Consolidated Edison (ED) 10-Q6 Aug 202020 Q2 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page - shares	6 Months Ended
Cover Page - shares	Jun. 30, 2020	Jul. 31, 2020
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	1-14514
Entity Registrant Name	Consolidated Edison, Inc.
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		334,496,595
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001047862
Current Fiscal Year End Date	--12-31
CECONY
Document Information [Line Items]
Entity File Number	1-1217
Entity Registrant Name	Consolidated Edison Company of New York, Inc.
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
Entity Central Index Key	0000023632
Current Fiscal Year End Date	--12-31

Consolidated Income Statement (

Consolidated Income Statement (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
OPERATING REVENUES
Total operating revenues	$ 2,719	$ 2,744	$ 5,953	$ 6,258
OPERATING EXPENSES
Depreciation and amortization	476	418	946	831
Taxes, other than income taxes	604	578	1,242	1,183
TOTAL OPERATING EXPENSES	2,240	2,286	4,666	5,014
OPERATING INCOME	479	458	1,287	1,244
OTHER INCOME (DEDUCTIONS)
Investment and other income	25	22	51	45
Other income	4	4	6	15
Allowance for equity funds used during construction	5	4	10	7
Other deductions	(55)	(27)	(126)	(50)
TOTAL OTHER INCOME (DEDUCTIONS)	(21)	3	(59)	17
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	458	461	1,228	1,261
INTEREST EXPENSE
Interest on long-term debt	234	219	459	440
Other interest	15	47	117	77
Allowance for borrowed funds used during construction	(2)	(3)	(6)	(7)
NET INTEREST EXPENSE	247	263	570	510
INCOME BEFORE INCOME TAX EXPENSE	211	198	658	751
INCOME TAX EXPENSE	9	19	64	127
NET INCOME	202	179	594	624
Income attributable to non-controlling interest	12	27	29	48
NET INCOME FOR COMMON STOCK	$ 190	$ 152	$ 565	$ 576
Net income per common share - basic (dollars per share)	$ 0.57	$ 0.46	$ 1.69	$ 1.77
Net income per common share - diluted (dollars per share)	$ 0.57	$ 0.46	$ 1.69	$ 1.77
AVERAGE NUMBER OF SHARES OUTSTANDING-BASIC (shares)	334.1	328.3	333.8	325.2
AVERAGE NUMBER OF SHARES OUTSTANDING—DILUTED (shares)	335	329.2	334.7	326.1
Electric
OPERATING REVENUES
Total operating revenues	$ 1,983	$ 1,971	$ 3,890	$ 3,912
Gas
OPERATING REVENUES
Total operating revenues	453	449	1,384	1,484
OPERATING EXPENSES
Operating costs	77	131	309	573
Steam
OPERATING REVENUES
Total operating revenues	84	90	334	411
Non-utility
OPERATING REVENUES
Total operating revenues	199	234	345	451
Power
OPERATING EXPENSES
Operating costs	380	352	688	719
Fuel
OPERATING EXPENSES
Operating costs	23	26	101	133
Other operations and maintenance
OPERATING EXPENSES
Operating costs	680	781	1,380	1,575
CECONY
OPERATING REVENUES
Total operating revenues	2,345	2,331	5,200	5,371
OPERATING EXPENSES
Depreciation and amortization	396	339	786	673
Taxes, other than income taxes	579	550	1,186	1,125
TOTAL OPERATING EXPENSES	1,956	1,955	4,068	4,270
OPERATING INCOME	389	376	1,132	1,101
OTHER INCOME (DEDUCTIONS)
Investment and other income	3	4	5	13
Allowance for equity funds used during construction	4	3	9	6
Other deductions	(47)	(22)	(114)	(41)
TOTAL OTHER INCOME (DEDUCTIONS)	(40)	(15)	(100)	(22)
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	349	361	1,032	1,079
INTEREST EXPENSE
Interest on long-term debt	185	165	358	334
Other interest	7	19	19	36
Allowance for borrowed funds used during construction	(2)	(2)	(5)	(6)
NET INTEREST EXPENSE	190	182	372	364
INCOME BEFORE INCOME TAX EXPENSE	159	179	660	715
INCOME TAX EXPENSE	7	27	102	151
NET INCOME FOR COMMON STOCK	152	152	558	564
CECONY \| Electric
OPERATING REVENUES
Total operating revenues	1,845	1,833	3,616	3,630
CECONY \| Gas
OPERATING REVENUES
Total operating revenues	416	408	1,250	1,330
OPERATING EXPENSES
Operating costs	64	76	260	393
CECONY \| Steam
OPERATING REVENUES
Total operating revenues	84	90	334	411
CECONY \| Power
OPERATING EXPENSES
Operating costs	345	313	618	635
CECONY \| Fuel
OPERATING EXPENSES
Operating costs	23	26	101	133
CECONY \| Other operations and maintenance
OPERATING EXPENSES
Operating costs	$ 549	$ 651	$ 1,117	$ 1,311

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
NET INCOME	$ 202	$ 179	$ 594	$ 624
NET INCOME	190	152	565	576
INCOME ATTRIBUTABLE TO NON-CONTROLLING INTEREST	(12)	(27)	(29)	(48)
OTHER COMPREHENSIVE INCOME, NET OF TAXES
Pension and other postretirement benefit plan liability adjustments, net of taxes	0	1	5	5
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	0	1	5	5
COMPREHENSIVE INCOME	190	153	570	581
CECONY
NET INCOME	152	152	558	564
OTHER COMPREHENSIVE INCOME, NET OF TAXES
Pension and other postretirement benefit plan liability adjustments, net of taxes	1	0	2	0
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	0	2	0
COMPREHENSIVE INCOME	$ 153	$ 152	$ 560	$ 564

Consolidated Statement of Cash

Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Net income	$ 594	$ 624
Net income	565	576
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	946	831
Deferred income taxes	61	126
Rate case amortization and accruals	(20)	(59)
Common equity component of allowance for funds used during construction	(10)	(7)
Net derivative losses	89	31
Unbilled revenue and net unbilled revenue deferrals	3	(4)
Gain on sale of assets	0	(5)
Other non-cash items, net	102	(17)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable – customers	(113)	165
Materials and supplies, including fuel oil and gas in storage	16	14
Revenue decoupling mechanism receivable	(80)	(127)
Other receivables and other current assets	(10)	125
Taxes receivable	(1)	19
Prepayments	(31)	(35)
Accounts payable	(168)	(156)
Pensions and retiree benefits obligations, net	100	168
Pensions and retiree benefits contributions	(79)	(78)
Superfund and environmental remediation costs, net	(3)	(7)
Accrued taxes	(23)	(15)
Accrued interest	(1)	25
Distributions from equity investments	20	27
System benefit charge	(46)	(1)
Deferred charges, noncurrent assets and other regulatory assets	(110)	(213)
Deferred credits and other regulatory liabilities	(19)	162
Other current and noncurrent liabilities	(37)	(55)
NET CASH FLOWS FROM OPERATING ACTIVITIES	1,180	1,538
INVESTING ACTIVITIES
Utility construction expenditures	(1,528)	(1,613)
Cost of removal less salvage	(141)	(142)
Non-utility construction expenditures	(258)	(92)
Investments in electric and gas transmission projects	(15)	(88)
Proceeds from sale of assets	0	48
Other investing activities	10	11
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,932)	(1,876)
FINANCING ACTIVITIES
Net payment of short-term debt	121	(1,405)
Issuance of long-term debt	1,600	1,989
Retirement of long-term debt	(442)	(657)
Debt issuance costs	(24)	(17)
Common stock dividends	(487)	(455)
Issuance of common shares - public offering	88	825
Issuance of common shares for stock plans	28	27
Distribution to noncontrolling interest	(4)	(5)
NET CASH FLOWS FROM FINANCING ACTIVITIES	880	302
CASH, TEMPORARY CASH INVESTMENTS, AND RESTRICTED CASH:
NET CHANGE FOR THE PERIOD	128	(36)
BALANCE AT BEGINNING OF PERIOD	1,217	1,006
BALANCE AT END OF PERIOD	1,345	970
Cash paid/(received) during the period for:
Interest	420	422
Income taxes	22	(15)
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	359	332
Issuance of common shares for dividend reinvestment	24	24
CECONY
Net income	558	564
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	786	673
Deferred income taxes	47	90
Rate case amortization and accruals	(21)	(58)
Common equity component of allowance for funds used during construction	(9)	(6)
Unbilled revenue and net unbilled revenue deferrals	28	21
Gain on sale of assets	0	(5)
Other non-cash items, net	46	(10)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable – customers	(106)	143
Materials and supplies, including fuel oil and gas in storage	16	17
Revenue decoupling mechanism receivable	(71)	(126)
Other receivables and other current assets	17	115
Accounts receivable from affiliated companies	(9)	83
Prepayments	(18)	(33)
Accounts payable	(136)	(140)
Accounts payable to affiliated companies	3	(2)
Pensions and retiree benefits obligations, net	94	157
Pensions and retiree benefits contributions	(78)	(77)
Superfund and environmental remediation costs, net	(7)	(8)
Accrued taxes	(24)	(18)
Accrued interest	11	(2)
System benefit charge	(44)	0
Deferred charges, noncurrent assets and other regulatory assets	(118)	(216)
Deferred credits and other regulatory liabilities	55	146
Other current and noncurrent liabilities	(45)	(17)
NET CASH FLOWS FROM OPERATING ACTIVITIES	975	1,291
INVESTING ACTIVITIES
Utility construction expenditures	(1,435)	(1,501)
Cost of removal less salvage	(139)	(138)
Proceeds from sale of assets	0	48
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,574)	(1,591)
FINANCING ACTIVITIES
Net payment of short-term debt	(22)	(343)
Issuance of long-term debt	1,600	700
Retirement of long-term debt	(350)	(475)
Debt issuance costs	(25)	(8)
Capital contribution by parent	50	850
Dividend to parent	(491)	(456)
NET CASH FLOWS FROM FINANCING ACTIVITIES	762	268
CASH, TEMPORARY CASH INVESTMENTS, AND RESTRICTED CASH:
NET CHANGE FOR THE PERIOD	163	(32)
BALANCE AT BEGINNING OF PERIOD	933	818
BALANCE AT END OF PERIOD	1,096	786
Cash paid/(received) during the period for:
Interest	341	340
Income taxes	62	(20)
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	271	297
Software Licenses
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	51	80
Software Licenses \| CECONY
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	48	76
Equipment
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	28	0
Equipment \| CECONY
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	$ 28	$ 0

Consolidated Balance Sheet (Una

Consolidated Balance Sheet (Unaudited) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
CURRENT ASSETS
Cash and temporary cash investments	$ 1,144	$ 981
Accounts receivable - customers, less allowance for uncollectible accounts	1,332	1,236
Other receivables, less allowance for uncollectible accounts	194	184
Taxes receivable	21	20
Accrued unbilled revenue	542	599
Fuel oil, gas in storage, materials and supplies, at average cost	336	352
Prepayments	291	260
Regulatory assets	117	128
Restricted cash	201	236
Revenue decoupling mechanism	156	76
Other current assets	230	200
TOTAL CURRENT ASSETS	4,564	4,272
INVESTMENTS	2,080	2,065
UTILITY PLANT, AT ORIGINAL COST
General	3,617	3,562
TOTAL	49,278	48,136
Less: Accumulated depreciation	10,793	10,322
Net	38,485	37,814
Construction work in progress	2,097	1,937
NET UTILITY PLANT	40,582	39,751
NON-UTILITY PLANT
Non-utility property, less accumulated depreciation	3,908	3,829
Construction work in progress	407	309
NET PLANT	44,897	43,889
OTHER NONCURRENT ASSETS
Goodwill	446	446
Intangible assets, less accumulated amortization of $152 and $126 in 2020 and 2019, respectively	1,510	1,557
Regulatory assets	4,606	4,859
Operating lease right-of-use asset	853	857
Other deferred charges and noncurrent assets	125	134
TOTAL OTHER NONCURRENT ASSETS	7,540	7,853
TOTAL ASSETS	59,081	58,079
CURRENT LIABILITIES
Long-term debt due within one year	1,965	1,446
Notes payable	1,813	1,692
Accounts payable	1,018	1,164
Customer deposits	332	346
Accrued taxes	53	76
Accrued interest	152	153
Accrued wages	117	102
Fair value of derivative liabilities	170	123
Regulatory liabilities	63	102
System benefit charge	601	647
Operating lease liabilities	83	65
Other current liabilities	338	371
TOTAL CURRENT LIABILITIES	6,705	6,287
NONCURRENT LIABILITIES
Provision for injuries and damages	126	130
Pensions and retiree benefits	1,205	1,516
Superfund and other environmental costs	734	734
Asset retirement obligations	433	425
Fair value of derivative liabilities	242	105
Deferred income taxes and unamortized investment tax credits	6,337	6,227
Operating lease liabilities	811	809
Regulatory liabilities	4,652	4,827
Other deferred credits and noncurrent liabilities	246	279
TOTAL NONCURRENT LIABILITIES	14,786	15,052
LONG-TERM DEBT	19,149	18,527
EQUITY
Common shareholders’ equity	18,225	18,022
Noncontrolling interest	216	191
TOTAL EQUITY (See Statement of Equity)	18,441	18,213
TOTAL LIABILITIES AND EQUITY	59,081	58,079
Electric
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	32,575	31,866
Gas
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	10,457	10,107
Steam
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	2,629	2,601
CECONY
CURRENT ASSETS
Cash and temporary cash investments	1,096	933
Accounts receivable - customers, less allowance for uncollectible accounts	1,243	1,153
Other receivables, less allowance for uncollectible accounts	105	120
Accrued unbilled revenue	395	477
Accounts receivable from affiliated companies	82	73
Fuel oil, gas in storage, materials and supplies, at average cost	277	293
Prepayments	196	178
Regulatory assets	97	113
Revenue decoupling mechanism	147	76
Other current assets	109	127
TOTAL CURRENT ASSETS	3,747	3,543
INVESTMENTS	475	461
UTILITY PLANT, AT ORIGINAL COST
General	3,325	3,271
TOTAL	46,176	45,090
Less: Accumulated depreciation	9,928	9,490
Net	36,248	35,600
Construction work in progress	1,955	1,812
NET UTILITY PLANT	38,203	37,412
NON-UTILITY PLANT
Non-utility property, less accumulated depreciation	2	2
NET PLANT	38,205	37,414
OTHER NONCURRENT ASSETS
Regulatory assets	4,252	4,487
Operating lease right-of-use asset	593	601
Other deferred charges and noncurrent assets	52	51
TOTAL OTHER NONCURRENT ASSETS	4,897	5,139
TOTAL ASSETS	47,324	46,557
CURRENT LIABILITIES
Long-term debt due within one year	640	350
Notes payable	1,115	1,137
Accounts payable	805	956
Accounts payable to affiliated companies	16	13
Customer deposits	318	334
Accrued taxes	47	71
Accrued interest	124	113
Accrued wages	107	92
Fair value of derivative liabilities	69	81
Regulatory liabilities	39	63
System benefit charge	543	587
Operating lease liabilities	64	54
Other current liabilities	240	280
TOTAL CURRENT LIABILITIES	4,127	4,131
NONCURRENT LIABILITIES
Provision for injuries and damages	121	125
Pensions and retiree benefits	956	1,241
Superfund and other environmental costs	654	654
Asset retirement obligations	369	362
Fair value of derivative liabilities	128	65
Deferred income taxes and unamortized investment tax credits	6,159	6,000
Operating lease liabilities	559	551
Regulatory liabilities	4,222	4,427
Other deferred credits and noncurrent liabilities	210	240
TOTAL NONCURRENT LIABILITIES	13,378	13,665
LONG-TERM DEBT	15,554	14,614
EQUITY
Common shareholders’ equity	14,265	14,147
TOTAL LIABILITIES AND EQUITY	47,324	46,557
CECONY \| Electric
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	30,660	29,989
CECONY \| Gas
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	9,562	9,229
CECONY \| Steam
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	$ 2,629	$ 2,601

