offset in the event of contract termination. In such case, generally the non-defaulting party’s payable will be offset by the defaulting party’s payable. The non-defaulting party will customarily notify the defaulting party within a specific time period and come to an agreement on the early termination amount. (b) At June 30, 2019 and December 31, 2018 , margin deposits for Con Edison ( $6 million and $7 million , respectively) and CECONY ( $6 million and $6 million , respectively) were classified as derivative assets on the consolidated balance sheet, but not included in the table. Margin is collateral, typically cash, that the holder of a derivative instrument is required to deposit in order to transact on an exchange and to cover its potential losses with its broker or the exchange. (c) Includes amounts for interest rate swaps of $(5) million in current liabilities and $(32) million in noncurrent liabilities. At June 30, 2019 the Clean Energy Businesses had interest rate swaps with notional amounts of $829 million . The expiration dates of the swaps range from 2024-2041. (d) Includes amounts for interest rate swaps of $2 million in noncurrent assets and $(6) million in noncurrent liabilities. At December 31, 2018 the Clean Energy Business had interest rate swaps with notional amounts of $499 million . The expiration dates of the swaps range from 2024-2035.
Offsetting of Assets	The fair values of the Companies’ derivatives including the offsetting of assets and liabilities on the consolidated balance sheet at June 30, 2019 and December 31, 2018 were: (Millions of Dollars) 2019 2018 Balance Sheet Location Gross Amounts of Recognized Assets/(Liabilities) Gross Amounts Offset Net Amounts of Assets/ (Liabilities) (a) Gross Amounts of Recognized Assets/(Liabilities) Gross Amounts Offset Net Amounts of Assets/ (Liabilities) (a) Con Edison Fair value of derivative assets Current $37 $(24) $13 (b) $43 $(14) $29 (b) Noncurrent 6 (6) — 16 (7) 9 (d) Total fair value of derivative assets $43 $(30) $13 $59 $(21) $38 Fair value of derivative liabilities Current $(97) $29 $(68) (c) $(61) $11 $(50) Noncurrent (152) 22 (130) (c) (25) 9 (16) (d) Total fair value of derivative liabilities $(249) $51 $(198) $(86) $20 $(66) Net fair value derivative assets/(liabilities) $(206) $21 $(185) $(27) $(1) $(28) CECONY Fair value of derivative assets Current $26 $(16) $10 (b) $25 $(6) $19 (b) Noncurrent 4 (4) — 11 (5) 6 Total fair value of derivative assets $30 $(20) $10 $36 $(11) $25 Fair value of derivative liabilities Current $(66) $25 $(41) $(31) $6 $(25) Noncurrent (106) 20 (86) (12) 6 (6) Total fair value of derivative liabilities $(172) $45 $(127) $(43) $12 $(31) Net fair value derivative assets/(liabilities) $(142) $25 $(117) $(7) $1 $(6) (a) Derivative instruments and collateral were offset on the consolidated balance sheet as applicable under the accounting rules. The Companies enter into master agreements for their commodity derivatives. These agreements typically provide offset in the event of contract termination. In such case, generally the non-defaulting party’s payable will be offset by the defaulting party’s payable. The non-defaulting party will customarily notify the defaulting party within a specific time period and come to an agreement on the early termination amount. (b) At June 30, 2019 and December 31, 2018 , margin deposits for Con Edison ( $6 million and $7 million , respectively) and CECONY ( $6 million and $6 million , respectively) were classified as derivative assets on the consolidated balance sheet, but not included in the table. Margin is collateral, typically cash, that the holder of a derivative instrument is required to deposit in order to transact on an exchange and to cover its potential losses with its broker or the exchange. (c) Includes amounts for interest rate swaps of $(5) million in current liabilities and $(32) million in noncurrent liabilities. At June 30, 2019 the Clean Energy Businesses had interest rate swaps with notional amounts of $829 million . The expiration dates of the swaps range from 2024-2041. (d) Includes amounts for interest rate swaps of $2 million in noncurrent assets and $(6) million in noncurrent liabilities. At December 31, 2018 the Clean Energy Business had interest rate swaps with notional amounts of $499 million . The expiration dates of the swaps range from 2024-2035.
Realized and Unrealized Gains or Losses on Commodity Derivatives	The following table presents the realized and unrealized gains or losses on derivatives that have been deferred or recognized in earnings for the three and six months ended June 30, 2019 and 2018 : For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) Balance Sheet Location 2019 2018 2019 2018 Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: Current Deferred derivative gains $(16) $5 $(15) $6 Noncurrent Deferred derivative gains (2) 7 — 3 Total deferred gains/(losses) $(18) $12 $(15) $9 Current Deferred derivative losses $(36) $44 $(34) $42 Current Recoverable energy costs (41) (34) (37) (34) Noncurrent Deferred derivative losses (74) 59 (68) 56 Total deferred gains/(losses) $(151) $69 $(139) $64 Net deferred gains/(losses) $(169) $81 $(154) $73 Income Statement Location Pre-tax gains/(losses) recognized in income Purchased power expense $— $— $— $— Gas purchased for resale — (1) — — Non-utility revenue 7 (3) — — Other interest expense (24) — — — Total pre-tax gains/(losses) recognized in income $(17) $(4) $— $— For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) Balance Sheet Location 2019 2018 2019 2018 Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: Current Deferred derivative gains $(12) $(17) $(11) $(16) Noncurrent Deferred derivative gains (8) 5 (6) 3 Total deferred gains/(losses) $(20) $(12) $(17) $(13) Current Deferred derivative losses $(39) $(4) $(34) $(2) Current Recoverable energy costs (59) (9) (51) (8) Noncurrent Deferred derivative losses (100) 8 (95) 7 Total deferred gains/(losses) $(198) $(5) $(180) $(3) Net deferred gains/(losses) $(218) $(17) $(197) $(16) Income Statement Location Pre-tax gains/(losses) recognized in income Purchased power expense $— $— $— $— Gas purchased for resale (2) (1) — — Non-utility revenue 15 — — — Other operations and maintenance expense 1 — 1 — Other interest expense (34) — — — Total pre-tax gains/(losses) recognized in income $(20) ($1 ) $1 $—
Hedged Volume of Derivative Transactions	The following table presents the hedged volume of Con Edison’s and CECONY’s commodity derivative transactions at June 30, 2019 : Electric Energy (MWh) (a)(b) Capacity (MW) (a) Natural Gas (Dt) (a)(b) Refined Fuels (gallons) Con Edison 32,178,387 19,324 202,435,409 7,728,000 CECONY 29,476,875 8,550 187,910,000 7,728,000 (a) Volumes are reported net of long and short positions, except natural gas collars where the volumes of long positions are reported. (b) Excludes electric congestion and gas basis swap contracts, which are associated with electric and gas contracts and hedged volumes.
Aggregate Fair Value of Companies' Derivative Instruments with Credit-Risk-Related Contingent Features	The following table presents the aggregate fair value of the Companies’ derivative instruments with credit-risk-related contingent features that are in a net liability position, the collateral posted for such positions and the additional collateral that would have been required to be posted had the lowest applicable credit rating been reduced one level and to below investment grade at June 30, 2019 : (Millions of Dollars) Con Edison (a) CECONY (a) Aggregate fair value – net liabilities $159 $137 Collateral posted 34 27 Additional collateral (b) (downgrade one level from current ratings) 37 31 Additional collateral (b) (downgrade to below investment grade from current ratings) 140 (c) 118 (c) (a) Non-derivative transactions for the purchase and sale of electricity and gas and qualifying derivative instruments, which have been designated as normal purchases or normal sales, are excluded from the table. These transactions primarily include purchases of electricity from independent system operators. In the event the Utilities and the Clean Energy Businesses were no longer extended unsecured credit for such purchases, the Companies would be required to post an immaterial amount of additional collateral at June 30, 2019 . For certain other such non-derivative transactions, the Companies could be required to post collateral under certain circumstances, including in the event counterparties had reasonable grounds for insecurity. (b) The Companies measure the collateral requirements by taking into consideration the fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position plus amounts owed to counterparties for settled transactions and amounts required by counterparties for minimum financial security. The fair value amounts represent unrealized losses, net of any unrealized gains where the Companies have a legally enforceable right to offset. (c) Derivative instruments that are net assets have been excluded from the table. At June 30, 2019 , if Con Edison had been downgraded to below investment grade, it would have been required to post additional collateral for such derivative instruments of $15 million .