Consolidated Balance Sheet (U_2

Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Accounts receivable - customers, allowance for uncollectible accounts	$ 87	$ 70
Other receivables, allowance for uncollectible accounts	5	4
Non-utility property, accumulated depreciation	456	391
Intangible assets, accumulated amortization	152	126
CECONY
Accounts receivable - customers, allowance for uncollectible accounts	81	65
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, 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
Beginning Balance at Dec. 31, 2018									$ 12,910	$ 589	$ 4,769	$ 8,581	$ (962)	$ (62)	$ (5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	445			424				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
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
Beginning Balance at Dec. 31, 2018									12,910	$ 589	4,769	8,581	(962)	(62)	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	624
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
Ending Balance at Jun. 30, 2019									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
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				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
Ending Balance at Jun. 30, 2019									13,868	$ 589	5,619	8,689	(962)	(62)	(5)
Beginning Balance (shares) at Dec. 31, 2019		333			23
Beginning Balance (shares) at Dec. 31, 2019										235
Beginning Balance at Dec. 31, 2019	18,213	$ 35	8,054	11,100	$ (1,038)	(110)	(19)	191
Beginning Balance at Dec. 31, 2019	18,022								14,147	$ 589	5,669	8,919	(962)	(62)	(6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	392			375				17
Net income									406			406
Common stock dividends	(255)			(255)					(246)			(246)
Issuance of common shares – public offering (shares)		1
Issuance of common shares - public offering	88		88
Issuance of common shares for stock plans	26		26
Capital contribution by parent									25		25
Other comprehensive income	5						5		1						1
Distributions to noncontrolling interest	(2)							(2)
Ending Balance (shares) at Mar. 31, 2020		334			23
Ending Balance (shares) at Mar. 31, 2020										235
Ending Balance at Mar. 31, 2020	18,467	$ 35	8,168	11,220	$ (1,038)	(110)	(14)	206
Ending Balance at Mar. 31, 2020									14,333	$ 589	5,694	9,079	(962)	(62)	(5)
Beginning Balance (shares) at Dec. 31, 2019		333			23
Beginning Balance (shares) at Dec. 31, 2019										235
Beginning Balance at Dec. 31, 2019	18,213	$ 35	8,054	11,100	$ (1,038)	(110)	(19)	191
Beginning Balance at Dec. 31, 2019	18,022								14,147	$ 589	5,669	8,919	(962)	(62)	(6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	594
Net income	565								558
Other comprehensive income	5								2
Ending Balance (shares) at Jun. 30, 2020		334			23
Ending Balance (shares) at Jun. 30, 2020										235
Ending Balance at Jun. 30, 2020	18,441	$ 35	8,198	11,154	$ (1,038)	(110)	(14)	216
Ending Balance at Jun. 30, 2020	18,225								14,265	$ 589	5,719	8,985	(962)	(62)	(4)
Beginning Balance (shares) at Mar. 31, 2020		334			23
Beginning Balance (shares) at Mar. 31, 2020										235
Beginning Balance at Mar. 31, 2020	18,467	$ 35	8,168	11,220	$ (1,038)	(110)	(14)	206
Beginning Balance at Mar. 31, 2020									14,333	$ 589	5,694	9,079	(962)	(62)	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	202			190				12
Net income	190								152			152
Common stock dividends	(256)			(256)					(246)			(246)
Issuance of common shares – public offering (shares)
Issuance of common shares - public offering	0
Issuance of common shares for stock plans	30		30
Capital contribution by parent									25		25
Other comprehensive income	0								1						1
Distributions to noncontrolling interest	(2)							(2)
Ending Balance (shares) at Jun. 30, 2020		334			23
Ending Balance (shares) at Jun. 30, 2020										235
Ending Balance at Jun. 30, 2020	18,441	$ 35	$ 8,198	$ 11,154	$ (1,038)	$ (110)	$ (14)	$ 216
Ending Balance at Jun. 30, 2020	$ 18,225								$ 14,265	$ 589	$ 5,719	$ 8,985	$ (962)	$ (62)	$ (4)

Consolidated Statement of Equ_2

Consolidated Statement of Equity/Shareholder's Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Common stock dividends per share (dollars per share)	$ 0.76	$ 0.76	$ 0.74	$ 0.74

General

General	6 Months Ended
General	Jun. 30, 2020
Accounting Policies [Abstract]
General	General These combined notes accompany and form an integral part of the separate interim 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 statement 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, 2019 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, 2020. 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., through its subsidiaries, develops, owns and operates renewable and energy infrastructure projects and provides energy-related products and services to wholesale and 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, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies and Other Matters	Summary of Significant Accounting Policies and Other Matters Financial Instruments – Credit Losses Adoption of New Standard In January 2020, the Companies adopted Accounting Standards Update (ASU) 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (CECL). 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 subject to the amendments are included in the lines “Accounts receivable – customers” and “Other receivables.” Substantially all of these in-scope financial instruments are expected to be collected within one year of billing. The Companies adopted the amendments using the modified retrospective method for all financial instruments measured at amortized costs. Results for reporting periods beginning after January 1, 2020 are presented under Accounting Standards Codification (ASC) 326 while prior period amounts continue to be reported in accordance with previously applicable GAAP. No prior period adjustment or charge to retained earnings for cumulative impact was required as a result of the Companies’ adoption of the amendments. The Utilities’ “Account receivable – customers” balance consists of utility bills due (bills are generally due the month following billing) from customers who have energy delivered, generated, or services provided by the Utilities. The balance also reflects the Utilities’ purchase of receivables from energy service companies to support the retail choice programs. “Other receivables” balance generally reflects costs billed by the Utilities for goods and services provided to external parties, such as accommodation work for private parties and certain governmental entities, real estate rental and pole attachments. The Clean Energy Businesses’ other receivables balance includes bills related to the sale of energy from renewable electric production projects. The Clean Energy Businesses’ customer accounts receivable balance generally reflects the management of energy supply assets, energy-efficiency services to government and commercial customers, and the engineering, procurement, and construction services of renewable energy projects. The Clean Energy Businesses calculate an allowance for uncollectible accounts related to their energy services customers based on an aging and customer-specific analysis. The amount of such reserves was not material at June 30, 2020. The Companies develop expected loss estimates using past events data and consider current conditions and future reasonable and supportable forecasts. Changes to the Utilities’ reserve balances that result in write-offs of customer accounts receivable balances above existing rate allowances are not reflected in rates during the term of the current rate plans. For the Utilities’ customer accounts receivable allowance for uncollectible accounts, past events considered include write-offs relative to customer accounts receivable; current conditions include macro-and micro-economic conditions related to trends in the local economy and bankruptcy rates and aged customer accounts receivable balances, among other factors; and forecasts about the future include assumptions related to the level of write-offs and recoveries. Other receivables allowance for uncollectible accounts is calculated based on a historical average of collections relative to total other receivables, including current receivables. Current macro- and micro-economic conditions are also considered when calculating the current reserve. Probable outcomes of pending litigation, whether favorable or unfavorable to the Companies, are also included in the consideration. During the first six months of 2020, the potential economic impact of the COVID-19 pandemic was also considered in forward-looking projections related to write-off and recovery rates and resulted in increases to the allowance for uncollectible accounts. The increases to the allowance for uncollectible accounts for Con Edison and CECONY were $12 million and $11 million , respectively, for the three months ended June 30, 2020 and $18 million and $16 million , respectively, for the six months ended June 30, 2020. Customer accounts receivable and the associated allowance for uncollectible accounts are included in the line “Accounts receivable – customers” on the Companies’ consolidated balance sheets. Other receivables and the associated allowance for uncollectible accounts are included in “Other receivables” on the consolidated balance sheets. The table below presents a rollforward by major portfolio segment type for the three and six months ended June 30, 2020 : For the Three Months Ended June 30, 2020 Con Edison CECONY (Millions of Dollars) Accounts receivable - customers Other receivables Accounts receivable - customers Other receivables Allowance for credit losses Beginning Balance at April 1, 2020 $75 $5 $70 $3 Recoveries 2 — 2 — Write-offs (15) (1) (14) — Reserve adjustments 25 1 23 — Ending Balance June 30, 2020 $87 $5 $81 $3 For the Six Months Ended June 30, 2020 Con Edison CECONY (Millions of Dollars) Accounts receivable - customers Other receivables Accounts receivable - customers Other receivables Allowance for credit losses Beginning Balance at January 1, 2020 $70 $4 $65 $3 Recoveries 4 — 4 — Write-offs (34) (1) (32) (1) Reserve adjustments 47 2 44 1 Ending Balance June 30, 2020 $87 $5 $81 $3 General Utility Plant General utility plant of Con Edison and CECONY included $90 million and $85 million , respectively, at June 30, 2020 and $93 million and $88 million , respectively, at December 31, 2019 , 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 $13 million at June 30, 2020 and $10 million at December 31, 2019 . Goodwill The Companies test goodwill for impairment at least annually or whenever there is a triggering event, and test long-lived and intangible assets for recoverability when events or changes in circumstances indicate that the carrying value of long-lived or intangible assets may not be recoverable. The Companies identified no triggering events or changes in circumstances related to the COVID-19 pandemic that would indicate that the carrying value of long-lived or intangible assets may not be recoverable at June 30, 2020. Long-Lived and Intangible Assets In January 2019, Pacific Gas and Electric Company (PG&E) filed in the United States Bankruptcy Court for the Northern District of California for reorganization under Chapter 11 of the U.S. Bankruptcy Code. The output of certain of the Clean Energy Businesses' renewable electric production projects with an aggregate generating capacity of 680 MW (AC) (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. In July 2020, PG&E’s plan of reorganization, previously confirmed by the bankruptcy court in June 2020, became effective. The California Public Utilities Commission also approved PG&E’s plan of reorganization and found that it complied with the wildfire fund legislation enacted by California in July 2019. The wildfire fund legislation 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. The PG&E bankruptcy was an event of default under the PG&E PPAs. Distributions from the related projects to the Clean Energy Businesses were restricted during the pendency of the bankruptcy. As of the effective date of the plan of reorganization, PG&E assumed all of the PG&E PPAs. In July 2020, the Clean Energy Businesses received previously restricted distributions and have resumed distributions for all projects. See “Reconciliation of Cash, Temporary Cash Investments and Restricted Cash,” below. Also, as a result of PG&E assuming all of the PG&E PPAs and emerging from bankruptcy, the Clean Energy Businesses have received full payment of all past due receivables, and all related project debt with a maturity longer than one year has been reclassified to long-term debt. 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. For the three and six months ended June 30, 2020 and 2019 , 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) 2020 2019 2020 2019 Net income for common stock $190 $152 $565 $576 Weighted average common shares outstanding – basic 334.1 328.3 333.8 325.2 Add: Incremental shares attributable to effect of potentially dilutive securities 0.9 0.9 0.9 0.9 Adjusted weighted average common shares outstanding – diluted 335.0 329.2 334.7 326.1 Net Income per common share – basic $0.57 $0.46 $1.69 $1.77 Net Income per common share – diluted $0.57 $0.46 $1.69 $1.77 The computation of diluted EPS for the three and six months ended June 30, 2020 and 2019 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, 2020 and 2019 , 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) 2020 2019 2020 2019 Beginning balance, accumulated OCI, net of taxes (a) $(14) $(12) $(5) $(5) Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2020 (a)(b) — 1 1 — Current period OCI, net of taxes — 1 1 — Ending balance, accumulated OCI, net of taxes $(14) $(11) $(4) $(5) For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Beginning balance, accumulated OCI, net of taxes (a) $(19) $(16) $(6) $(5) OCI before reclassifications, net of tax of $(1) for Con Edison in 2020 and 2019 4 2 — — Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2020 and 2019 (a)(b) 1 3 2 — Current period OCI, net of taxes 5 5 2 — Ending balance, accumulated OCI, net of taxes $(14) $(11) $(4) $(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 and liabilities 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, 2020 and 2019 , cash, temporary cash investments and restricted cash for Con Edison and CECONY were as follows: At June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Cash and temporary cash investments $1,144 $831 $1,096 $786 Restricted cash (a) 201 139 — — Total cash, temporary cash investments and restricted cash $1,345 $970 $1,096 $786 (a) Restricted cash included cash of the Clean Energy Businesses' renewable electric production project subsidiaries ( $192 million and $138 million at June 30, 2020 and 2019 , respectively) that, under the related project debt agreements, is either 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 or restricted as a result of the PG&E bankruptcy. During the pendency of the PG&E bankruptcy, cash was not distributed from the related projects to the Clean Energy Businesses. In July 2020, PG&E’s plan of reorganization became effective. In July 2020, the Clean Energy Businesses received previously restricted distributions and have resumed distributions for all projects. See “Long-Lived and Intangible Assets,” above, and Note C. At June 30, 2020, restricted cash included cash deposits held by the Clean Energy Businesses’ battery storage business ($9 million). At June 30, 2019, 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 ) .