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on Recurring Basis	Assets and liabilities measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018 are summarized below. 2019 2018 (Millions of Dollars) Level 1 Level 2 Level 3 Netting Adjustment (e) Total Level 1 Level 2 Level 3 Netting Adjustment (e) Total Con Edison Derivative assets: Commodity (a)(b)(c) $3 $22 $2 $(8) $19 $6 $36 $7 $(6) $43 Interest rate swaps (a)(b)(c) — — — — — — 2 — — 2 Other (a)(b)(d) 321 118 — — 439 287 114 — — 401 Total assets $324 $140 $2 $(8) $458 $293 $152 $7 $(6) $446 Derivative liabilities: Commodity (a)(b)(c) $15 $135 $48 $(37) $161 $8 $43 $20 $(11) $60 Interest rate swaps (a)(b)(c) — 37 — — 37 — 6 — — 6 Total liabilities $15 $172 $48 $(37) $198 $8 $49 $20 $(11) $66 CECONY Derivative assets: Commodity (a)(b)(c) $2 $13 $1 $— $16 $3 $28 $1 $(1) $31 Other (a)(b)(d) 301 112 — — 413 267 109 — — 376 Total assets $303 $125 $1 $— $429 $270 $137 $1 $(1) $407 Derivative liabilities: Commodity (a)(b)(c) $13 $114 $31 $(31) $127 $5 $30 $3 $(6) $32 (a) The Companies’ policy is to review the fair value hierarchy and recognize transfers into and transfers out of the levels at the end of each reporting period. Con Edison and CECONY had no transfers between levels 1, 2, and 3 during the six months ended June 30, 2019 . Con Edison and CECONY had $2 million of commodity derivative liabilities transferred from level 3 to level 2 during the year ended December 31, 2018 because of availability of observable market data due to the decrease in the terms of certain contracts from beyond three years as of September 30, 2018 to less than three years as of December 31, 2018 . (b) Level 2 assets and liabilities include investments held in the deferred compensation plan and/or non-qualified retirement plans, exchange-traded contracts where there is insufficient market liquidity to warrant inclusion in Level 1, certain over-the-counter derivative instruments for electricity, refined products and natural gas. Derivative instruments classified as Level 2 are valued using industry standard models that incorporate corroborated observable inputs; such as pricing services or prices from similar instruments that trade in liquid markets, time value and volatility factors. (c) The accounting rules for fair value measurements and disclosures require consideration of the impact of nonperformance risk (including credit risk) from a market participant perspective in the measurement of the fair value of assets and liabilities. At June 30, 2019 and December 31, 2018 , the Companies determined that nonperformance risk would have no material impact on their financial position or results of operations. (d) Other assets are comprised of assets such as life insurance contracts within the deferred compensation plan and non-qualified retirement plans. (e) Amounts represent the impact of legally-enforceable master netting agreements that allow the Companies to net gain and loss positions and cash collateral held or placed with the same counterparties.
Schedule of Commodity Derivatives	Fair Value of Level 3 at June 30, 2019 Valuation Techniques Unobservable Inputs Range (Millions of Dollars) Con Edison – Commodity Electricity $(27) Discounted Cash Flow Forward energy prices (a) $20.00-$71.70 per MWh (16) Discounted Cash Flow Forward capacity prices (a) $0.70-$4.83 per kW-month Natural Gas (4) Discounted Cash Flow Forward natural gas prices (a) $1.45-$2.31 per Dt Transmission Congestion Contracts/Financial Transmission Rights 1 Discounted Cash Flow Inter-zonal forward price curves adjusted for historical zonal losses (b) $0.03-$4.29 per MWh Total Con Edison—Commodity $(46) CECONY – Commodity Electricity $(25) Discounted Cash Flow Forward energy prices (a) $21.70-$71.70 per MWh (6) Discounted Cash Flow Forward capacity prices (a) $0.70-$4.80 per kW-month Transmission Congestion Contracts 1 Discounted Cash Flow Inter-zonal forward price curves adjusted for historical zonal losses (b) $0.43-$3.13 per MWh Total CECONY—Commodity $(30) (a) Generally, increases/(decreases) in this input in isolation would result in a higher/(lower) fair value measurement. (b) Generally, increases/(decreases) in this input in isolation would result in a lower/(higher) fair value measurement.
Reconciliation of Beginning and Ending Net Balances for Assets and Liabilities Measured at Level 3 Fair Value	The table listed below provides a reconciliation of the beginning and ending net balances for assets and liabilities measured at fair value as of June 30, 2019 and 2018 and classified as Level 3 in the fair value hierarchy: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Beginning balance as of April 1, $(19) $3 $(5) $2 Included in earnings — (3) 1 1 Included in regulatory assets and liabilities (27) (1) (25) (2) Settlements — (3) (1) (1) Ending balance as of June 30, $(46) $(4) $(30) $— For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2019 2018 2019 2018 Beginning balance as of January 1, $(13) $1 $(2) $4 Included in earnings (4) 1 1 3 Included in regulatory assets and liabilities (31) (1) (28) (5) Settlements 2 (6) (1) (3) Transfer out of level 3 — 1 — 1 Ending balance as of June 30, $(46) $(4) $(30) $—

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2019
Equity Method Investments and Joint Ventures [Abstract]
Summary of VIEs	At June 30, 2019 and December 31, 2018 , Con Edison’s consolidated balance sheet included the following amounts associated with its VIEs: Tax Equity Projects Great Valley Solar Copper Mountain - Mesquite Solar Texas Solar 4 (Millions of Dollars) 2019 2018 2019 2018 2019 2018 Restricted cash $— $— $— $— $7 $4 Non-utility property, less accumulated depreciation (g)(h) 309 313 488 492 96 98 Other assets 39 18 109 97 10 9 Total assets (a) $348 $331 $597 $589 $113 $111 Long-term debt due within one year $— $— $— $— $57 $2 Other liabilities 32 17 43 33 28 26 Long-term debt — — — — — 56 Total liabilities (b) $32 $17 $43 $33 $85 $84 (a) The assets of the Tax Equity Projects and Texas Solar 4 represent assets of a consolidated VIE that can be used only to settle obligations of the consolidated VIE. (b) The liabilities of the Tax Equity Projects and Texas Solar 4 represent liabilities of a consolidated VIE for which creditors do not have recourse to the general credit of the primary beneficiary. (c) Con Edison did not provide any financial or other support during the year that was not previously contractually required. (d) Great Valley Solar consists of the Great Valley Solar 1, Great Valley Solar 2, Great Valley Solar 3 and Great Valley Solar 4 projects, for which the noncontrolling interest of the tax equity investor was $48 million and $33 million at June 30, 2019 and December 31, 2018, respectively. (e) Copper Mountain - Mesquite Solar consists of the Copper Mountain Solar 4, Mesquite Solar 2 and Mesquite Solar 3 projects for which the noncontrolling interest of the tax equity investor was $99 million and $71 million at June 30, 2019 and December 31, 2018 , respectively. (f) Noncontrolling interest of the third party was $7 million at June 30, 2019 and December 31, 2018 . (g) Non-utility property is reduced by accumulated depreciation of $5 million for Great Valley Solar, $8 million for Copper Mountain - Mesquite Solar and $17 million for Texas Solar 4 at June 30, 2019 . (h) Non-utility property is reduced by accumulated depreciation of $1 million for Great Valley Solar, $1 million for Copper Mountain - Mesquite Solar and $15 million for Texas Solar 4 at December 31, 2018.

General (Details)

General (Details)	6 Months Ended
	Jun. 30, 2019subsidiaryregistrant
Accounting Policies [Abstract]
Number of registrants | registrant	2
Number of regulated utility subsidiaries	2
Clean Energy Businesses
Investment [Line Items]
Number of subsidiaries	3

Summary of Significant Accoun_4

Summary of Significant Accounting Policies and Other Matters - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 2,604	$ 2,582	$ 5,932	$ 5,819
Total revenues	2,744	2,696	6,258	6,060
Other
Disaggregation of Revenue [Line Items]
Total revenues	140	114	326	241
Clean Energy Businesses | Renewables | Engineering, procurement and construction
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	4	9	6	97
CECONY
Disaggregation of Revenue [Line Items]
Total revenues	2,331	2,338	5,371	5,222
Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	2,744	2,696	6,258	6,060
Operating Segments | Clean Energy Businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	187	96	317	246
Total revenues	233	158	450	391
Operating Segments | Clean Energy Businesses | Other
Disaggregation of Revenue [Line Items]
Total revenues	46	62	133	145
Operating Segments | Clean Energy Businesses | Renewables
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	171	73	278	205
Total revenues	171	73	278	205
Operating Segments | Clean Energy Businesses | Renewables | Other
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Clean Energy Businesses | Energy services
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	16	23	39	41
Total revenues	16	23	39	41
Operating Segments | Clean Energy Businesses | Energy services | Other
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Clean Energy Businesses | Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Total revenues	46	62	133	145
Operating Segments | Clean Energy Businesses | Other | Other
Disaggregation of Revenue [Line Items]
Total revenues	46	62	133	145
Operating Segments | Con Edison Transmission
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1	1	2	2
Total revenues	1	1	2	2
Operating Segments | Con Edison Transmission | Other
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | CECONY
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,237	2,292	5,177	5,130
Total revenues	2,331	2,338	5,371	5,222
Operating Segments | CECONY | Other
Disaggregation of Revenue [Line Items]
Total revenues	94	46	194	92
Operating Segments | CECONY | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,751	1,771	3,465	3,474
Total revenues	1,833	1,807	3,630	3,536
Operating Segments | CECONY | Electric | Other
Disaggregation of Revenue [Line Items]
Total revenues	82	36	165	62
Operating Segments | CECONY | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	400	428	1,310	1,252
Total revenues	408	435	1,330	1,276
Operating Segments | CECONY | Gas | Other
Disaggregation of Revenue [Line Items]
Total revenues	8	7	20	24
Operating Segments | CECONY | Steam
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	86	93	402	404
Total revenues	90	96	411	410
Operating Segments | CECONY | Steam | Other
Disaggregation of Revenue [Line Items]
Total revenues	4	3	9	6
Operating Segments | O&R
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	179	193	436	441
Total revenues	179	198	437	445
Operating Segments | O&R | Other
Disaggregation of Revenue [Line Items]
Total revenues	0	5	1	4
Operating Segments | O&R | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	140	146	283	293
Total revenues	138	144	283	293
Operating Segments | O&R | Electric | Other
Disaggregation of Revenue [Line Items]
Total revenues	(2)	(2)	0	0
Operating Segments | O&R | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	39	47	153	148
Total revenues	41	54	154	152
Operating Segments | O&R | Gas | Other
Disaggregation of Revenue [Line Items]
Total revenues	2	7	1	4
Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Total revenues	0	1	(2)	0
Other | Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 1	$ (2)	$ 0