Regulatory Matters

Regulatory Matters	6 Months Ended
Regulatory Matters	Jun. 30, 2020
Regulated Operations [Abstract]
Regulatory Matters	Regulatory Matters COVID-19 Regulatory Matters Governors, public utility commissions, federal authorities and other regulatory agencies in the states in which the Utilities operate have issued orders related to the COVID-19 pandemic that impact the Utilities as described below. New York State Regulation In March 2020, New York State Governor Cuomo declared a State Disaster Emergency for the State of New York, due to the COVID-19 pandemic and signed the "New York State on PAUSE" executive order that closed all non-essential businesses statewide. New York State designated utilities, including CECONY and O&R, as essential businesses that were able to continue a portion of their work during the effectiveness of the PAUSE order. In May 2020, the "New York Forward" plan went into effect. New York Forward is a phased plan to reopen businesses in geographic areas of New York State that meet metrics established by various public health organizations. Since the emergency declaration, and due to economic conditions, the NYSPSC and the Utilities have mitigated the potential impact of the COVID-19 pandemic on the Utilities, their customers and other stakeholders. In March 2020, the Utilities began suspending service disconnections, certain collection notices, final bill collection agency activity, new late payment charges and certain other fees for all customers. The Utilities also began providing payment extensions for all customers that were scheduled to be disconnected prior to the start of the COVID-19 pandemic. In June 2020, the state of New York enacted a law prohibiting New York utilities, including CECONY and O&R, from disconnecting residential customers during the COVID-19 state of emergency. In addition, such prohibition will apply for an additional 180 days after the state of emergency ends for residential customers who have experienced a change in financial circumstances due to the COVID-19 pandemic. The law expires on March 31, 2021. For the three and six months ended June 30, 2020, the estimated foregone revenues that were not collected by the Utilities were approximately $20 million and $23 million , respectively, for CECONY and $1.2 million and $1.4 million , respectively, for O&R . See Note K to the Second Quarter Financial Statements. Also in March 2020, the Utilities requested and the NYSPSC granted extensions to file their 2019 Earnings Adjustment Mechanisms (EAMs) reports, which were filed in July 2020. The earned EAM incentives of approximately $46 million and $3 million for CECONY and O&R, respectively, are expected to be recovered from customers over a twelve-month period beginning September 2020. As of June 30, 2020, CECONY deferred, for New York City residential customers, $9 million of higher summer generation capacity supply costs. CECONY estimates that a total of $58 million of higher supply costs will be deferred and expects to recover such costs from November 2020 through April 2021. Also in June 2020, the NYSPSC directed CECONY to implement a summer cooling credit program to help mitigate the cost of staying home and running air conditioning for health-vulnerable low-income customers due to the limited availability of public cooling facilities as a result of the COVID-19 social distancing measures. The NYSPSC further ordered that the estimated $70.6 million cost of the program will be recovered over five years, beginning in January 2021. In June 2020, the NYSPSC established a generic proceeding on the impacts of the COVID-19 pandemic and sought comment on a variety of COVID-19 related issues. In July 2020, the Utilities submitted joint comments with other large utilities in New York State that included a formal request to defer all COVID-19 related costs and for a surcharge mechanism to collect such deferrals based upon the individual utility's need. The Utilities’ rate plans have revenue decoupling mechanisms in their New York electric and gas businesses that reconcile actual energy delivery revenues to the authorized delivery revenues approved by the NYSPSC per month and accumulate the deferred balances semi-annually under CECONY's electric rate plan (January through June and July through December, respectively) and annually under CECONY's gas rate plan and O&R New York's electric and gas rate plans (January through December). Differences are accrued with interest each month for CECONY and O&R New York’s electric customers and after the annual deferral period ends for CECONY and O&R New York’s gas customers for refund to, or recovery from customers, as applicable. Generally, the refund to or recovery from customers begins August and February of each year over an ensuing six-month period for CECONY's electric customers and February of each year over an ensuing twelve-month period for CECONY's gas and O&R New York's electric and gas customers. New Jersey State Regulation In March 2020, New Jersey Governor Murphy declared a Public Health Emergency and State of Emergency for the State of New Jersey. Since that declaration, the NJBPU and RECO have mitigated the potential impact of the COVID-19 pandemic on RECO, its customers and other stakeholders. New Jersey designated utilities, including RECO, as essential businesses that were able to continue a portion of their work. RECO modified or suspended certain work in the state. In March 2020, RECO began suspending late payment charges, terminations for non-payment, and no access fees during the COVID-19 pandemic. The suspension of these fees is not expected to be material. In July 2020, the NJBPU authorized RECO and other New Jersey utilities to create a COVID-19-related regulatory asset by deferring prudently incurred incremental costs related to COVID-19 beginning on March 9, 2020, and through the later of September 30, 2021, or 60 days after the emergency declaration is no longer in effect. As of June 30, 2020, RECO had not yet deferred any incremental costs related to COVID-19 and such costs are not expected to be material. Federal Regulation In March 2020, the North American Electric Reliability Corporation (NERC) issued guidance that the effects of the COVID-19 pandemic will be considered an acceptable basis for non-compliance with certain NERC Reliability Standards requirements that would have required action between March 1, 2020 and July 31, 2020. In addition, it suspended on-site NERC compliance audits until at least July 31, 2020. Also in March 2020, FERC announced several actions to ease regulatory obligations in response to the COVID-19 pandemic. These include postponement of certain filing deadlines and the suspension of all audit site visits and investigative testimony. In April 2020, FERC announced it would expeditiously review and act on requests for relief in response to the COVID-19 pandemic, give priority to processing filings that contribute to the business continuity of regulated entities’ energy infrastructure and exercise prosecutorial discretion when addressing events arising during the COVID-19 pandemic. FERC also approved a blanket waiver of requirements in Open Access Transmission Tariffs that require entities to hold meetings in-person and to provide or obtain notarized documents. Gas Safety In March 2020, the U.S. Department of Transportation’s Pipeline and Hazardous Materials Safety Administration (PHMSA) issued a notice staying enforcement of certain federal operator qualification, control room management and drug testing requirements during the COVID-19 pandemic. The notice also announced that PHMSA would exercise discretion in its overall enforcement of other parts of the pipeline safety regulations. The NYSPSC also provided guidance that it was staying enforcement of many of the same pipeline safety requirements identified in the March 2020 PHMSA notice. In April 2020, the NYSPSC issued an order that extended the deadlines to complete certain gas inspections by all New York gas utilities, including CECONY and O&R, from April 1, 2020 to August 1, 2020. Other Regulatory Matters 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, under its electric rate plan that was approved in January 2020, is amortizing its TCJA net benefits prior to January 1, 2019 allocable to its electric customers ( $377 million ) over a three -year period, the “protected” portion of its net regulatory liability for future income taxes related to certain accelerated tax depreciation benefits allocable to its electric customers ( $1,663 million ) over the remaining lives of the related assets and the remainder, or “unprotected” portion of the net regulatory liability allocable to its electric customers ( $784 million ) over a five -year period. CECONY, under its gas rate plan that was approved in January 2020, is amortizing its remaining TCJA net benefits prior to January 1, 2019 allocable to its gas customers ( $63 million ) over a two -year period, the protected portion of its net regulatory liability for future income taxes allocable to its gas customers ( $725 million ) over the remaining lives of the related assets and the unprotected portion of the net regulatory liability allocable to its gas customers ( $107 million ) over a five -year period. CECONY's net benefits prior to October 1, 2018 allocable to the company’s steam customers ( $15 million ) are being 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 steam customers ( $185 million ) is being amortized over the remaining lives of the related assets (with the amortization period for the unprotected portion subject to review in its next steam rate proceeding). O&R, under its current electric and gas rate plans, has reflected its TCJA net benefits in its electric and gas rates beginning as of January 1, 2019. Under the rate plans, O&R is amortizing its net benefits prior to January 1, 2019 ( $22 million ) over a three -year period, the protected portion of its net regulatory liability for future income taxes ( $123 million ) over the remaining lives of the related assets and the unprotected portion ( $30 million ) over a fifteen -year period. 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, 2020 , 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, 2020 , 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, 2020 , 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. In February 2020, RECO began recovering its deferred storm costs over a four -year period in accordance with its New Jersey 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. In July 2020, CECONY, O&R and NYSPSC Staff executed a settlement agreement, subject to NYSPSC approval, that resolves this matter. At June 30, 2020 , CECONY and O&R accrued $5.6 million and $0.85 million , respectively, for the benefit of electric customers related to this matter. In July 2018, the NYSPSC commenced an investigation into the rupture of a CECONY steam main located on Fifth Avenue and 21st Street in Manhattan. 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, 2020 , with respect to the incident, the company incurred operating costs of $17 million for property damage, clean-up and other response costs and invested $9 million in capital and retirement costs. At June 30, 2020 , the company accrued $3 million to an Other current liabilities account related to this matter . 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. At December 31, 2019, the company had an accrued regulatory liability related to this matter of $10 million , and at March 31, 2020, the company accrued an additional regulatory liability of $5 million . In April 2020, the NYSPSC approved a $15 million settlement agreement for the benefit of CECONY’s gas customers between CECONY and NYSPSC staff 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. Pursuant to the major outage reliability performance provisions of its electric rate plan, as a result of the July 13, 2019 power outage, CECONY recorded a $5 million negative revenue adjustment. The NYSPSC is also investigating other CECONY power outages that occurred in July 2019, primarily in the Flatbush area of Brooklyn. Primarily due to these outages, pursuant to the rate plan’s annual non-network outage frequency and non-network outage duration reliability performance provisions, the company recorded a $10 million negative revenue adjustment at December 31, 2019. The company is unable to estimate the amount or range of its possible additional loss related to these power outages. In May 2020, an executive order was issued prohibiting the acquisition, importation, transfer or installation of certain bulk-power system electric equipment that is sourced from foreign adversaries. The scope and effect will be determined by regulations to be issued pursuant to the order. The Companies are unable to predict the impact on them of such regulations. In August 2020, Tropical Storm Isaias caused significant damage to the Utilities’ electric distribution system and interrupted service to approximately 300,000 CECONY electric customers and approximately 225,000 O&R electric customers. To restore service to their customers and repair their energy systems, the Utilities are incurring operating costs and making capital expenditures, the amount of which the Utilities are unable to estimate at this time. The Utilities’ rate plans provide for operating costs and capital expenditures under different provisions. The Utilities expect that most of their operating expenses attributable to Tropical Storm Isaias will be deferred for recovery as a regulatory asset under their electric rate plans. The Utilities’ capital expenditures, up to specified levels, are reflected in rates under their rate plans. The Utilities’ New York electric rate plans include provisions for revenue decoupling, as a result of which delivery revenues generally are not affected by changes in delivery volumes from levels assumed when rates were approved. The provisions of the Utilities’ New York electric rate plans that impose penalties for operating performance provide for exceptions for major storms and catastrophic events beyond the control of the companies, including natural disasters such as hurricanes and floods. In August 2020, New York State Governor Cuomo directed the New York State Department of Public Service to investigate the preparation and performance of New York utilities in connection with Tropical Storm Isaias. The Companies are unable to estimate the amount or range of their possible loss in connection with the storm. Regulatory Assets and Liabilities Regulatory assets and liabilities at June 30, 2020 and December 31, 2019 were comprised of the following items: Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Regulatory assets Unrecognized pension and other postretirement costs $2,072 $2,541 $1,947 $2,403 Environmental remediation costs 729 732 648 647 Revenue taxes 336 321 322 308 Property tax reconciliation 235 219 230 210 Pension and other postretirement benefits deferrals 229 71 196 47 MTA power reliability deferral 212 248 212 248 Deferred derivative losses 142 83 133 76 System peak reduction and energy efficiency programs 103 131 102 130 Municipal infrastructure support costs 72 75 72 75 Deferred storm costs 70 77 — — Brooklyn Queens demand management program 37 39 37 39 Meadowlands heater odorization project 34 35 34 35 Gate station upgrade project 28 19 28 19 Unamortized loss on reacquired debt 24 28 22 26 Recoverable REV demonstration project costs 23 21 21 19 Preferred stock redemption 22 22 22 22 Non-wire alternative projects 14 14 14 14 Workers’ compensation — 3 — 3 Other 224 180 212 166 Regulatory assets – noncurrent 4,606 4,859 4,252 4,487 Deferred derivative losses 106 128 93 113 Recoverable energy costs 11 — 4 — Regulatory assets – current 117 128 97 113 Total Regulatory Assets $4,723 $4,987 $4,349 $4,600 Regulatory liabilities Future income tax $2,323 $2,426 $2,175 $2,275 Allowance for cost of removal less salvage 1,035 989 884 843 TCJA net benefits* 379 471 366 454 Net proceeds from sale of property 159 173 159 173 Net unbilled revenue deferrals 155 199 155 199 Energy efficiency portfolio standard unencumbered funds 88 122 85 118 Pension and other postretirement benefit deferrals 72 75 40 46 System benefit charge carrying charge 56 48 50 44 Property tax refunds 38 45 38 45 Unrecognized other postretirement costs 33 9 — — BQDM and REV Demo reconciliations 26 27 25 26 Settlement of gas proceedings 22 10 22 10 Sales and use tax refunds 18 8 18 8 Earnings sharing - electric, gas and steam 17 22 10 15 Settlement of prudence proceeding 7 8 7 8 Other 224 195 188 163 Regulatory liabilities – noncurrent 4,652 4,827 4,222 4,427 Refundable energy costs 31 44 8 12 Deferred derivative gains 32 34 31 34 Revenue decoupling mechanism — 24 — 17 Regulatory liabilities – current 63 102 39 63 Total Regulatory Liabilities $4,715 $4,929 $4,261 $4,490 * See "Other Regulatory Matters," above.