Summary of Significant Accoun_5

Summary of Significant Accounting Policies and Other Matters - Change in Unbilled Contract and Unearned Revenues (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Jan. 01, 2018
Unbilled contract revenue
Beginning balance	$ 29	$ 58
Additions	44	73
Subtractions	38	88
Ending balance	35	43
Unearned revenue
Beginning balance	20	87
Additions	0	31
Subtractions	2	105
Ending balance	$ 18	$ 13
Contracts with customer, revenue recognized, amount outstanding end of last period			$ 2	$ 50

Summary of Significant Accoun_6

Summary of Significant Accounting Policies and Other Matters - Revenue Recognition, Remaining Performance Obligation (Details) $ in Millions	Jun. 30, 2019USD ($)
Accounting Policies [Abstract]
Remaining performance obligation	$ 67
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Accounting Policies [Abstract]
Remaining performance obligation	$ 31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Accounting Policies [Abstract]
Remaining performance obligation	$ 36
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction

Summary of Significant Accoun_7

Summary of Significant Accounting Policies and Other Matters - Utility Plant (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ 79	$ 29
Software Licenses
Finite-Lived Intangible Assets [Line Items]
Gross asset	97	100
Estimated aggregate annual amortization expense	7
Accumulated amortization	7	3
CECONY | Software Licenses
Finite-Lived Intangible Assets [Line Items]
Gross asset	92	95
Estimated aggregate annual amortization expense	7
Accumulated amortization	$ 6	$ 3

Summary of Significant Accoun_8

Summary of Significant Accounting Policies and Other Matters - Long-Lived and Intangible Assets (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)MW	Dec. 31, 2018USD ($)
Finite-Lived Intangible Assets [Line Items]
Net non-utility plant	$ 42,745	$ 41,749
Intangible assets	1,605	$ 1,654
PG&E Project
Finite-Lived Intangible Assets [Line Items]
Net non-utility plant	853
Intangible assets	1,090
Long-term debt	1,032
PG&E Project | Secured Related to Project Debt
Finite-Lived Intangible Assets [Line Items]
Net non-utility plant	$ 288
Con Edison Development | PG&E Project
Finite-Lived Intangible Assets [Line Items]
Aggregate power to be sold (in MW) | MW	680

Summary of Significant Accoun_9

Summary of Significant Accounting Policies and Other Matters - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Net income for common stock	$ 152	$ 188	$ 576	$ 616
Weighted average common shares outstanding – basic (shares)	328.3	310.8	325.2	310.6
Add: Incremental shares attributable to effect of potentially dilutive securities (shares)	0.9	1.1	0.9	1.1
Adjusted weighted average common shares outstanding – diluted (shares)	329.2	311.9	326.1	311.7
Net income per common share - basic (dollars per share)	$ 0.46	$ 0.60	$ 1.77	$ 1.98
Net income per common share - diluted (dollars per share)	$ 0.46	$ 0.60	$ 1.77	$ 1.98

Summary of Significant Accou_10

Summary of Significant Accounting Policies and Other Matters - Changes in Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 17,501	$ 16,839	$ 15,661	$ 15,425	$ 16,839	$ 15,425
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	4	2	4	5	6
Ending Balance	17,865	17,501	15,655	15,661	17,865	15,655
Accumulated OCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(12)	(16)	(22)	(26)	(16)	(26)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	4	2	4
Ending Balance	(11)	(12)	(20)	(22)	(11)	(20)
Pension Plan Liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
OCI before reclassifications, net of tax of $(1) for Con Edison in 2019 and 2018					2	3
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2018	1		2		3	3
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1		2		5	6
OCI before reclassifications, tax					(1)	(1)
Amounts reclassified from accumulated OCI related to pension plan liabilities, tax			(1)		(1)	(1)
CECONY
AOCI Attributable to Parent, Net of Tax [Roll Forward]
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	0	0	1	0	0	1
CECONY | Accumulated OCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(5)	(5)	(6)	(6)	(5)	(6)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES			1
Ending Balance	(5)	$ (5)	(5)	$ (6)	(5)	(5)
CECONY | Pension Plan Liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
OCI before reclassifications, net of tax of $(1) for Con Edison in 2019 and 2018					0	0
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2018	0		1		0	1
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	$ 0		$ 1		$ 0	$ 1

Summary of Significant Accou_11

Summary of Significant Accounting Policies and Other Matters - Reconciliation of Cash, Temporary Investments and Restricted Cash (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Cash and temporary cash investments	$ 831	$ 895	$ 866
Restricted cash	139		55
Total cash, temporary cash investments and restricted cash	970	1,006	921	$ 844
CEB | Cash Collateral Held for Project Finance Agreements
Cash and Cash Equivalents [Line Items]
Restricted cash	138		54
CECONY
Cash and Cash Equivalents [Line Items]
Cash and temporary cash investments	786	818	829
Restricted cash	0		0
Total cash, temporary cash investments and restricted cash	786	$ 818	829	$ 730
RECO | Transition Bond
Cash and Cash Equivalents [Line Items]
Restricted cash	$ 1		$ 1

Regulatory Matters - Rate Plans

Regulatory Matters - Rate Plans (Details) - USD ($) $ in Millions	1 Months Ended				12 Months Ended
	Feb. 29, 2020	Jul. 31, 2019	Jun. 30, 2019	May 31, 2019	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CECONY | NYSPSC | Electric
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)			9.75%	8.30%
Common equity ratio (as a percent)			50.00%	47.30%
CECONY | NYSPSC | Electric | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount							$ 58
Increase (decrease) in requested rate					$ 7	$ 27	(15)
Amended rate increase (decrease), amount					270	379	470
CECONY | NYSPSC | Gas
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)			9.75%	8.30%
Common equity ratio (as a percent)			50.00%	47.30%
CECONY | NYSPSC | Gas | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount							83
Increase (decrease) in requested rate					5	(4)	(4)
Amended rate increase (decrease), amount					$ 160	134	206
O&R | NYSPSC | Electric | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						5.8	8	$ 13.4
O&R | NYSPSC | Gas | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						$ 0.7	$ 3.6	$ (7.5)
RECO | New Jersey Board of Public Utilities | Electric
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)				10.00%
Common equity ratio (as a percent)				49.93%
RECO | New Jersey Board of Public Utilities | Electric | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 19.9
Amended rate increase (decrease), amount	$ 20.4
Subsequent Event | RECO | New Jersey Board of Public Utilities | Electric
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)		10.00%
Common equity ratio (as a percent)		49.04%

Regulatory Matters - Other Regu

Regulatory Matters - Other Regulatory Matters (Details) customer in Thousands, $ in Millions	Jul. 13, 2019customer	Mar. 31, 2018customer	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Sep. 30, 2018USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Jun. 30, 2019USD ($)
Public Utilities, General Disclosures [Line Items]
Regulatory assets				$ 4,334	$ 4,370		$ 4,334				$ 4,370	$ 4,334
Revenues				(2,744)		$ (2,696)	(6,258)	$ (6,060)
Electric
Public Utilities, General Disclosures [Line Items]
Revenues				(1,971)		(1,951)	(3,912)	(3,828)
Gas
Public Utilities, General Disclosures [Line Items]
Revenues				(449)		(489)	(1,484)	(1,428)
Steam
Public Utilities, General Disclosures [Line Items]
Revenues				(90)		(96)	(411)	(410)
CECONY
Public Utilities, General Disclosures [Line Items]
Regulatory assets				3,976	3,987		3,976				$ 3,987	3,976
Revenues				(2,331)		(2,338)	(5,371)	(5,222)
CECONY | Electric
Public Utilities, General Disclosures [Line Items]
Revenues				(1,833)		(1,807)	(3,630)	(3,536)
CECONY | Gas
Public Utilities, General Disclosures [Line Items]
Revenues				(408)		(435)	(1,330)	(1,276)
CECONY | Steam
Public Utilities, General Disclosures [Line Items]
Revenues				(90)		$ (96)	(411)	$ (410)
CECONY | Electric | Subsequent Event | West Side of Manhattan
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service | customer	72
CECONY | Electric | Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service | customer		209
Restoration costs												134
Operation and maintenance expenses												15
Operation and maintenance expenses charged against a storm reserve												84
Capital expenditures				29			29					29
Removal costs												6
CECONY | Electric | Scenario, Forecast | Subsequent Event | West Side of Manhattan
Public Utilities, General Disclosures [Line Items]
Revenues			$ 5
O&R | Electric | Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service | customer		93
Restoration costs												43
RECO | Electric | Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service | customer		44
Restoration costs												17
NYSPSC | CECONY | Electric
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA					311
Impact in regulatory liability resulting from TCJA							2,489
NYSPSC | CECONY | Electric | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA										$ 259
NYSPSC | CECONY | Gas
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA					$ 90
Impact in regulatory liability resulting from TCJA							804
NYSPSC | CECONY | Gas | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA										113
NYSPSC | CECONY | Steam
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA									$ 15
Tax credit, amortization period											3 years
Impact in regulatory liability resulting from TCJA							185
NYSPSC | CECONY | Steam | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA										$ 25
NYSPSC | CECONY | MTA Subway Power Outage
Public Utilities, General Disclosures [Line Items]
Regulatory costs				273			273					273
Regulatory assets				241			241					241
NYSPSC | CECONY | MTA Subway Power Outage | Electric
Public Utilities, General Disclosures [Line Items]
Regulatory costs				$ 32			$ 32					$ 32

Regulatory Matters - Regulatory

Regulatory Matters - Regulatory Assets (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	$ 4,237	$ 4,294
Regulatory assets – current	97	76
Total Regulatory Assets	4,334	4,370
Unrecognized pension and other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	2,042	2,238
Environmental remediation costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	787	810
Revenue taxes
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	304	291
MTA power reliability deferral
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	241	229
Property tax reconciliation
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	127	101
Deferred derivative losses
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	117	17
Municipal infrastructure support costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	76	67
Pension and other postretirement benefits deferrals
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	73	73
Deferred storm costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	72	76
System peak reduction and energy efficiency programs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	48	72
Meadowlands heater odorization project
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	35	36
Brooklyn Queens demand management program
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	34	39
Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	32	36
Preferred stock redemption
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	23	23
Recoverable REV demonstration project costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	20	20
Gate station upgrade project
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	17	17
Workers’ compensation
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	4	5
O&R transition bond charges
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	1	2
Indian Point Energy Center program costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	0	13
Other
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	184	129
Deferred derivative losses
Regulatory Assets [Line Items]
Regulatory assets – current	75	36
Recoverable energy costs
Regulatory Assets [Line Items]
Regulatory assets – current	22	40
CECONY
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	3,894	3,923
Regulatory assets – current	82	64
Total Regulatory Assets	3,976	3,987
CECONY | Unrecognized pension and other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	1,934	2,111
CECONY | Environmental remediation costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	696	716
CECONY | Revenue taxes
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	291	278
CECONY | MTA power reliability deferral
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	241	229
CECONY | Property tax reconciliation
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	115	86
CECONY | Deferred derivative losses
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	106	11
CECONY | Municipal infrastructure support costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	76	67
CECONY | Pension and other postretirement benefits deferrals
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	54	56
CECONY | Deferred storm costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	0	0
CECONY | System peak reduction and energy efficiency programs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	47	70
CECONY | Meadowlands heater odorization project
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	35	36
CECONY | Brooklyn Queens demand management program
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	34	39
CECONY | Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	30	34
CECONY | Preferred stock redemption
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	23	23
CECONY | Recoverable REV demonstration project costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	18	18
CECONY | Gate station upgrade project
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	17	17
CECONY | Workers’ compensation
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	4	5
CECONY | O&R transition bond charges
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	0	0
CECONY | Indian Point Energy Center program costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	0	13
CECONY | Other
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	173	114
CECONY | Deferred derivative losses
Regulatory Assets [Line Items]
Regulatory assets – current	63	29
CECONY | Recoverable energy costs
Regulatory Assets [Line Items]
Regulatory assets – current	$ 19	$ 35

Regulatory Matters - Regulato_2

Regulatory Matters - Regulatory Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	$ 4,604	$ 4,641
Regulatory liabilities – current	104	114
Total Regulatory Liabilities	4,708	4,755
Future income tax
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	2,470	2,515
Allowance for cost of removal less salvage
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	947	928
TCJA net benefits
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	449	434
Net unbilled revenue deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	155	117
Energy efficiency portfolio standard unencumbered funds
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	124	127
Pension and other postretirement benefit deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	63	62
Net proceeds from sale of property
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	45	6
Property tax refunds
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	45	45
System benefit charge carrying charge
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	37	27
Earnings sharing - electric, gas and steam
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	25	36
Settlement of prudence proceeding
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	22	37
BQDM and REV Demo reconciliations
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	22	18
Settlement of gas proceedings
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	12	15
Carrying charges on repair allowance and bonus depreciation
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	10	21
New York State income tax rate change
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	8	17
Unrecognized other postretirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	8	7
Base rate change deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	4	10
Property tax reconciliation
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	2	36
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	156	183
Refundable energy costs
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	50	31
Revenue decoupling mechanism
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	36	53
Deferred derivative gains
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	18	30
CECONY
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	4,214	4,258
Regulatory liabilities – current	61	73
Total Regulatory Liabilities	4,275	4,331
CECONY | Future income tax
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	2,323	2,363
CECONY | Allowance for cost of removal less salvage
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	805	790
CECONY | TCJA net benefits
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	429	411
CECONY | Net unbilled revenue deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	155	117
CECONY | Energy efficiency portfolio standard unencumbered funds
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	119	122
CECONY | Pension and other postretirement benefit deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	39	40
CECONY | Net proceeds from sale of property
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	45	6
CECONY | Property tax refunds
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	45	45
CECONY | System benefit charge carrying charge
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	33	24
CECONY | Earnings sharing - electric, gas and steam
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	17	27
CECONY | Settlement of prudence proceeding
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	22	37
CECONY | BQDM and REV Demo reconciliations
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	22	18
CECONY | Settlement of gas proceedings
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	12	15
CECONY | Carrying charges on repair allowance and bonus depreciation
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	9	21
CECONY | New York State income tax rate change
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	8	17
CECONY | Unrecognized other postretirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	3	7
CECONY | Base rate change deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	4	10
CECONY | Property tax reconciliation
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	2	36
CECONY | Other
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	122	152
CECONY | Refundable energy costs
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	22	8
CECONY | Revenue decoupling mechanism
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	22	36
CECONY | Deferred derivative gains
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	$ 17	$ 29

Capitalization - Additional Inf

Capitalization - Additional Information (Details) - USD ($)	1 Months Ended					3 Months Ended
	Jun. 30, 2019	May 31, 2019	Apr. 30, 2019	Mar. 31, 2019	Feb. 28, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Schedule of Capitalization [Line Items]
Number of shares of common stock issued (shares)				5,649,369
Value of common stock issued				$ 425,000,000		$ 400,000,000	$ 425,000,000
Term loan	$ 0					0		$ 825,000,000
PG&E Project
Schedule of Capitalization [Line Items]
Term loan	1,032,000,000					$ 1,032,000,000
Clean Energy Businesses
Schedule of Capitalization [Line Items]
Non-recourse debt								2,076,000,000
Clean Energy Businesses | Long-term debt due within one year
Schedule of Capitalization [Line Items]
Non-recourse debt								1,965,000,000
Clean Energy Businesses | Long-term debt
Schedule of Capitalization [Line Items]
Non-recourse debt								$ 111,000,000
Term Loan
Schedule of Capitalization [Line Items]
Face amount of debt					$ 825,000,000
Debt term					2 years
Repayment of debt	$ 150,000,000
Debentures | 4.125% Debentures Due 2049 | CECONY
Schedule of Capitalization [Line Items]
Face amount of debt		$ 700,000,000
Interest rate		4.125%
Debentures | 6.65% 10-Year Debentures | CECONY
Schedule of Capitalization [Line Items]
Debt term			10 years
Repayment of debt			$ 475,000,000
Interest rate			6.65%
Transition Bond | O&R
Schedule of Capitalization [Line Items]
Repayment of debt		$ 1,000,000
Secured Debt | Term Loan Due 2026 | Con Edison Development
Schedule of Capitalization [Line Items]
Borrowings		$ 464,000,000
Common Stock
Schedule of Capitalization [Line Items]
Number of shares of common stock issued (shares)						5,000,000	6,000,000
Value of common stock issued						$ 1,000,000
Forward Contracts
Schedule of Capitalization [Line Items]
Common stock reserved for issuance (shares)	1,050,000	5,800,000				1,050,000
Share price (dollars per share)		$ 84.83
Forward Contracts | Common Stock
Schedule of Capitalization [Line Items]
Number of shares of common stock issued (shares)	4,750,000
Value of common stock issued	$ 400,000,000