Capitalization

Capitalization	6 Months Ended
Capitalization	Jun. 30, 2020
Debt Disclosure [Abstract]
Capitalization	Capitalization In January 2020, Con Edison issued 1,050,000 shares of its common stock for $88 million upon physical settlement of the remaining shares subject to its May 2019 forward sale agreement. In March 2020, CECONY issued $600 million aggregate principal amount of 3.35 percent debentures, due 2030 and $1,000 million aggregate principal amount of 3.95 percent debentures, due 2050. The carrying amounts and fair values of long-term debt at June 30, 2020 and December 31, 2019 were: (Millions of Dollars) 2020 2019 Long-Term Debt (including current portion) (a) Carrying Amount Fair Value Carrying Amount Fair Value Con Edison $21,114 $25,183 $19,973 $22,738 CECONY $16,194 $20,001 $14,964 $17,505 (a) Amounts shown are net of unamortized debt expense and unamortized debt discount of $196 million and $170 million for Con Edison and CECONY, respectively, as of June 30, 2020 and $178 million and $151 million for Con Edison and CECONY, respectively, as of December 31, 2019 . The fair values of the Companies' long-term debt have been estimated primarily using available market information and at June 30, 2020 are classified as Level 2 (see Note N). 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 non-recourse project debt that was included in long-term debt to long-term debt due within one year. At December 31, 2019 , long-term debt due within one year included $1,001 million of PG&E-related project debt. At June 30, 2020, due to the likelihood of PG&E’s plan of reorganization becoming effective, the company’s PG&E-related non-recourse project debt with a maturity longer than one year ( $898 million ) was reclassified from long-term debt due within one year to long-term debt . In July 2020, PG&E’s plan of reorganization became effective, and PG&E assumed all of the PG&E PPAs.

Short-Term Borrowing

Short-Term Borrowing	6 Months Ended
Short-Term Borrowing	Jun. 30, 2020
Debt Disclosure [Abstract]
Short-Term Borrowing	Short-Term Borrowing At June 30, 2020 , Con Edison had $1,813 million of commercial paper outstanding of which $1,115 million was outstanding under CECONY’s program. The weighted average interest rate at June 30, 2020 was 0.2 percent for both Con Edison and CECONY. At December 31, 2019 , Con Edison had $1,692 million of commercial paper outstanding of which $1,137 million was outstanding under CECONY’s program. The weighted average interest rate at December 31, 2019 was 2.0 percent for both Con Edison and CECONY. At June 30, 2020 and December 31, 2019 , 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, 2020 and December 31, 2019 . In July 2020, Con Edison borrowed $820 million pursuant to an April 2020 credit agreement that was amended in June 2020 (as amended, the Supplemental Credit Agreement). Con Edison used the proceeds from the borrowing for general corporate purposes, including repayment of short-term debt bearing interest at variable rates. Pursuant to the Supplemental Credit Agreement, the borrowing bears interest at a variable rate and was converted to a term loan that matures on March 29, 2021 (the “Term Loan”). Con Edison has the option to prepay the Term Loan. Subject to certain exceptions, the Term Loan under the Supplemental Credit Agreement is subject to mandatory prepayment with the net cash proceeds of debt or equity issuances by Con Edison or its non-regulated subsidiaries. Pursuant to the Supplemental Credit Agreement, upon a change of control of, or upon an event of default by Con Edison, the lenders may declare the Term Loan immediately due and payable. Events of Default include Con Edison exceeding at any time a ratio of consolidated debt to consolidated total capital of 0.65 to 1; having liens on its assets in an aggregate amount exceeding five percent of its consolidated total capital, subject to certain exceptions; Con Edison or any of its subsidiaries failing to make one or more payments in respect of other material financial obligations (in excess of an aggregate $150 million of debt or derivative obligations other than non-recourse debt) when due or within any applicable grace period; the occurrence of an event or condition which results in the acceleration of the maturity of any material debt (in excess of an aggregate $150 million

Pension Benefits

Pension Benefits	6 Months Ended
Pension Benefits	Jun. 30, 2020
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, 2020 and 2019 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Service cost – including administrative expenses $73 $62 $69 $58 Interest cost on projected benefit obligation 137 150 129 141 Expected return on plan assets (258) (247) (245) (234) Recognition of net actuarial loss 175 130 165 123 Recognition of prior service credit (4) (4) (5) (5) TOTAL PERIODIC BENEFIT COST $123 $91 $113 $83 Cost capitalized (33) (29) (32) (27) Reconciliation to rate level (62) (2) (59) (1) Total expense recognized $28 $60 $22 $55 For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Service cost – including administrative expenses $147 $125 $137 $117 Interest cost on projected benefit obligation 275 301 258 282 Expected return on plan assets (517) (494) (490) (468) Recognition of net actuarial loss 349 259 331 246 Recognition of prior service credit (8) (9) (10) (10) TOTAL PERIODIC BENEFIT COST $246 $182 $226 $167 Cost capitalized (64) (55) (61) (52) Reconciliation to rate level (126) (7) (121) (6) Total expense recognized $56 $120 $44 $109 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, 2020 , Con Edison and CECONY expect to make contributions to the pension plans during 2020 of $474 million (of which $434 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 2020, the Companies contributed $79 million to the pension plans, of which $78 million was made by CECONY. CECONY also contributed $18 million to the external trust for its non-qualified supplemental plan.

Environmental Matters

Environmental Matters	6 Months Ended
Environmental Matters	Jun. 30, 2020
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, 2020 and December 31, 2019 were as follows: Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Accrued Liabilities: Manufactured gas plant sites $633 $640 $554 $561 Other Superfund Sites 101 94 100 93 Total $734 $734 $654 $654 Regulatory assets $729 $732 $648 $647 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, 2020 and 2019 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Remediation costs incurred $3 $8 $3 $6 For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Remediation costs incurred $8 $11 $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, 2020 and 2019 . In 2019, 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, 2020 , 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, 2020 and December 31, 2019 were as follows: Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Accrued liability – asbestos suits $8 $8 $7 $7 Regulatory assets – asbestos suits $8 $8 $7 $7 Accrued liability – workers’ compensation $75 $78 $70 $73 Regulatory assets – workers’ compensation $— $3 $— $3

Other Material Contingencies

Other Material Contingencies	6 Months Ended
Other Material Contingencies	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Other Material Contingencies	10 years Total (Millions of Dollars) Con Edison Transmission $362 $186 $— $548 Energy transactions 447 48 233 728 Renewable electric production projects 207 9 382 598 Other 70 — — 70 Total $1,086 $243 $615 $1,944 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 amounts 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. 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 and the Clean Energy Businesses 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 in guarantees provided by Con Edison to Travelers Insurance Company for indemnity agreements for surety bonds in connection with operation of solar energy facilities and energy service projects of the Clean Energy Businesses." 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, 2020 , the company had not accrued a liability for damages 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 $1,944 million and $1,831 million at June 30, 2020 and December 31, 2019 , respectively. A summary, by type and term, of Con Edison’s total guarantees under these agreements at June 30, 2020 is as follows: Guarantee Type 0 – 3 years 4 – 10 years > 10 years Total (Millions of Dollars) Con Edison Transmission $362 $186 $— $548 Energy transactions 447 48 233 728 Renewable electric production projects 207 9 382 598 Other 70 — — 70 Total $1,086 $243 $615 $1,944 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 amounts 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. 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 and the Clean Energy Businesses 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 in guarantees provided by Con Edison to Travelers Insurance Company for indemnity agreements for surety bonds in connection with operation of solar energy facilities and energy service projects of the Clean Energy Businesses.

Leases

Leases	6 Months Ended
Leases	Jun. 30, 2020
Leases [Abstract]
Leases	Leases Operating lease cost and cash paid for amounts included in the measurement of lease liabilities for the three and six months ended June 30, 2020 and 2019 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Operating lease cost $21 $21 $16 $16 Operating lease cash flows $8 $9 $4 $4 For the Six Months Ended June 30, 2020 Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Operating lease cost $42 $41 $32 $32 Operating lease cash flows $16 $17 $8 $8 As of June 30, 2020 , assets recorded as finance leases were $3 million for Con Edison and $2 million for CECONY, and the accumulated amortization associated with finance leases for Con Edison and CECONY were $3 million and $1 million , respectively. As of December 31, 2019 , assets recorded as finance leases were $1 million for Con Edison and an immaterial amount for CECONY, 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, 2020 and 2019 , finance lease costs and cash flows for Con Edison and CECONY were immaterial. Right-of-use assets obtained in exchange for operating lease obligations for Con Edison and CECONY were $5 million and $1 million , respectively, for the three and six months ended June 30, 2020 . Other information related to leases for Con Edison and CECONY at June 30, 2020 and December 31, 2019 were as follows: Con Edison CECONY 2020 2019 2020 2019 Weighted Average Remaining Lease Term: Operating leases 19.2 years 19.8 years 13.5 years 14.0 years Finance leases 7.5 years 12.2 years 4.4 years 2.4 years Weighted Average Discount Rate: Operating leases 4.3% 4.3% 3.6% 3.6% Finance leases 1.8% 3.5% 1.4% 4.1% Future minimum lease payments under non-cancellable leases at June 30, 2020 were as follows: (Millions of Dollars) Con Edison CECONY Year Ending June 30, Operating Leases Finance Leases Operating Leases Finance Leases 2021 $80 $1 $60 $1 2022 76 1 57 1 2023 73 — 56 — 2024 73 — 56 — 2025 74 — 57 — All years thereafter 993 1 504 — Total future minimum lease payments $1,369 $3 $790 $2 Less: imputed interest (475) — (167) — Total $894 $3 $623 $2 Reported as of June 30, 2020 Operating lease liabilities (current) $83 $— $64 $— Operating lease liabilities (noncurrent) 811 — 559 — Other current liabilities — 1 — 1 Other noncurrent liabilities — 2 — 1 Total $894 $3 $623 $2 At June 30, 2020 , the Companies did not have material obligations under operating or finance leases that had not yet commenced. 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, 2020 and 2019
Leases	Leases Operating lease cost and cash paid for amounts included in the measurement of lease liabilities for the three and six months ended June 30, 2020 and 2019 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Operating lease cost $21 $21 $16 $16 Operating lease cash flows $8 $9 $4 $4 For the Six Months Ended June 30, 2020 Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Operating lease cost $42 $41 $32 $32 Operating lease cash flows $16 $17 $8 $8 As of June 30, 2020 , assets recorded as finance leases were $3 million for Con Edison and $2 million for CECONY, and the accumulated amortization associated with finance leases for Con Edison and CECONY were $3 million and $1 million , respectively. As of December 31, 2019 , assets recorded as finance leases were $1 million for Con Edison and an immaterial amount for CECONY, 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, 2020 and 2019 , finance lease costs and cash flows for Con Edison and CECONY were immaterial. Right-of-use assets obtained in exchange for operating lease obligations for Con Edison and CECONY were $5 million and $1 million , respectively, for the three and six months ended June 30, 2020 . Other information related to leases for Con Edison and CECONY at June 30, 2020 and December 31, 2019 were as follows: Con Edison CECONY 2020 2019 2020 2019 Weighted Average Remaining Lease Term: Operating leases 19.2 years 19.8 years 13.5 years 14.0 years Finance leases 7.5 years 12.2 years 4.4 years 2.4 years Weighted Average Discount Rate: Operating leases 4.3% 4.3% 3.6% 3.6% Finance leases 1.8% 3.5% 1.4% 4.1% Future minimum lease payments under non-cancellable leases at June 30, 2020 were as follows: (Millions of Dollars) Con Edison CECONY Year Ending June 30, Operating Leases Finance Leases Operating Leases Finance Leases 2021 $80 $1 $60 $1 2022 76 1 57 1 2023 73 — 56 — 2024 73 — 56 — 2025 74 — 57 — All years thereafter 993 1 504 — Total future minimum lease payments $1,369 $3 $790 $2 Less: imputed interest (475) — (167) — Total $894 $3 $623 $2 Reported as of June 30, 2020 Operating lease liabilities (current) $83 $— $64 $— Operating lease liabilities (noncurrent) 811 — 559 — Other current liabilities — 1 — 1 Other noncurrent liabilities — 2 — 1 Total $894 $3 $623 $2 At June 30, 2020 , the Companies did not have material obligations under operating or finance leases that had not yet commenced. 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, 2020 and 2019