Capitalization - Carrying Amoun

Capitalization - Carrying Amounts and Fair Values of Long-Term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Unamortized debt expense	$ 192	$ 185
Carrying Amount
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	19,468	18,145
Fair Value
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	21,626	18,740
CECONY
Debt Instrument [Line Items]
Unamortized debt discount	142	139
CECONY | Carrying Amount
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	14,373	14,151
CECONY | Fair Value
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	$ 16,330	$ 14,685

Short-Term Borrowing (Details)

Short-Term Borrowing (Details) - USD ($)	Jun. 30, 2019	Apr. 30, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Commercial paper, outstanding	$ 1,161,000,000		$ 1,741,000,000
Loans outstanding under the credit agreement	$ 0		$ 0
Revolving Credit
Short-term Debt [Line Items]
Aggregate commitment		$ 2,200,000,000
Commercial Paper
Short-term Debt [Line Items]
Weighted average interest rate	2.60%		3.00%
CECONY
Short-term Debt [Line Items]
Commercial paper, outstanding	$ 849,000,000		$ 1,192,000,000
CECONY | Commercial Paper
Short-term Debt [Line Items]
Weighted average interest rate	0.00%		3.00%

Pension Benefits - Total Period

Pension Benefits - Total Periodic Benefit Costs (Details) - Pension Benefits - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost – including administrative expenses	$ 62	$ 72	$ 125	$ 145
Interest cost on projected benefit obligation	150	140	301	280
Expected return on plan assets	(247)	(258)	(494)	(516)
Recognition of net actuarial loss	130	172	259	344
Recognition of prior service cost/(credit)	(4)	(4)	(9)	(9)
TOTAL PERIODIC BENEFIT COST	91	122	182	244
Cost capitalized	(29)	(31)	(55)	(62)
Reconciliation to rate level	(2)	(23)	(7)	(46)
Total expense/(credit) recognized	60	68	120	136
CECONY
Defined Benefit Plan Disclosure [Line Items]
Service cost – including administrative expenses	58	68	117	136
Interest cost on projected benefit obligation	141	131	282	263
Expected return on plan assets	(234)	(245)	(468)	(490)
Recognition of net actuarial loss	123	163	246	326
Recognition of prior service cost/(credit)	(5)	(5)	(10)	(10)
TOTAL PERIODIC BENEFIT COST	83	112	167	225
Cost capitalized	(27)	(29)	(52)	(59)
Reconciliation to rate level	(1)	(25)	(6)	(50)
Total expense/(credit) recognized	$ 55	$ 58	$ 109	$ 116

Pension Benefits - Additional I

Pension Benefits - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
CECONY | Nonqualified Supplemental Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions	$ 15
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions	350
Contributions	78
Pension Benefits | CECONY
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions	318
Contributions	$ 77

Other Postretirement Benefits -

Other Postretirement Benefits - Periodic Postretirement Benefit Costs (Details) - Other Postretirement Benefits - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 5	$ 9	$ 10
Interest cost on accumulated other postretirement benefit obligation	11	11	22	21
Expected return on plan assets	(16)	(18)	(33)	(37)
Recognition of net actuarial loss/(gain)	(2)	2	(4)	4
Recognition of prior service cost/(credit)	(1)	(2)	(2)	(3)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT)	(4)	(2)	(8)	(5)
Cost capitalized	(2)	(2)	(4)	(4)
Reconciliation to rate level	3	2	7	5
Total expense/(credit) recognized	(3)	(2)	(5)	(4)
CECONY
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	6	7
Interest cost on accumulated other postretirement benefit obligation	9	9	18	17
Expected return on plan assets	(14)	(16)	(27)	(31)
Recognition of net actuarial loss/(gain)	(2)	1	(5)	1
Recognition of prior service cost/(credit)	0	(1)	(1)	(1)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT)	(4)	(4)	(9)	(7)
Cost capitalized	(2)	(1)	(3)	(3)
Reconciliation to rate level	2	2	4	5
Total expense/(credit) recognized	$ (4)	$ (3)	$ (8)	$ (5)

Other Postretirement Benefits_2

Other Postretirement Benefits - Additional Information (Details) - Other Postretirement Benefits $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Defined Benefit Plan Disclosure [Line Items]
Contributions	$ 10
CECONY
Defined Benefit Plan Disclosure [Line Items]
Contributions	$ 7

Environmental Matters - Accrued

Environmental Matters - Accrued Liabilities and Regulatory Assets (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Site Contingency [Line Items]
Accrued liabilities	$ 770	$ 779
Regulatory assets	4,334	4,370
Manufactured gas plant sites
Site Contingency [Line Items]
Accrued liabilities	681	689
Other Superfund Sites
Site Contingency [Line Items]
Accrued liabilities	89	90
Superfund Sites
Site Contingency [Line Items]
Accrued liabilities	770	779
Regulatory assets	787	810
CECONY
Site Contingency [Line Items]
Accrued liabilities	686	693
Regulatory assets	3,976	3,987
CECONY | Manufactured gas plant sites
Site Contingency [Line Items]
Accrued liabilities	598	603
CECONY | Other Superfund Sites
Site Contingency [Line Items]
Accrued liabilities	88	90
CECONY | Superfund Sites
Site Contingency [Line Items]
Accrued liabilities	686	693
Regulatory assets	$ 696	$ 716

Environmental Matters - Environ

Environmental Matters - Environmental Remediation Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Environmental Exit Cost [Line Items]
Remediation costs incurred	$ 8	$ 6	$ 11	$ 9
CECONY
Environmental Exit Cost [Line Items]
Remediation costs incurred	$ 6	$ 5	$ 8	$ 8

Environmental Matters - Additio

Environmental Matters - Additional Information (Details) - USD ($) $ in Billions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
CECONY | Asbestos Proceedings
Site Contingency [Line Items]
Estimated undiscounted asbestos liability (years)	15 years
Superfund Sites | Manufactured Gas Plant Sites | Maximum
Site Contingency [Line Items]
Estimated aggregate undiscounted potential liability related environmental contaminants (up to)		$ 2.8
Superfund Sites | Manufactured Gas Plant Sites | Maximum | CECONY
Site Contingency [Line Items]
Estimated aggregate undiscounted potential liability related environmental contaminants (up to)		$ 2.6

Environmental Matters - Accru_2

Environmental Matters - Accrued Liability (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Site Contingency [Line Items]
Regulatory assets	$ 4,334	$ 4,370
Asbestos Suits
Site Contingency [Line Items]
Accrued liability	8	8
Regulatory assets	8	8
Workers’ Compensation
Site Contingency [Line Items]
Accrued liability	79	79
Regulatory assets	4	5
CECONY
Site Contingency [Line Items]
Regulatory assets	3,976	3,987
CECONY | Asbestos Suits
Site Contingency [Line Items]
Accrued liability	7	7
Regulatory assets	7	7
CECONY | Workers’ Compensation
Site Contingency [Line Items]
Accrued liability	75	75
Regulatory assets	$ 4	$ 5

Other Material Contingencies -

Other Material Contingencies - Manhattan Explosion and Fire (Details) $ in Millions	Mar. 12, 2014buildingpeople	Feb. 28, 2017USD ($)	Jun. 30, 2019USD ($)lawsuit	Dec. 31, 2018USD ($)
Loss Contingencies [Line Items]
Accrued regulatory liability			$ 4,604	$ 4,641
Settlement of Gas Proceedings
Loss Contingencies [Line Items]
Accrued regulatory liability			$ 12	$ 15
Manhattan Explosion and Fire
Loss Contingencies [Line Items]
Number of buildings destroyed by fire | building	2
Number of people died in explosion and fire incident | people	8
Number of people injured in explosion and fire incident (more than) | people	50
Amount of costs that will not recover from customers		$ 126
Number of pending lawsuits | lawsuit			80
Manhattan Explosion and Fire | Settlement of Gas Proceedings
Loss Contingencies [Line Items]
Accrued regulatory liability		$ 27

Other Material Contingencies _2

Other Material Contingencies - Manhattan Steam Main Rupture (Details) $ in Millions	Jun. 30, 2019USD ($)
Property Damage, Clean Up and Other Response Costs Related with Manhattan Steam Main Rupture
Loss Contingencies [Line Items]
Loss contingency	$ 16
Capital, Retirement and Other Costs Related with Manhattan Steam Main Rupture
Loss Contingencies [Line Items]
Loss contingency	$ 10