Income Tax

Income Tax	6 Months Ended
Income Tax	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Tax	Income Tax In response to the economic impacts of the COVID-19 pandemic, the Coronavirus Aid, Relief, and Economic Security Act (CARES Act) was signed into law on March 27, 2020. The CARES Act provides relief to corporate taxpayers by permitting a five-year carryback of net operating losses (NOLs) for tax years 2018, 2019 and 2020, removing the 80 percent limitation when applying the NOLs to carryback years, increasing the 30 percent limitation on interest deductibility to 50 percent of adjusted taxable income for tax years 2019 and 2020, and provides for certain employment tax credits and refunds for eligible employers. Under the CARES Act, Con Edison will carryback its $29 million NOL from tax year 2018 to tax year 2013 generating a $2.5 million net tax refund for which a tax receivable was established in the first quarter of 2020. In addition, Con Edison recognized a discrete income tax benefit of $4 million in the first quarter of 2020, due to the higher federal statutory tax rate in 2013. The 2018 federal NOL was recorded at 21 percent and will be carried back to tax year 2013, which had a 35 percent federal statutory tax rate. This tax benefit was primarily recognized at the Clean Energy Businesses. Con Edison’s income tax expense decreased to $9 million for the three months ended June 30, 2020 from $19 million for the three months ended June 30, 2019 . The decrease in income tax expense is primarily due to an increase in the amortization of excess deferred federal income taxes due to CECONY’s new rate plan beginning in the first quarter of 2020, offset in part by higher income before income tax expense, the absence of the amortization of excess deferred state income taxes, higher state income taxes and higher allowance for uncollectible accounts. CECONY’s income tax expense decreased to $7 million for the three months ended June 30, 2020 from $27 million for the three months ended June 30, 2019 . The decrease in income tax expense is primarily due to lower income before income tax expense and an increase in the amortization of excess deferred federal income taxes due to CECONY’s new rate plan beginning in the first quarter of 2020, offset in part by the absence of the amortization of excess deferred state income taxes and higher allowance for uncollectible accounts. 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, 2020 and 2019 is as follows: Con Edison CECONY (% of Pre-tax income) 2020 2019 2020 2019 STATUTORY TAX RATE Federal 21 % 21 % 21 % 21 % Changes in computed taxes resulting from: State income tax 6 6 6 5 Amortization of excess deferred federal income taxes (20 ) (9 ) (25 ) (9 ) Taxes attributable to non-controlling interest (2 ) (4 ) — — Cost of removal 4 2 5 2 Other plant-related items (3 ) (1 ) (4 ) (1 ) Allowance for uncollectible accounts 1 — 1 — Renewable energy credits (4 ) (4 ) — — Amortization of excess deferred state income taxes — (2 ) — (2 ) Other 1 1 — (1 ) Effective tax rate 4 % 10 % 4 % 15 % Con Edison’s income tax expense decreased to $64 million for the six months ended June 30, 2020 from $127 million for the six months ended June 30, 2019 . The decrease in income tax expense is primarily due to lower income before income tax expense, an increase in the amortization of excess deferred federal income taxes due to CECONY’s new rate plan beginning in the first quarter of 2020, higher renewable energy credits and a $4 million income tax benefit due to the ability to carryback a net operating loss from the 2018 tax year to the 2013 tax year as allowed under the CARES Act, offset in part by the absence of the amortization of excess deferred state income taxes and higher allowance for uncollectible accounts. CECONY’s income tax expense decreased to $102 million for the six months ended June 30, 2020 from $151 million for the six months ended June 30, 2019 . The decrease in income tax expense is primarily due to lower income before income tax expense, lower state income taxes and an increase in the amortization of excess deferred federal income taxes due to CECONY’s new rate plan beginning in the first quarter of 2020, offset in part by the absence of the amortization of excess deferred state income taxes and higher allowance for uncollectible accounts. 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, 2020 and 2019 is as follows: Con Edison CECONY (% of Pre-tax income) 2020 2019 2020 2019 STATUTORY TAX RATE Federal 21 % 21 % 21 % 21 % Changes in computed taxes resulting from: State income tax 5 5 5 5 Amortization of excess deferred federal income taxes (12 ) (4 ) (12 ) (4 ) Taxes attributable to non-controlling interest (1 ) (1 ) — — Cost of removal 2 1 2 1 Other plant-related items (2 ) (1 ) (2 ) — Renewable energy credits (3 ) (2 ) — — CARES Act NOL carryback (1 ) — — — Amortization of excess deferred state income taxes — (1 ) — (1 ) Other 1 (1 ) 1 (1 ) Effective tax rate 10 % 17 % 15 % 21 % CECONY deferred as regulatory liabilities its estimated net benefits for its electric service under the TCJA for the six months ended June 30, 2019. 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. Under CECONY’s new electric rate plan that began in the first quarter of 2020, the deferral of its net benefits for its electric service ceased and is included in its new rates. Additionally, the amortization of the unprotected excess deferred federal income taxes for its electric and gas services is being amortized over a five -year period, which increased the tax benefit in the first six months of 2020. Uncertain Tax Positions At June 30, 2020 , the estimated liability for uncertain tax positions for Con Edison was $13 million ( $3 million for CECONY). Con Edison reasonably expects to resolve within the next twelve months approximately $1 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 immaterial. The total amount of unrecognized tax benefits, if recognized, that would reduce Con Edison’s effective tax rate is $13 million ( $12 million , net of federal taxes) with $3 million attributable to CECONY. 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 six months ended June 30, 2020 , the Companies recognized an immaterial amount of interest expense and no penalties for uncertain tax positions in their consolidated income statements. At June 30, 2020 and December 31, 2019 , the Companies recognized an immaterial amount of accrued interest on their consolidated balance sheets.

Revenue Recognition

Revenue Recognition	6 Months Ended
Revenue Recognition	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition The following table presents, for the three and six months ended June 30, 2020 and 2019 , revenue from contracts with customers as defined in 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, 2020 For the Three Months Ended June 30, 2019 (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 $1,781 $64 $1,845 $1,751 $82 $1,833 Gas 399 17 416 400 8 408 Steam 81 3 84 86 4 90 Total CECONY $2,261 $84 $2,345 $2,237 $94 $2,331 O&R Electric 139 (1) 138 140 (2) 138 Gas 37 — 37 39 2 41 Total O&R $176 $(1) $175 $179 $— $179 Clean Energy Businesses Renewables 178 (b) — 178 171 (b) — 171 Energy services 11 — 11 16 — 16 Other — 9 9 — 46 46 Total Clean Energy Businesses $189 $9 $198 $187 $46 $233 Con Edison Transmission 1 — 1 1 — 1 Total Con Edison $2,627 $92 $2,719 $2,604 $140 $2,744 (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 $2 million and $4 million for the three months ended June 30, 2020 and 2019 , respectively, of revenue related to engineering, procurement and construction services. For the Six Months Ended June 30, 2020 For the Six Months Ended June 30, 2019 (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 $3,514 $102 $3,616 $3,465 $165 $3,630 Gas 1,232 18 1,250 1,310 20 1,330 Steam 325 9 334 402 9 411 Total CECONY $5,071 $129 $5,200 $5,177 $194 $5,371 O&R Electric 267 7 274 283 — 283 Gas 130 4 134 153 1 154 Total O&R $397 $11 $408 $436 $1 $437 Clean Energy Businesses Renewables 292 (b) — 292 278 (b) — 278 Energy services 22 — 22 39 — 39 Other — 30 30 — 133 133 Total Clean Energy Businesses $314 $30 $344 $317 $133 $450 Con Edison Transmission 2 — 2 2 — 2 Other (c) — (1) (1) — (2) (2) Total Con Edison $5,784 $169 $5,953 $5,932 $326 $6,258 (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 $6 million for the six months ended June 30, 2020 and 2019 , respectively, of revenue related to engineering, procurement and construction services. (c) P arent company and consolidation adjustments. 2020 2019 (Millions of Dollars) Unbilled contract revenue (a) Unearned revenue (b) Unbilled contract revenue (a) Unearned revenue (b) Beginning balance as of January 1, $29 $17 $29 $20 Additions (c) 58 31 44 — Subtractions (c) 65 1 (d) 38 2 (d) Ending balance as of June 30, $22 $47 $35 $18 (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, $1 million and $2 million were included in the balances as of January 1, 2020 and 2019 , respectively. As of June 30, 2020 , the aggregate amount of the remaining fixed performance obligations of the Clean Energy Businesses under contracts with customers for energy services is $70 million , of which $34 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. In March 2020, the Utilities began suspending new late payment charges and certain other fees for all customers. The estimated amount of these foregone revenues for the three months ended June 30, 2020 was $21 million and $20 million for Con Edison and CECONY, respectively. The estimated amount of these foregone revenues for the six months ended June 30, 2020 was $24 million and $23 million for Con Edison and CECONY, respectively. The Utilities also began providing payment extensions for all customers that were scheduled to be disconnected prior to the start of the COVID-19 pandemic. See "COVID-19 Regulatory Matters" in Note B.