Other Material Contingencies _3

Other Material Contingencies - Guarantees (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Guarantor Obligations [Line Items]
Total guarantees, by type and term	$ 1,967	$ 2,439
Con Edison Transmission
Guarantor Obligations [Line Items]
Total guarantees, by type and term	672
Energy transactions
Guarantor Obligations [Line Items]
Total guarantees, by type and term	712
Renewable electric production projects
Guarantor Obligations [Line Items]
Total guarantees, by type and term	513
Other
Guarantor Obligations [Line Items]
Total guarantees, by type and term	70
0 – 3 years
Guarantor Obligations [Line Items]
Total guarantees, by type and term	1,227
0 – 3 years | Con Edison Transmission
Guarantor Obligations [Line Items]
Total guarantees, by type and term	535
0 – 3 years | Energy transactions
Guarantor Obligations [Line Items]
Total guarantees, by type and term	494
0 – 3 years | Renewable electric production projects
Guarantor Obligations [Line Items]
Total guarantees, by type and term	128
0 – 3 years | Other
Guarantor Obligations [Line Items]
Total guarantees, by type and term	70
4 – 10 years
Guarantor Obligations [Line Items]
Total guarantees, by type and term	167
4 – 10 years | Con Edison Transmission
Guarantor Obligations [Line Items]
Total guarantees, by type and term	137
4 – 10 years | Energy transactions
Guarantor Obligations [Line Items]
Total guarantees, by type and term	21
4 – 10 years | Renewable electric production projects
Guarantor Obligations [Line Items]
Total guarantees, by type and term	9
4 – 10 years | Other
Guarantor Obligations [Line Items]
Total guarantees, by type and term	0
Greater than 10 years
Guarantor Obligations [Line Items]
Total guarantees, by type and term	573
Greater than 10 years | Con Edison Transmission
Guarantor Obligations [Line Items]
Total guarantees, by type and term	0
Greater than 10 years | Energy transactions
Guarantor Obligations [Line Items]
Total guarantees, by type and term	197
Greater than 10 years | Renewable electric production projects
Guarantor Obligations [Line Items]
Total guarantees, by type and term	376
Greater than 10 years | Other
Guarantor Obligations [Line Items]
Total guarantees, by type and term	$ 0

Other Material Contingencies _4

Other Material Contingencies - Con Edison Transmission (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2014
Guarantor Obligations [Line Items]
Guarantee obligations maximum exposure	$ 1,967	$ 2,439
Payment Guarantee by CET Electric of Contributions to New York Transco LLC
Guarantor Obligations [Line Items]
Ownership interest, percentage			45.70%
Estimated project cost percentage	175.00%
Financial Guarantee in Behalf of CET Gas for Proposed Gas Transmission Project
Guarantor Obligations [Line Items]
Guarantee obligations maximum exposure	$ 124

Other Material Contingencies _5

Other Material Contingencies - Other (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Guarantor Obligations [Line Items]
Guarantee obligations maximum exposure	$ 1,967	$ 2,439
Financial Guarantee for Indemnity Agreements for Surety Bonds
Guarantor Obligations [Line Items]
Guarantee obligations maximum exposure	$ 70

Leases - Additional Information

Leases - Additional Information (Details) $ in Millions	Jun. 30, 2019USD ($)
Lessee, Lease, Description [Line Items]
Assets under finance leases	$ 2
Finance leases, accumulated amortization	5
CECONY
Lessee, Lease, Description [Line Items]
Assets under finance leases	1
Finance leases, accumulated amortization	$ 3
Minimum
Lessee, Lease, Description [Line Items]
Lease, term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease, term	35 years
Lease, renewal term	5 years

Leases - Lease Cost and Cash Fl

Leases - Lease Cost and Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 21	$ 41
Operating lease cash flows	9	17
CECONY
Lessee, Lease, Description [Line Items]
Operating lease cost	16	32
Operating lease cash flows	$ 4	$ 8

Leases - Other Related Informat

Leases - Other Related Information (Details)	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term, Operating leases	19 years 1 month 6 days
Weighted Average Remaining Lease Term, Finance leases	10 years 6 months
Weighted Average Discount Rate, Operating leases	4.30%
Weighted Average Discount Rate, Finance leases	4.00%
CECONY
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term, Operating leases	14 years 6 months
Weighted Average Remaining Lease Term, Finance leases	2 years 3 months 18 days
Weighted Average Discount Rate, Operating leases	3.60%
Weighted Average Discount Rate, Finance leases	5.10%

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments (Details) $ in Millions	Jun. 30, 2019USD ($)
Operating Leases
2020	$ 77
2021	74
2022	70
2023	68
2024	68
All years thereafter	970
Total future minimum lease payments	1,327
Less: imputed interest	(451)
Total	876
Operating lease liabilities (current)	55
Operating lease liabilities (noncurrent)	821
Total	876
Finance Leases
2020	1
2021	0
2022	0
2023	0
2024	0
All years thereafter	1
Total future minimum lease payments	2
Less: imputed interest	0
Total	2
Other current liabilities	1
Other noncurrent liabilities	1
Total	2
CECONY
Operating Leases
2020	58
2021	57
2022	54
2023	53
2024	53
All years thereafter	551
Total future minimum lease payments	826
Less: imputed interest	(185)
Total	641
Operating lease liabilities (current)	46
Operating lease liabilities (noncurrent)	595
Total	641
Finance Leases
2020	1
2021	0
2022	0
2023	0
2024	0
All years thereafter	0
Total future minimum lease payments	1
Less: imputed interest	0
Total	1
Other current liabilities	1
Other noncurrent liabilities	0
Total	$ 1

Leases - Future Minimum Lease C

Leases - Future Minimum Lease Commitments Under Topic 840 (Details) $ in Millions	Dec. 31, 2018USD ($)
Operating Leased Assets [Line Items]
2019	$ 72
2020	72
2021	71
2022	68
2023	68
All years thereafter	890
Total	1,241
CECONY
Operating Leased Assets [Line Items]
2019	56
2020	56
2021	54
2022	53
2023	53
All years thereafter	592
Total	$ 864

Income Tax - Additional Informa

Income Tax - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Taxes Disclosure [Line Items]
Income tax expense	$ 19	$ 38	$ 127	$ 156
Estimated liability for uncertain tax positions	8		8
Effective income tax rate reconciliation, uncertainty of taxes			3
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate	8		8
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate, net of federal taxes	7		7
CECONY
Income Taxes Disclosure [Line Items]
Income tax expense	27	$ 31	151	$ 150
Estimated liability for uncertain tax positions	$ 5		5
Effective income tax rate reconciliation, uncertainty of taxes			$ 2

Income Tax - Income Tax Reconci

Income Tax - Income Tax Reconciliation (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
STATUTORY TAX RATE
Federal	21.00%	21.00%	21.00%	21.00%
Changes in computed taxes resulting from:
State income tax	3.00%	5.00%	4.00%	5.00%
Cost of removal	2.00%	2.00%	1.00%	1.00%
Other plant-related items	(2.00%)	(1.00%)	(1.00%)	(1.00%)
Renewable energy credits	(5.00%)	(3.00%)	(2.00%)	(2.00%)
Reserve for uncertain tax positions	2.00%	0.00%
Amortization of excess deferred federal income taxes	(10.00%)	(7.00%)	(5.00%)	(4.00%)
Other	0.00%	0.00%
Effective tax rate	11.00%	17.00%	18.00%	20.00%
CECONY
STATUTORY TAX RATE
Federal	21.00%	21.00%	21.00%	21.00%
Changes in computed taxes resulting from:
State income tax	3.00%	4.00%	4.00%	5.00%
Cost of removal	2.00%	2.00%	1.00%	1.00%
Other plant-related items	(1.00%)	(1.00%)	(1.00%)	(1.00%)
Renewable energy credits	0.00%	0.00%	0.00%	0.00%
Reserve for uncertain tax positions	0.00%	0.00%
Amortization of excess deferred federal income taxes	(9.00%)	(8.00%)	(4.00%)	(4.00%)
Other	(1.00%)	(1.00%)
Effective tax rate	15.00%	17.00%	21.00%	22.00%