Financial Information by Busine

Financial Information by Business Segment	6 Months Ended
Financial Information by Business Segment	Jun. 30, 2020
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, 2020 and 2019 were as follows: For the Three Months Ended June 30, Operating Inter-segment Depreciation and Operating (Millions of Dollars) 2020 2019 2020 2019 2020 2019 2020 2019 CECONY Electric $1,845 $1,833 $4 $5 $301 $261 $318 $314 Gas 416 408 2 2 72 56 105 94 Steam 84 90 19 16 23 22 (34) (32) Consolidation adjustments — — (25) (23) — — — — Total CECONY $2,345 $2,331 $— $— $396 $339 $389 $376 O&R Electric $138 $138 $— $— $16 $15 $13 $16 Gas 37 41 — — 7 6 (3) (3) Total O&R $175 $179 $— $— $23 $21 $10 $13 Clean Energy Businesses $198 $233 $— $— $57 $58 $82 $72 Con Edison Transmission 1 1 — — — — (1) (2) Other (a) — — — — — — (1) (1) Total Con Edison $2,719 $2,744 $— $— $476 $418 $479 $458 (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) 2020 2019 2020 2019 2020 2019 2020 2019 CECONY Electric $3,616 $3,630 $9 $9 $598 $518 $600 $571 Gas 1,250 1,330 3 3 143 111 474 438 Steam 334 411 38 35 45 44 58 92 Consolidation adjustments — — (50) (47) — — — — Total CECONY $5,200 $5,371 $— $— $786 $673 $1,132 $1,101 O&R Electric $274 $283 $— $— $32 $30 $27 $31 Gas 134 154 — — 13 12 38 36 Total O&R $408 $437 $— $— $45 $42 $65 $67 Clean Energy Businesses $344 $450 $— $— $115 $116 $96 $83 Con Edison Transmission 2 2 — — — — (3) (3) Other (a) (1) (2) — — — — (3) (4) Total Con Edison $5,953 $6,258 $— $— $946 $831 $1,287 $1,244 (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
Derivative Instruments and Hedging Activities	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities Con Edison’s subsidiaries 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. These are economic hedges, for which the Utilities and the Clean Energy Business do not elect hedge accounting. 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 N), 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. The fair values of the Companies’ derivatives including the offsetting of assets and liabilities on the consolidated balance sheet at June 30, 2020 and December 31, 2019 were: (Millions of Dollars) 2020 2019 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 $57 $32 $89 (b) $60 $(3) $57 (b) Noncurrent 15 (11) 4 19 (13) 6 (d) Total fair value of derivative assets $72 $21 $93 $79 $(16) $63 Fair value of derivative liabilities Current $(137) $(33) $(170) (c) $(140) $17 $(123) (d) Noncurrent (255) 13 (242) (c) (122) 16 (106) (d) Total fair value of derivative liabilities $(392) $(20) $(412) $(262) $33 $(229) Net fair value derivative assets/(liabilities) $(320) $1 $(319) $(183) $17 $(166) CECONY Fair value of derivative assets Current $41 $(22) $19 (b) $39 $(6) $33 (b) Noncurrent 13 (9) 4 17 (12) 5 Total fair value of derivative assets $54 $(31) $23 $56 $(18) $38 Fair value of derivative liabilities Current $(93) $24 $(69) $(100) $19 $(81) Noncurrent (138) 10 (128) (80) 16 (64) Total fair value of derivative liabilities $(231) $34 $(197) $(180) $35 $(145) Net fair value derivative assets/(liabilities) $(177) $3 $(174) $(124) $17 $(107) (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, 2020 and December 31, 2019 , margin deposits for Con Edison ( $7 million and $9 million , respectively) and CECONY ( $6 million and $8 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 $(21) million in current liabilities and $(108) million in noncurrent liabilities. At June 30, 2020 , the Clean Energy Businesses had interest rate swaps with notional amounts of $892 million . The expiration dates of the swaps range from 2024-2041. (d) Includes amounts for interest rate swaps of $1 million in noncurrent assets, $(7) million in current liabilities and $(34) million in noncurrent liabilities. At December 31, 2019 , the Clean Energy Businesses had interest rate swaps with notional amounts of $919 million . The expiration dates of the swaps range from 2024-2041. 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 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, 2020 and 2019 : For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) Balance Sheet Location 2020 2019 2020 2019 Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: Current Deferred derivative gains $(2) $(16) $(2) $(15) Noncurrent Deferred derivative gains (6) (2) (6) — Total deferred gains/(losses) $(8) $(18) $(8) $(15) Current Deferred derivative losses $36 $(36) $32 $(34) Current Recoverable energy costs (45) (41) (40) (37) Noncurrent Deferred derivative losses (13) (74) (15) (68) Total deferred gains/(losses) $(22) $(151) $(23) $(139) Net deferred gains/(losses) $(30) $(169) $(31) $(154) Income Statement Location Pre-tax gains/(losses) recognized in income Non-utility revenue $1 $7 $— $— Other operations and maintenance expense 2 — 2 — Other interest expense (4) (24) — — Total pre-tax gains/(losses) recognized in income $(1) $(17) $2 $— For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) Balance Sheet Location 2020 2019 2020 2019 Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: Current Deferred derivative gains $(3) $(12) $(3) $(11) Noncurrent Deferred derivative gains (3) (8) (3) (6) Total deferred gains/(losses) $(6) $(20) $(6) $(17) Current Deferred derivative losses $22 $(39) $20 $(34) Current Recoverable energy costs (140) (59) (126) (51) Noncurrent Deferred derivative losses (58) (100) (58) (95) Total deferred gains/(losses) $(176) $(198) $(164) $(180) Net deferred gains/(losses) $(182) $(218) $(170) $(197) Income Statement Location Pre-tax gains/(losses) recognized in income Gas purchased for resale $(3) $(2) $— $— Non-utility revenue 5 15 — — Other operations and maintenance expense (5) 1 (5) 1 Other interest expense (89) (34) — — Total pre-tax gains/(losses) recognized in income $(92) $(20) $(5) $1 The following table presents the hedged volume of Con Edison’s and CECONY’s commodity derivative transactions at June 30, 2020 : Electric Energy (MWh) (a)(b) Capacity (MW) (a) Natural Gas (Dt) (a)(b) Refined Fuels (gallons) Con Edison 33,140,975 39,561 286,817,088 9,744,000 CECONY 30,767,675 33,900 268,660,000 9,744,000 (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, 2020 , Con Edison and CECONY had $222 million and $19 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 $94 million with independent system operators, $57 million with non-investment grade/non-rated counterparties, $57 million with investment-grade counterparties and $14 million with commodity exchange brokers. CECONY’s net credit exposure consisted of $10 million with commodity exchange brokers, $9 million with investment-grade counterparties and an immaterial amount with non-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, 2020 : (Millions of Dollars) Con Edison (a) CECONY (a) Aggregate fair value – net liabilities $195 $179 Collateral posted 123 111 Additional collateral (b) (downgrade one level from current ratings) 15 9 Additional collateral (b) (downgrade to below investment grade from current ratings) 84 (c) 67 (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 $20 million of additional collateral at June 30, 2020 . 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, 2020 , if Con Edison had been downgraded to below investment grade, it would have been required to post additional collateral for such derivative instruments of $37 million .

Fair Value Measurements

Fair Value Measurements	6 Months Ended
Fair Value Measurements	Jun. 30, 2020
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, 2020 and December 31, 2019 are summarized below. 2020 2019 (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) $14 $44 $2 $41 $101 $4 $61 $2 $4 $71 Interest rate swaps (a)(b)(c) — — — — — — 1 — — 1 Other (a)(b)(d) 375 116 — — 491 353 125 — — 478 Total assets $389 $160 $2 $41 $592 $357 $187 $2 $4 $550 Derivative liabilities: Commodity (a)(b)(c) $12 $221 $16 $33 $282 $18 $174 $18 $(22) $188 Interest rate swaps (a)(b)(c) — 130 — — 130 — 41 — — 41 Total liabilities $12 $351 $16 $33 $412 $18 $215 $18 $(22) $229 CECONY Derivative assets: Commodity (a)(b)(c) $11 $31 $1 $(15) $28 $3 $42 $1 $— $46 Other (a)(b)(d) 356 111 — — 467 333 119 — — 452 Total assets $367 $142 $1 $(15) $495 $336 $161 $1 $— $498 Derivative liabilities: Commodity (a)(b)(c) $10 $201 $8 $(22) $197 $15 $147 $7 $(24) $145 (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, 2020 . Con Edison and CECONY had $24 million and $22 million , respectively, of commodity derivative liabilities transferred from level 3 to level 2 during the year ended December 31, 2019 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, 2019 to less than three years as of December 31, 2019 . (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, 2020 and December 31, 2019 , 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, 2020 Valuation Techniques Unobservable Inputs Range (Millions of Dollars) Con Edison – Commodity Electricity $(1) Discounted Cash Flow Forward energy prices (a) $21.00 - $62.76 per MWh (14) Discounted Cash Flow Forward capacity prices (a) $0.30 - $8.75 per kW-month Transmission Congestion Contracts/Financial Transmission Rights 1 Discounted Cash Flow Inter-zonal forward price curves adjusted for historical zonal losses (b) $(24.58) - $46.10 per MWh Total Con Edison—Commodity $(14) CECONY – Commodity Electricity $(1) Discounted Cash Flow Forward energy prices (a) $23.02 - $62.76 per MWh (7) Discounted Cash Flow Forward capacity prices (a) $0.30 - $8.62 per kW-month Transmission Congestion Contracts 1 Discounted Cash Flow Inter-zonal forward price curves adjusted for historical zonal losses (b) $0.32 - $1.51 per MWh Total CECONY—Commodity $(7) (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, 2020 and 2019 and classified as Level 3 in the fair value hierarchy: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Beginning balance as of April 1, $(13) $(19) $(6) $(5) Included in earnings (2) — (1) 1 Included in regulatory assets and liabilities — (27) 1 (25) Settlements 1 — (1) (1) Ending balance as of June 30, $(14) $(46) $(7) $(30) For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Beginning balance as of January 1, $(16) $(13) $(6) $(2) Included in earnings (7) (4) (3) 1 Included in regulatory assets and liabilities 1 (31) (1) (28) Settlements 8 2 3 (1) Ending balance as of June 30, $(14) $(46) $(7) $(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 for both periods) on the consolidated income statement for the three months ended June 30, 2020 and 2019 . Realized and unrealized gains and losses on Level 3 commodity derivative assets and liabilities are reported in non-utility revenues ( $1 million gain and $1 million loss) on the consolidated income statement for the six months ended June 30, 2020 and 2019 . The change in fair value relating to Level 3 commodity derivative assets and liabilities held at June 30, 2020 and 2019 is included in non-utility revenues (immaterial for both periods) on the consolidated income statement for the three months ended June 30, 2020 and 2019 . For the six months ended June 30, 2020 and 2019 , the change in fair value relating to Level 3 commodity derivatives assets and liabilities is included in non-utility revenues ( $1 million gain and $1 million loss) on the consolidated income statement.

Variable Interest Entities

Variable Interest Entities	6 Months Ended
Variable Interest Entities	Jun. 30, 2020
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 2019, 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. Clean Energy Businesses In September 2019, the Clean Energy Businesses, which previously owned an 80 percent membership interest in OCI Solar San Antonio 4 LLC (Texas Solar 4), acquired the remaining 20 percent interest. As a result of the acquisition, Texas Solar 4 is a consolidated entity. Prior to the acquisition, Con Edison had a variable interest in Texas Solar 4, as to which Con Edison was the primary beneficiary since the power to direct the activities that most significantly impact the economics of Texas Solar 4 was held by the Clean Energy Businesses. 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 were immaterial. In December 2018, the Clean Energy Businesses 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 the Clean Energy Businesses. 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, 2020 , the hypothetical liquidation at book value (HLBV) method of accounting for the Tax Equity Projects resulted in $12 million of income ( $9 million , after tax) for the tax equity investor and $4 million of income ( $3 million , after tax) for Con Edison. For the three months ended June 30, 2019 , the 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 $15 million loss ( $12 million , after tax) for Con Edison. For the six months ended June 30, 2020 , the HLBV method of accounting for the Tax Equity Projects resulted in $29 million of income ( $22 million , after tax) for the tax equity investor and a $10 million loss ( $8 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. Con Edison has determined that the use of HLBV accounting is reasonable and appropriate to attribute income and loss to the tax equity investors. Using the HLBV method, the company's earnings from the projects are adjusted to reflect the income or loss allocable to the tax equity investors calculated based on how the project would allocate and distribute its cash if it were to sell all of its assets for their carrying amounts and liquidate at a particular point in time. Under the HLBV method, the company calculates the liquidation value allocable to the tax equity investors at the beginning and end of each period based on the contractual liquidation waterfall and adjusts its income for the period to reflect the change in the liquidation value allocable to the tax equity investors. At June 30, 2020 and December 31, 2019 , Con Edison’s consolidated balance sheet included the following amounts associated with its VIEs: Tax Equity Projects Great Valley Solar Copper Mountain - Mesquite Solar (Millions of Dollars) 2020 2019 2020 2019 Non-utility property, less accumulated depreciation (f)(g) $288 $293 $453 $461 Other assets 45 40 189 128 Total assets (a) $333 $333 $642 $589 Other liabilities 15 17 69 18 Total liabilities (b) $15 $17 $69 $18 (a) The assets of the Tax Equity Projects 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 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 $73 million and $62 million at June 30, 2020 and December 31, 2019 , 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 $140 million and $126 million at June 30, 2020 and December 31, 2019 , respectively. (f) Non-utility property is reduced by accumulated depreciation of $13 million for Great Valley Solar and $23 million for Copper Mountain - Mesquite Solar at June 30, 2020 . (g) Non-utility property is reduced by accumulated depreciation of $9 million for Great Valley Solar and $15 million for Copper Mountain - Mesquite Solar at December 31, 2019 .

New Financial Accounting Standa

New Financial Accounting Standards	6 Months Ended
New Financial Accounting Standards	Jun. 30, 2020
Accounting Changes and Error Corrections [Abstract]
New Financial Accounting Standards	New Financial Accounting Standards In December 2019, the FASB issued amendments to the guidance for income taxes through ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” The amendments in this update simplify the accounting for income taxes by removing certain exceptions such as: 1) the incremental approach for intraperiod tax allocation when there is a loss from continuing operations and income or a gain from other items, 2) the requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment, 3) the ability not to recognize a deferred tax liability for a foreign subsidiary when a foreign equity method investment becomes a subsidiary, and 4) the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. For public entities, the amendments are effective for reporting periods beginning after December 15, 2020. Early adoption is permitted. The Companies are in the process of evaluating the potential impact of the new guidance on the Companies’ financial position, results of operations and liquidity. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting ("ASU 2020-04"). The United Kingdom’s Financial Conduct Authority has announced that it intends to stop persuading or compelling banks to submit the London Interbank Offered Rate (“LIBOR”), a benchmark interest rate referenced in a variety of agreements, after 2021. ASU 2020-04 provides entities with optional expedients and exceptions for applying generally accepted accounting principles to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. The guidance is applied prospectively from any date beginning March 12, 2020. The optional relief is temporary and generally cannot be applied to contract modifications and hedging relationships entered into or evaluated after, December 31, 2022. The Companies do not expect the new guidance to have a material impact on their financial position, results of operations or liquidity.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies and Other Matters (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
New Financial Accounting Standards	New Financial Accounting Standards In December 2019, the FASB issued amendments to the guidance for income taxes through ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” The amendments in this update simplify the accounting for income taxes by removing certain exceptions such as: 1) the incremental approach for intraperiod tax allocation when there is a loss from continuing operations and income or a gain from other items, 2) the requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment, 3) the ability not to recognize a deferred tax liability for a foreign subsidiary when a foreign equity method investment becomes a subsidiary, and 4) the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. For public entities, the amendments are effective for reporting periods beginning after December 15, 2020. Early adoption is permitted. The Companies are in the process of evaluating the potential impact of the new guidance on the Companies’ financial position, results of operations and liquidity. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting ("ASU 2020-04"). The United Kingdom’s Financial Conduct Authority has announced that it intends to stop persuading or compelling banks to submit the London Interbank Offered Rate (“LIBOR”), a benchmark interest rate referenced in a variety of agreements, after 2021. ASU 2020-04 provides entities with optional expedients and exceptions for applying generally accepted accounting principles to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. The guidance is applied prospectively from any date beginning March 12, 2020. The optional relief is temporary and generally cannot be applied to contract modifications and hedging relationships entered into or evaluated after, December 31, 2022. The Companies do not expect the new guidance to have a material impact on their financial position, results of operations or liquidity.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies and Other Matters (Tables)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Rollforward of Allowance for Credit Losses	The table below presents a rollforward by major portfolio segment type for the three and six months ended June 30, 2020 : For the Three Months Ended June 30, 2020 Con Edison CECONY (Millions of Dollars) Accounts receivable - customers Other receivables Accounts receivable - customers Other receivables Allowance for credit losses Beginning Balance at April 1, 2020 $75 $5 $70 $3 Recoveries 2 — 2 — Write-offs (15) (1) (14) — Reserve adjustments 25 1 23 — Ending Balance June 30, 2020 $87 $5 $81 $3 For the Six Months Ended June 30, 2020 Con Edison CECONY (Millions of Dollars) Accounts receivable - customers Other receivables Accounts receivable - customers Other receivables Allowance for credit losses Beginning Balance at January 1, 2020 $70 $4 $65 $3 Recoveries 4 — 4 — Write-offs (34) (1) (32) (1) Reserve adjustments 47 2 44 1 Ending Balance June 30, 2020 $87 $5 $81 $3
Basic and Diluted Earnings Per Share	For the three and six months ended June 30, 2020 and 2019 , 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) 2020 2019 2020 2019 Net income for common stock $190 $152 $565 $576 Weighted average common shares outstanding – basic 334.1 328.3 333.8 325.2 Add: Incremental shares attributable to effect of potentially dilutive securities 0.9 0.9 0.9 0.9 Adjusted weighted average common shares outstanding – diluted 335.0 329.2 334.7 326.1 Net Income per common share – basic $0.57 $0.46 $1.69 $1.77 Net Income per common share – diluted $0.57 $0.46 $1.69 $1.77
Changes in Accumulated Other Comprehensive Income/(Loss)	For the three and six months ended June 30, 2020 and 2019 , 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) 2020 2019 2020 2019 Beginning balance, accumulated OCI, net of taxes (a) $(14) $(12) $(5) $(5) Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2020 (a)(b) — 1 1 — Current period OCI, net of taxes — 1 1 — Ending balance, accumulated OCI, net of taxes $(14) $(11) $(4) $(5) For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Beginning balance, accumulated OCI, net of taxes (a) $(19) $(16) $(6) $(5) OCI before reclassifications, net of tax of $(1) for Con Edison in 2020 and 2019 4 2 — — Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2020 and 2019 (a)(b) 1 3 2 — Current period OCI, net of taxes 5 5 2 — Ending balance, accumulated OCI, net of taxes $(14) $(11) $(4) $(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 and liabilities 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, 2020 and 2019 , cash, temporary cash investments and restricted cash for Con Edison and CECONY were as follows: At June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Cash and temporary cash investments $1,144 $831 $1,096 $786 Restricted cash (a) 201 139 — — Total cash, temporary cash investments and restricted cash $1,345 $970 $1,096 $786 (a) Restricted cash included cash of the Clean Energy Businesses' renewable electric production project subsidiaries ( $192 million and $138 million at June 30, 2020 and 2019 , respectively) that, under the related project debt agreements, is either 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 or restricted as a result of the PG&E bankruptcy. During the pendency of the PG&E bankruptcy, cash was not distributed from the related projects to the Clean Energy Businesses. In July 2020, PG&E’s plan of reorganization became effective. In July 2020, the Clean Energy Businesses received previously restricted distributions and have resumed distributions for all projects. See “Long-Lived and Intangible Assets,” above, and Note C. At June 30, 2020, restricted cash included cash deposits held by the Clean Energy Businesses’ battery storage business ($9 million). At June 30, 2019, 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 ) .
Schedule of Cash and Cash Equivalents	At June 30, 2020 and 2019 , cash, temporary cash investments and restricted cash for Con Edison and CECONY were as follows: At June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Cash and temporary cash investments $1,144 $831 $1,096 $786 Restricted cash (a) 201 139 — — Total cash, temporary cash investments and restricted cash $1,345 $970 $1,096 $786 (a) Restricted cash included cash of the Clean Energy Businesses' renewable electric production project subsidiaries ( $192 million and $138 million at June 30, 2020 and 2019 , respectively) that, under the related project debt agreements, is either 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 or restricted as a result of the PG&E bankruptcy. During the pendency of the PG&E bankruptcy, cash was not distributed from the related projects to the Clean Energy Businesses. In July 2020, PG&E’s plan of reorganization became effective. In July 2020, the Clean Energy Businesses received previously restricted distributions and have resumed distributions for all projects. See “Long-Lived and Intangible Assets,” above, and Note C. At June 30, 2020, restricted cash included cash deposits held by the Clean Energy Businesses’ battery storage business ($9 million). At June 30, 2019, 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 ) .

Regulatory Matters (Tables)

Regulatory Matters (Tables)	6 Months Ended
Regulatory Matters (Tables)	Jun. 30, 2020
Regulated Operations [Abstract]
Schedule of Regulatory Assets	Regulatory assets and liabilities at June 30, 2020 and December 31, 2019 were comprised of the following items: Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Regulatory assets Unrecognized pension and other postretirement costs $2,072 $2,541 $1,947 $2,403 Environmental remediation costs 729 732 648 647 Revenue taxes 336 321 322 308 Property tax reconciliation 235 219 230 210 Pension and other postretirement benefits deferrals 229 71 196 47 MTA power reliability deferral 212 248 212 248 Deferred derivative losses 142 83 133 76 System peak reduction and energy efficiency programs 103 131 102 130 Municipal infrastructure support costs 72 75 72 75 Deferred storm costs 70 77 — — Brooklyn Queens demand management program 37 39 37 39 Meadowlands heater odorization project 34 35 34 35 Gate station upgrade project 28 19 28 19 Unamortized loss on reacquired debt 24 28 22 26 Recoverable REV demonstration project costs 23 21 21 19 Preferred stock redemption 22 22 22 22 Non-wire alternative projects 14 14 14 14 Workers’ compensation — 3 — 3 Other 224 180 212 166 Regulatory assets – noncurrent 4,606 4,859 4,252 4,487 Deferred derivative losses 106 128 93 113 Recoverable energy costs 11 — 4 — Regulatory assets – current 117 128 97 113 Total Regulatory Assets $4,723 $4,987 $4,349 $4,600 Regulatory liabilities Future income tax $2,323 $2,426 $2,175 $2,275 Allowance for cost of removal less salvage 1,035 989 884 843 TCJA net benefits* 379 471 366 454 Net proceeds from sale of property 159 173 159 173 Net unbilled revenue deferrals 155 199 155 199 Energy efficiency portfolio standard unencumbered funds 88 122 85 118 Pension and other postretirement benefit deferrals 72 75 40 46 System benefit charge carrying charge 56 48 50 44 Property tax refunds 38 45 38 45 Unrecognized other postretirement costs 33 9 — — BQDM and REV Demo reconciliations 26 27 25 26 Settlement of gas proceedings 22 10 22 10 Sales and use tax refunds 18 8 18 8 Earnings sharing - electric, gas and steam 17 22 10 15 Settlement of prudence proceeding 7 8 7 8 Other 224 195 188 163 Regulatory liabilities – noncurrent 4,652 4,827 4,222 4,427 Refundable energy costs 31 44 8 12 Deferred derivative gains 32 34 31 34 Revenue decoupling mechanism — 24 — 17 Regulatory liabilities – current 63 102 39 63 Total Regulatory Liabilities $4,715 $4,929 $4,261 $4,490 * See "Other Regulatory Matters," above.
Schedule of Regulatory Liabilities	Regulatory assets and liabilities at June 30, 2020 and December 31, 2019 were comprised of the following items: Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Regulatory assets Unrecognized pension and other postretirement costs $2,072 $2,541 $1,947 $2,403 Environmental remediation costs 729 732 648 647 Revenue taxes 336 321 322 308 Property tax reconciliation 235 219 230 210 Pension and other postretirement benefits deferrals 229 71 196 47 MTA power reliability deferral 212 248 212 248 Deferred derivative losses 142 83 133 76 System peak reduction and energy efficiency programs 103 131 102 130 Municipal infrastructure support costs 72 75 72 75 Deferred storm costs 70 77 — — Brooklyn Queens demand management program 37 39 37 39 Meadowlands heater odorization project 34 35 34 35 Gate station upgrade project 28 19 28 19 Unamortized loss on reacquired debt 24 28 22 26 Recoverable REV demonstration project costs 23 21 21 19 Preferred stock redemption 22 22 22 22 Non-wire alternative projects 14 14 14 14 Workers’ compensation — 3 — 3 Other 224 180 212 166 Regulatory assets – noncurrent 4,606 4,859 4,252 4,487 Deferred derivative losses 106 128 93 113 Recoverable energy costs 11 — 4 — Regulatory assets – current 117 128 97 113 Total Regulatory Assets $4,723 $4,987 $4,349 $4,600 Regulatory liabilities Future income tax $2,323 $2,426 $2,175 $2,275 Allowance for cost of removal less salvage 1,035 989 884 843 TCJA net benefits* 379 471 366 454 Net proceeds from sale of property 159 173 159 173 Net unbilled revenue deferrals 155 199 155 199 Energy efficiency portfolio standard unencumbered funds 88 122 85 118 Pension and other postretirement benefit deferrals 72 75 40 46 System benefit charge carrying charge 56 48 50 44 Property tax refunds 38 45 38 45 Unrecognized other postretirement costs 33 9 — — BQDM and REV Demo reconciliations 26 27 25 26 Settlement of gas proceedings 22 10 22 10 Sales and use tax refunds 18 8 18 8 Earnings sharing - electric, gas and steam 17 22 10 15 Settlement of prudence proceeding 7 8 7 8 Other 224 195 188 163 Regulatory liabilities – noncurrent 4,652 4,827 4,222 4,427 Refundable energy costs 31 44 8 12 Deferred derivative gains 32 34 31 34 Revenue decoupling mechanism — 24 — 17 Regulatory liabilities – current 63 102 39 63 Total Regulatory Liabilities $4,715 $4,929 $4,261 $4,490 * See "Other Regulatory Matters," above.

Capitalization (Tables)

Capitalization (Tables)	6 Months Ended
Capitalization (Tables)	Jun. 30, 2020
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, 2020 and December 31, 2019 were: (Millions of Dollars) 2020 2019 Long-Term Debt (including current portion) (a) Carrying Amount Fair Value Carrying Amount Fair Value Con Edison $21,114 $25,183 $19,973 $22,738 CECONY $16,194 $20,001 $14,964 $17,505 (a) Amounts shown are net of unamortized debt expense and unamortized debt discount of $196 million and $170 million for Con Edison and CECONY, respectively, as of June 30, 2020 and $178 million and $151 million for Con Edison and CECONY, respectively, as of December 31, 2019 .

Pension Benefits (Tables)

Pension Benefits (Tables)	6 Months Ended
Pension Benefits (Tables)	Jun. 30, 2020
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, 2020 and 2019 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Service cost – including administrative expenses $73 $62 $69 $58 Interest cost on projected benefit obligation 137 150 129 141 Expected return on plan assets (258) (247) (245) (234) Recognition of net actuarial loss 175 130 165 123 Recognition of prior service credit (4) (4) (5) (5) TOTAL PERIODIC BENEFIT COST $123 $91 $113 $83 Cost capitalized (33) (29) (32) (27) Reconciliation to rate level (62) (2) (59) (1) Total expense recognized $28 $60 $22 $55 For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Service cost – including administrative expenses $147 $125 $137 $117 Interest cost on projected benefit obligation 275 301 258 282 Expected return on plan assets (517) (494) (490) (468) Recognition of net actuarial loss 349 259 331 246 Recognition of prior service credit (8) (9) (10) (10) TOTAL PERIODIC BENEFIT COST $246 $182 $226 $167 Cost capitalized (64) (55) (61) (52) Reconciliation to rate level (126) (7) (121) (6) Total expense recognized $56 $120 $44 $109 The components of the Companies’ total periodic other postretirement benefit cost/(credit) for the three and six months ended June 30, 2020 and 2019 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Service cost $5 $4 $4 $3 Interest cost on accumulated other postretirement benefit obligation 9 11 8 9 Expected return on plan assets (16) (16) (14) (14) Recognition of net actuarial loss/(gain) 3 (2) 3 (2) Recognition of prior service credit (1) (1) — — TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT) $— $(4) $1 $(4) Cost capitalized (2) (2) (2) (2) Reconciliation to rate level 2 3 — 2 Total credit recognized $— $(3) $(1) $(4) For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Service cost $11 $9 $8 $6 Interest cost on accumulated other postretirement benefit obligation 19 22 16 18 Expected return on plan assets (33) (33) (27) (27) Recognition of net actuarial loss/(gain) 30 (4) 29 (5) Recognition of prior service credit (2) (2) (1) (1 ) TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT) $25 $(8) $25 $(9) Cost capitalized (5) (4) (3) (3) Reconciliation to rate level (20) 7 (24) 4 Total credit recognized $— $(5) $(2) $(8)

Environmental Matters (Tables)