Financial Information by Busi_3

Financial Information by Business Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Total revenues	$ 2,744	$ 2,696	$ 6,258	$ 6,060
Depreciation and amortization	418	354	831	702
Operating income/(loss)	458	426	1,244	1,180
Clean Energy Businesses
Segment Reporting Information [Line Items]
Depreciation and amortization	58	19	116	38
Operating income/(loss)	72	24	83	33
Con Edison Transmission
Segment Reporting Information [Line Items]
Operating income/(loss)	(2)	(1)	(3)	(3)
CECONY
Segment Reporting Information [Line Items]
Total revenues	2,331	2,338	5,371	5,222
Depreciation and amortization	339	316	673	626
Operating income/(loss)	376	382	1,101	1,087
CECONY | Electric
Segment Reporting Information [Line Items]
Depreciation and amortization	261	243	518	483
Operating income/(loss)	314	318	571	571
CECONY | Gas
Segment Reporting Information [Line Items]
Depreciation and amortization	56	51	111	100
Operating income/(loss)	94	82	438	404
CECONY | Steam
Segment Reporting Information [Line Items]
Depreciation and amortization	22	22	44	43
Operating income/(loss)	(32)	(18)	92	112
O&R
Segment Reporting Information [Line Items]
Depreciation and amortization	21	19	42	38
Operating income/(loss)	13	23	67	68
O&R | Electric
Segment Reporting Information [Line Items]
Depreciation and amortization	15	14	30	28
Operating income/(loss)	16	18	31	26
O&R | Gas
Segment Reporting Information [Line Items]
Depreciation and amortization	6	5	12	10
Operating income/(loss)	(3)	5	36	42
Operating segment
Segment Reporting Information [Line Items]
Total revenues	2,744	2,696	6,258	6,060
Operating segment | Clean Energy Businesses
Segment Reporting Information [Line Items]
Total revenues	233	158	450	391
Operating segment | Con Edison Transmission
Segment Reporting Information [Line Items]
Total revenues	1	1	2	2
Operating segment | CECONY
Segment Reporting Information [Line Items]
Total revenues	2,331	2,338	5,371	5,222
Operating segment | CECONY | Electric
Segment Reporting Information [Line Items]
Total revenues	1,833	1,807	3,630	3,536
Operating segment | CECONY | Gas
Segment Reporting Information [Line Items]
Total revenues	408	435	1,330	1,276
Operating segment | CECONY | Steam
Segment Reporting Information [Line Items]
Total revenues	90	96	411	410
Operating segment | O&R
Segment Reporting Information [Line Items]
Total revenues	179	198	437	445
Operating segment | O&R | Electric
Segment Reporting Information [Line Items]
Total revenues	138	144	283	293
Operating segment | O&R | Gas
Segment Reporting Information [Line Items]
Total revenues	41	54	154	152
Other
Segment Reporting Information [Line Items]
Total revenues	0	1	(2)	0
Depreciation and amortization	0	0	0	0
Operating income/(loss)	(1)	(2)	(4)	(5)
Inter-segment | CECONY
Segment Reporting Information [Line Items]
Total revenues	(23)	(24)	(47)	(49)
Inter-segment | CECONY | Electric
Segment Reporting Information [Line Items]
Total revenues	5	4	9	8
Inter-segment | CECONY | Gas
Segment Reporting Information [Line Items]
Total revenues	2	2	3	4
Inter-segment | CECONY | Steam
Segment Reporting Information [Line Items]
Total revenues	$ 16	$ 18	$ 35	$ 37

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Fair value of derivative assets
Net Amounts of Assets/ (Liabilities)	$ 458	$ 446
Fair value of derivative liabilities
Net Amounts of Assets/ (Liabilities)	(198)	(66)
Net fair value derivative assets/(liabilities)
Gross Amounts of Recognized Assets/(Liabilities)	(206)	(27)
Gross Amounts Offset	21	(1)
Net Amounts of Assets/ (Liabilities)	(185)	(28)
Margin deposits	6	7
Interest Rate Swap
Fair value of derivative assets
Net Amounts of Assets/ (Liabilities)	0	2
Fair value of derivative liabilities
Net Amounts of Assets/ (Liabilities)	(37)	(6)
CECONY
Fair value of derivative assets
Net Amounts of Assets/ (Liabilities)	429	407
Net fair value derivative assets/(liabilities)
Gross Amounts of Recognized Assets/(Liabilities)	(142)	(7)
Gross Amounts Offset	25	1
Net Amounts of Assets/ (Liabilities)	(117)	(6)
Margin deposits	6	6
Clean Energy Businesses | Interest Rate Swap
Net fair value derivative assets/(liabilities)
Notional amount	829	499
Fair Value of Derivative Liabilities, Current
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(97)	(61)
Gross Amounts Offset	29	11
Net Amounts of Assets/ (Liabilities)	(68)	(50)
Fair Value of Derivative Liabilities, Current | Interest Rate Swap
Fair value of derivative liabilities
Net Amounts of Assets/ (Liabilities)	(5)
Fair Value of Derivative Liabilities, Current | CECONY
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(66)	(31)
Gross Amounts Offset	25	6
Net Amounts of Assets/ (Liabilities)	(41)	(25)
Fair Value of Derivative Liabilities, Noncurrent
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(152)	(25)
Gross Amounts Offset	22	9
Net Amounts of Assets/ (Liabilities)	(130)	(16)
Fair Value of Derivative Liabilities, Noncurrent | Interest Rate Swap
Fair value of derivative liabilities
Net Amounts of Assets/ (Liabilities)	(32)	(6)
Fair Value of Derivative Liabilities, Noncurrent | CECONY
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(106)	(12)
Gross Amounts Offset	20	6
Net Amounts of Assets/ (Liabilities)	(86)	(6)
Fair Value of Derivative Liabilities
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(249)	(86)
Gross Amounts Offset	51	20
Net Amounts of Assets/ (Liabilities)	(198)	(66)
Fair Value of Derivative Liabilities | CECONY
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(172)	(43)
Gross Amounts Offset	45	12
Net Amounts of Assets/ (Liabilities)	(127)	(31)
Fair Value of Derivative Assets, Current
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	37	43
Gross Amounts Offset	(24)	(14)
Net Amounts of Assets/ (Liabilities)	13	29
Fair Value of Derivative Assets, Current | CECONY
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	26	25
Gross Amounts Offset	(16)	(6)
Net Amounts of Assets/ (Liabilities)	10	19
Fair Value of Derivative Assets, Noncurrent
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	6	16
Gross Amounts Offset	(6)	(7)
Net Amounts of Assets/ (Liabilities)	0	9
Fair Value of Derivative Assets, Noncurrent | Interest Rate Swap
Fair value of derivative assets
Net Amounts of Assets/ (Liabilities)		2
Fair Value of Derivative Assets, Noncurrent | CECONY
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	4	11
Gross Amounts Offset	(4)	(5)
Net Amounts of Assets/ (Liabilities)	0	6
Fair Value of Derivative Assets
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	43	59
Gross Amounts Offset	(30)	(21)
Net Amounts of Assets/ (Liabilities)	13	38
Fair Value of Derivative Assets | CECONY
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	30	36
Gross Amounts Offset	(20)	(11)
Net Amounts of Assets/ (Liabilities)	$ 10	$ 25

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Realized and Unrealized Gains (Losses) on Commodity Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	$ (18)	$ 12	$ (20)	$ (12)
Total deferred gains/(losses)	(151)	69	(198)	(5)
Net deferred gains/(losses)	(169)	81	(218)	(17)
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	(17)	(4)	(20)	(1)
Purchased power expense
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	0	0	0	0
Gas purchased for resale
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	0	(1)	(2)	(1)
Non-utility revenue
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	7	(3)	15	0
Other interest expense
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	(24)	0	(34)	0
Other operations and maintenance expense
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income			1	0
Deferred Derivative Gains, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(16)	5	(12)	(17)
Deferred Derivative Gains, Noncurrent
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(2)	7	(8)	5
Deferred Derivative Losses, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(36)	44	(39)	(4)
Recoverable Energy Costs, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(41)	(34)	(59)	(9)
Deferred Derivative Losses, Noncurrent
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(74)	59	(100)	8
CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(15)	9	(17)	(13)
Total deferred gains/(losses)	(139)	64	(180)	(3)
Net deferred gains/(losses)	(154)	73	(197)	(16)
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	0	0	1	0
CECONY | Purchased power expense
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	0	0	0	0
CECONY | Gas purchased for resale
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	0	0	0	0
CECONY | Non-utility revenue
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	0	0	0	0
CECONY | Other interest expense
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	0	0	0	0
CECONY | Other operations and maintenance expense
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income			1	0
CECONY | Deferred Derivative Gains, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(15)	6	(11)	(16)
CECONY | Deferred Derivative Gains, Noncurrent
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	0	3	(6)	3
CECONY | Deferred Derivative Losses, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(34)	42	(34)	(2)
CECONY | Recoverable Energy Costs, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(37)	(34)	(51)	(8)
CECONY | Deferred Derivative Losses, Noncurrent
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	$ (68)	$ 56	$ (95)	$ 7

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Hedged Volume of Derivative Transactions (Details)	Jun. 30, 2019MWgalMMBTUMWh
Electric Energy
Derivatives, Fair Value [Line Items]
Notional amount | MWh	32,178,387
Capacity
Derivatives, Fair Value [Line Items]
Notional amount | MW	19,324
Natural Gas
Derivatives, Fair Value [Line Items]
Notional amount | MMBTU	202,435,409
Refined Fuels
Derivatives, Fair Value [Line Items]
Notional amount | gal	7,728,000
CECONY | Electric Energy
Derivatives, Fair Value [Line Items]
Notional amount | MWh	29,476,875
CECONY | Capacity
Derivatives, Fair Value [Line Items]
Notional amount | MW	8,550
CECONY | Natural Gas
Derivatives, Fair Value [Line Items]
Notional amount | MMBTU	187,910,000
CECONY | Refined Fuels
Derivatives, Fair Value [Line Items]
Notional amount | gal	7,728,000

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Investment Holdings [Line Items]
Energy supply and hedging activities credit exposure total	$ 128
Makeup of net credit exposure non-investment grade/non-rated counterparties	55
Makeup of net credit exposure independent system operators	34
Makeup of net credit exposure with investment-grade counterparties	29
Makeup of net credit exposure with commodity exchange brokers	10
CECONY
Investment Holdings [Line Items]
Energy supply and hedging activities credit exposure total	7
Makeup of net credit exposure with investment-grade counterparties	1
Makeup of net credit exposure with commodity exchange brokers	$ 6

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities - Credit-Risk-Related Contingent Features (Details) $ in Millions	Jun. 30, 2019USD ($)
Derivatives, Fair Value [Line Items]
Aggregate fair value – net liabilities	$ 159
Collateral posted	34
Downgrade One Level from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	37
Downgrade to Below Investment Grade from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	140
Derivatives in net asset position additional collateral	15
CECONY
Derivatives, Fair Value [Line Items]
Aggregate fair value – net liabilities	137
Collateral posted	27
CECONY | Downgrade One Level from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	31
CECONY | Downgrade to Below Investment Grade from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	$ 118

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 458		$ 446
Derivative liabilities	198		66
Transfer out of level 3	0	$ 1
CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	429		407
Transfer out of level 3	0	$ 1
Netting Adjustment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	(8)		(6)
Derivative liabilities	(37)		(11)
Netting Adjustment | CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		(1)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	324		293
Derivative liabilities	15		8
Level 1 | CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	303		270
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	140		152
Derivative liabilities	172		49
Level 2 | CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	125		137
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2		7
Derivative liabilities	48		20
Level 3 | CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	1		1
Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	19		43
Derivative liabilities	161		60
Transfer out of level 3			2
Commodity | CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	16		31
Derivative liabilities	127		32
Transfer out of level 3			2
Commodity | Netting Adjustment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	(8)		(6)
Derivative liabilities	(37)		(11)
Commodity | Netting Adjustment | CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		(1)
Derivative liabilities	(31)		(6)
Commodity | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	3		6
Derivative liabilities	15		8
Commodity | Level 1 | CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2		3
Derivative liabilities	13		5
Commodity | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	22		36
Derivative liabilities	135		43
Commodity | Level 2 | CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	13		28
Derivative liabilities	114		30
Commodity | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2		7
Derivative liabilities	48		20
Commodity | Level 3 | CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	1		1
Derivative liabilities	31		3
Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		2
Derivative liabilities	37		6
Interest rate swap | Netting Adjustment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Derivative liabilities	0		0
Interest rate swap | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Derivative liabilities	0		0
Interest rate swap | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		2
Derivative liabilities	37		6
Interest rate swap | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Derivative liabilities	0		0
Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	439		401
Other | CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	413		376
Other | Netting Adjustment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Other | Netting Adjustment | CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Other | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	321		287
Other | Level 1 | CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	301		267
Other | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	118		114
Other | Level 2 | CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	112		109
Other | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Other | Level 3 | CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 0		$ 0

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Commodity Derivatives (Details) $ in Millions	Jun. 30, 2019USD ($)$ / MWh$ / Dt$ / kW-month	Dec. 31, 2018USD ($)
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ 458	$ 446
CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	429	407
Level 3
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	2	7
Level 3 | CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	1	$ 1
Level 3 | Electricity | Forward energy prices
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (27)
Level 3 | Electricity | Forward energy prices | Minimum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) | $ / MWh	20
Level 3 | Electricity | Forward energy prices | Maximum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) | $ / MWh	71.70
Level 3 | Electricity | Forward energy prices | CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (25)
Level 3 | Electricity | Forward energy prices | CECONY | Minimum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) | $ / MWh	21.70
Level 3 | Electricity | Forward energy prices | CECONY | Maximum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) | $ / MWh	71.70
Level 3 | Electricity | Forward capacity prices
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (16)
Level 3 | Electricity | Forward capacity prices | Minimum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) | $ / kW-month	0.70
Level 3 | Electricity | Forward capacity prices | Maximum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) | $ / kW-month	4.83
Level 3 | Electricity | Forward capacity prices | CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (6)
Level 3 | Electricity | Forward capacity prices | CECONY | Minimum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) | $ / kW-month	0.70
Level 3 | Electricity | Forward capacity prices | CECONY | Maximum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) | $ / kW-month	4.80
Level 3 | Natural Gas | Forward natural gas prices
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (4)
Level 3 | Natural Gas | Forward natural gas prices | Minimum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) | $ / Dt	1.45
Level 3 | Natural Gas | Forward natural gas prices | Maximum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) | $ / Dt	2.31
Level 3 | Transmission Congestion Contracts/Financial Transmission Rights | Inter-zonal forward price curves adjusted for historical zonal losses
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ 1
Level 3 | Transmission Congestion Contracts/Financial Transmission Rights | Inter-zonal forward price curves adjusted for historical zonal losses | Minimum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) | $ / MWh	0.03
Level 3 | Transmission Congestion Contracts/Financial Transmission Rights | Inter-zonal forward price curves adjusted for historical zonal losses | Maximum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) | $ / MWh	4.29
Level 3 | Transmission Congestion Contracts | Inter-zonal forward price curves adjusted for historical zonal losses | CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ 1
Level 3 | Transmission Congestion Contracts | Inter-zonal forward price curves adjusted for historical zonal losses | CECONY | Minimum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) | $ / MWh	0.43
Level 3 | Transmission Congestion Contracts | Inter-zonal forward price curves adjusted for historical zonal losses | CECONY | Maximum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) | $ / MWh	3.13
Level 3 | Commodity
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (46)
Level 3 | Commodity | CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (30)

Fair Value Measurements - Recon

Fair Value Measurements - Reconciliation of Assets and Liabilities Measured at Level 3 Fair Value (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (19)	$ 3	$ (13)	$ 1	$ 1
Included in earnings	0	(3)	(4)	1
Included in regulatory assets and liabilities	(27)	(1)	(31)	(1)
Settlements	0	(3)	2	(6)
Transfer out of level 3			0	1
Ending balance	(46)	(4)	(46)	(4)	(13)
CECONY
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(5)	2	(2)	4	4
Included in earnings	1	1	1	3
Included in regulatory assets and liabilities	(25)	(2)	(28)	(5)
Settlements	(1)	(1)	(1)	(3)
Transfer out of level 3			0	1
Ending balance	$ (30)	$ 0	$ (30)	$ 0	$ (2)

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - Non-utility revenue - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Change in fair value relating to Level 3 commodity derivative assets and liabilities	$ (5)	$ (1)	$ (4)
Clean Energy Businesses
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gain (loss) on Level 3 commodity derivative assets and liabilities	$ (6)	$ (1)	$ (4)

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Details) - Variable Interest Entity, Primary Beneficiary $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2018MW
Texas Solar 4
Variable Interest Entity [Line Items]
Generating capacity (MW AC) | MW			40
Tax Equity Projects
Variable Interest Entity [Line Items]
Net income (loss)	$ (15)	$ (34)
Income (loss) before tax	(12)	(26)
Con Edison Development | Texas Solar 4
Variable Interest Entity [Line Items]
Percentage of variable interests (less than)			80.00%
Con Edison Development | Tax Equity Projects
Variable Interest Entity [Line Items]
Percentage of variable interests (less than)			100.00%
Tax Equity Investors | Tax Equity Projects
Variable Interest Entity [Line Items]
Net income (loss)	28	49
Income (loss) before tax	$ 21	$ 37

Variable Interest Entities - Ne

Variable Interest Entities - Net Assets (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Noncontrolling interest	$ 156	$ 113
Great Valley Solar
Variable Interest Entity [Line Items]
Restricted cash	0	0
Non-utility property, less accumulated depreciation	309	313
Other assets	39	18
Total assets	348	331
Long-term debt due within one year	0	0
Other liabilities	32	17
Long-term debt	0	0
Total liabilities	32	17
Accumulated depreciation	5	1
Great Valley Solar | Tax Equity Investors
Variable Interest Entity [Line Items]
Noncontrolling interest	48	33
Copper Mountain - Mesquite Solar
Variable Interest Entity [Line Items]
Restricted cash	0	0
Non-utility property, less accumulated depreciation	488	492
Other assets	109	97
Total assets	597	589
Long-term debt due within one year	0	0
Other liabilities	43	33
Long-term debt	0	0
Total liabilities	43	33
Accumulated depreciation	8	1
Copper Mountain - Mesquite Solar | Tax Equity Investors
Variable Interest Entity [Line Items]
Noncontrolling interest	99	71
Texas Solar 4
Variable Interest Entity [Line Items]
Restricted cash	7	4
Non-utility property, less accumulated depreciation	96	98
Other assets	10	9
Total assets	113	111
Long-term debt due within one year	57	2
Other liabilities	28	26
Long-term debt	0	56
Total liabilities	85	84
Accumulated depreciation	$ 17	15
Texas Solar 4 | Third Party
Variable Interest Entity [Line Items]
Noncontrolling interest		$ 7