Environmental Matters (Tables)	6 Months Ended
Environmental Matters (Tables)	Jun. 30, 2020
Environmental Remediation Obligations [Abstract]
Accrued Liabilities and Regulatory Assets	The accrued liabilities and regulatory assets related to Superfund Sites at June 30, 2020 and December 31, 2019 were as follows: Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Accrued Liabilities: Manufactured gas plant sites $633 $640 $554 $561 Other Superfund Sites 101 94 100 93 Total $734 $734 $654 $654 Regulatory assets $729 $732 $648 $647
Environmental Remediation Costs	Environmental remediation costs incurred related to Superfund Sites for the three and six months ended June 30, 2020 and 2019 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Remediation costs incurred $3 $8 $3 $6 For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Remediation costs incurred $8 $11 $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, 2020 and December 31, 2019 were as follows: Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Accrued liability – asbestos suits $8 $8 $7 $7 Regulatory assets – asbestos suits $8 $8 $7 $7 Accrued liability – workers’ compensation $75 $78 $70 $73 Regulatory assets – workers’ compensation $— $3 $— $3

Other Material Contingencies (T

Other Material Contingencies (Tables)	6 Months Ended
Other Material Contingencies (Tables)	Jun. 30, 2020
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, 2020 is as follows: Guarantee Type 0 – 3 years 4 – 10 years > 10 years Total (Millions of Dollars) Con Edison Transmission $362 $186 $— $548 Energy transactions 447 48 233 728 Renewable electric production projects 207 9 382 598 Other 70 — — 70 Total $1,086 $243 $615 $1,944

Leases (Tables)

Leases (Tables)	6 Months Ended
Leases (Tables)	Jun. 30, 2020
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, 2020 and 2019 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Operating lease cost $21 $21 $16 $16 Operating lease cash flows $8 $9 $4 $4 For the Six Months Ended June 30, 2020 Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Operating lease cost $42 $41 $32 $32 Operating lease cash flows $16 $17 $8 $8 Other information related to leases for Con Edison and CECONY at June 30, 2020 and December 31, 2019 were as follows: Con Edison CECONY 2020 2019 2020 2019 Weighted Average Remaining Lease Term: Operating leases 19.2 years 19.8 years 13.5 years 14.0 years Finance leases 7.5 years 12.2 years 4.4 years 2.4 years Weighted Average Discount Rate: Operating leases 4.3% 4.3% 3.6% 3.6% Finance leases 1.8% 3.5% 1.4% 4.1%
Operating Leases, Future Minimum Lease Payments	Future minimum lease payments under non-cancellable leases at June 30, 2020 were as follows: (Millions of Dollars) Con Edison CECONY Year Ending June 30, Operating Leases Finance Leases Operating Leases Finance Leases 2021 $80 $1 $60 $1 2022 76 1 57 1 2023 73 — 56 — 2024 73 — 56 — 2025 74 — 57 — All years thereafter 993 1 504 — Total future minimum lease payments $1,369 $3 $790 $2 Less: imputed interest (475) — (167) — Total $894 $3 $623 $2 Reported as of June 30, 2020 Operating lease liabilities (current) $83 $— $64 $— Operating lease liabilities (noncurrent) 811 — 559 — Other current liabilities — 1 — 1 Other noncurrent liabilities — 2 — 1 Total $894 $3 $623 $2
Finance Leases, Future Minimum Lease Payments	Future minimum lease payments under non-cancellable leases at June 30, 2020 were as follows: (Millions of Dollars) Con Edison CECONY Year Ending June 30, Operating Leases Finance Leases Operating Leases Finance Leases 2021 $80 $1 $60 $1 2022 76 1 57 1 2023 73 — 56 — 2024 73 — 56 — 2025 74 — 57 — All years thereafter 993 1 504 — Total future minimum lease payments $1,369 $3 $790 $2 Less: imputed interest (475) — (167) — Total $894 $3 $623 $2 Reported as of June 30, 2020 Operating lease liabilities (current) $83 $— $64 $— Operating lease liabilities (noncurrent) 811 — 559 — Other current liabilities — 1 — 1 Other noncurrent liabilities — 2 — 1 Total $894 $3 $623 $2

Income Tax (Tables)

Income Tax (Tables)	6 Months Ended
Income Tax (Tables)	Jun. 30, 2020
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, 2020 and 2019 is as follows: Con Edison CECONY (% of Pre-tax income) 2020 2019 2020 2019 STATUTORY TAX RATE Federal 21 % 21 % 21 % 21 % Changes in computed taxes resulting from: State income tax 5 5 5 5 Amortization of excess deferred federal income taxes (12 ) (4 ) (12 ) (4 ) Taxes attributable to non-controlling interest (1 ) (1 ) — — Cost of removal 2 1 2 1 Other plant-related items (2 ) (1 ) (2 ) — Renewable energy credits (3 ) (2 ) — — CARES Act NOL carryback (1 ) — — — Amortization of excess deferred state income taxes — (1 ) — (1 ) Other 1 (1 ) 1 (1 ) Effective tax rate 10 % 17 % 15 % 21 % 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, 2020 and 2019 is as follows: Con Edison CECONY (% of Pre-tax income) 2020 2019 2020 2019 STATUTORY TAX RATE Federal 21 % 21 % 21 % 21 % Changes in computed taxes resulting from: State income tax 6 6 6 5 Amortization of excess deferred federal income taxes (20 ) (9 ) (25 ) (9 ) Taxes attributable to non-controlling interest (2 ) (4 ) — — Cost of removal 4 2 5 2 Other plant-related items (3 ) (1 ) (4 ) (1 ) Allowance for uncollectible accounts 1 — 1 — Renewable energy credits (4 ) (4 ) — — Amortization of excess deferred state income taxes — (2 ) — (2 ) Other 1 1 — (1 ) Effective tax rate 4 % 10 % 4 % 15 %

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
Revenue Recognition (Tables)	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table presents, for the three and six months ended June 30, 2020 and 2019 , revenue from contracts with customers as defined in 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, 2020 For the Three Months Ended June 30, 2019 (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 $1,781 $64 $1,845 $1,751 $82 $1,833 Gas 399 17 416 400 8 408 Steam 81 3 84 86 4 90 Total CECONY $2,261 $84 $2,345 $2,237 $94 $2,331 O&R Electric 139 (1) 138 140 (2) 138 Gas 37 — 37 39 2 41 Total O&R $176 $(1) $175 $179 $— $179 Clean Energy Businesses Renewables 178 (b) — 178 171 (b) — 171 Energy services 11 — 11 16 — 16 Other — 9 9 — 46 46 Total Clean Energy Businesses $189 $9 $198 $187 $46 $233 Con Edison Transmission 1 — 1 1 — 1 Total Con Edison $2,627 $92 $2,719 $2,604 $140 $2,744 (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 $2 million and $4 million for the three months ended June 30, 2020 and 2019 , respectively, of revenue related to engineering, procurement and construction services. For the Six Months Ended June 30, 2020 For the Six Months Ended June 30, 2019 (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 $3,514 $102 $3,616 $3,465 $165 $3,630 Gas 1,232 18 1,250 1,310 20 1,330 Steam 325 9 334 402 9 411 Total CECONY $5,071 $129 $5,200 $5,177 $194 $5,371 O&R Electric 267 7 274 283 — 283 Gas 130 4 134 153 1 154 Total O&R $397 $11 $408 $436 $1 $437 Clean Energy Businesses Renewables 292 (b) — 292 278 (b) — 278 Energy services 22 — 22 39 — 39 Other — 30 30 — 133 133 Total Clean Energy Businesses $314 $30 $344 $317 $133 $450 Con Edison Transmission 2 — 2 2 — 2 Other (c) — (1) (1) — (2) (2) Total Con Edison $5,784 $169 $5,953 $5,932 $326 $6,258 (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 $6 million for the six months ended June 30, 2020 and 2019 , respectively, of revenue related to engineering, procurement and construction services. (c) P arent company and consolidation adjustments.
Change in Unbilled Contract and Unearned Revenues	2020 2019 (Millions of Dollars) Unbilled contract revenue (a) Unearned revenue (b) Unbilled contract revenue (a) Unearned revenue (b) Beginning balance as of January 1, $29 $17 $29 $20 Additions (c) 58 31 44 — Subtractions (c) 65 1 (d) 38 2 (d) Ending balance as of June 30, $22 $47 $35 $18 (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, $1 million and $2 million were included in the balances as of January 1, 2020 and 2019 , respectively.

Financial Information by Busi_2

Financial Information by Business Segment (Tables)	6 Months Ended
Financial Information by Business Segment (Tables)	Jun. 30, 2020
Segment Reporting [Abstract]
Financial Data for Business Segments	The financial data for the business segments for the three and six months ended June 30, 2020 and 2019 were as follows: For the Three Months Ended June 30, Operating Inter-segment Depreciation and Operating (Millions of Dollars) 2020 2019 2020 2019 2020 2019 2020 2019 CECONY Electric $1,845 $1,833 $4 $5 $301 $261 $318 $314 Gas 416 408 2 2 72 56 105 94 Steam 84 90 19 16 23 22 (34) (32) Consolidation adjustments — — (25) (23) — — — — Total CECONY $2,345 $2,331 $— $— $396 $339 $389 $376 O&R Electric $138 $138 $— $— $16 $15 $13 $16 Gas 37 41 — — 7 6 (3) (3) Total O&R $175 $179 $— $— $23 $21 $10 $13 Clean Energy Businesses $198 $233 $— $— $57 $58 $82 $72 Con Edison Transmission 1 1 — — — — (1) (2) Other (a) — — — — — — (1) (1) Total Con Edison $2,719 $2,744 $— $— $476 $418 $479 $458 (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) 2020 2019 2020 2019 2020 2019 2020 2019 CECONY Electric $3,616 $3,630 $9 $9 $598 $518 $600 $571 Gas 1,250 1,330 3 3 143 111 474 438 Steam 334 411 38 35 45 44 58 92 Consolidation adjustments — — (50) (47) — — — — Total CECONY $5,200 $5,371 $— $— $786 $673 $1,132 $1,101 O&R Electric $274 $283 $— $— $32 $30 $27 $31 Gas 134 154 — — 13 12 38 36 Total O&R $408 $437 $— $— $45 $42 $65 $67 Clean Energy Businesses $344 $450 $— $— $115 $116 $96 $83 Con Edison Transmission 2 2 — — — — (3) (3) Other (a) (1) (2) — — — — (3) (4) Total Con Edison $5,953 $6,258 $— $— $946 $831 $1,287 $1,244 (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
Derivative Instruments and Hedging Activities (Tables)	Jun. 30, 2020
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, 2020 and December 31, 2019 were: (Millions of Dollars) 2020 2019 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 $57 $32 $89 (b) $60 $(3) $57 (b) Noncurrent 15 (11) 4 19 (13) 6 (d) Total fair value of derivative assets $72 $21 $93 $79 $(16) $63 Fair value of derivative liabilities Current $(137) $(33) $(170) (c) $(140) $17 $(123) (d) Noncurrent (255) 13 (242) (c) (122) 16 (106) (d) Total fair value of derivative liabilities $(392) $(20) $(412) $(262) $33 $(229) Net fair value derivative assets/(liabilities) $(320) $1 $(319) $(183) $17 $(166) CECONY Fair value of derivative assets Current $41 $(22) $19 (b) $39 $(6) $33 (b) Noncurrent 13 (9) 4 17 (12) 5 Total fair value of derivative assets $54 $(31) $23 $56 $(18) $38 Fair value of derivative liabilities Current $(93) $24 $(69) $(100) $19 $(81) Noncurrent (138) 10 (128) (80) 16 (64) Total fair value of derivative liabilities $(231) $34 $(197) $(180) $35 $(145) Net fair value derivative assets/(liabilities) $(177) $3 $(174) $(124) $17 $(107) (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, 2020 and December 31, 2019 , margin deposits for Con Edison ( $7 million and $9 million , respectively) and CECONY ( $6 million and $8 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 $(21) million in current liabilities and $(108) million in noncurrent liabilities. At June 30, 2020 , the Clean Energy Businesses had interest rate swaps with notional amounts of $892 million . The expiration dates of the swaps range from 2024-2041. (d) Includes amounts for interest rate swaps of $1 million in noncurrent assets, $(7) million in current liabilities and $(34) million in noncurrent liabilities. At December 31, 2019 , the Clean Energy Businesses had interest rate swaps with notional amounts of $919 million . The expiration dates of the swaps range from 2024-2041.
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, 2020 and December 31, 2019 were: (Millions of Dollars) 2020 2019 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 $57 $32 $89 (b) $60 $(3) $57 (b) Noncurrent 15 (11) 4 19 (13) 6 (d) Total fair value of derivative assets $72 $21 $93 $79 $(16) $63 Fair value of derivative liabilities Current $(137) $(33) $(170) (c) $(140) $17 $(123) (d) Noncurrent (255) 13 (242) (c) (122) 16 (106) (d) Total fair value of derivative liabilities $(392) $(20) $(412) $(262) $33 $(229) Net fair value derivative assets/(liabilities) $(320) $1 $(319) $(183) $17 $(166) CECONY Fair value of derivative assets Current $41 $(22) $19 (b) $39 $(6) $33 (b) Noncurrent 13 (9) 4 17 (12) 5 Total fair value of derivative assets $54 $(31) $23 $56 $(18) $38 Fair value of derivative liabilities Current $(93) $24 $(69) $(100) $19 $(81) Noncurrent (138) 10 (128) (80) 16 (64) Total fair value of derivative liabilities $(231) $34 $(197) $(180) $35 $(145) Net fair value derivative assets/(liabilities) $(177) $3 $(174) $(124) $17 $(107) (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, 2020 and December 31, 2019 , margin deposits for Con Edison ( $7 million and $9 million , respectively) and CECONY ( $6 million and $8 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 $(21) million in current liabilities and $(108) million in noncurrent liabilities. At June 30, 2020 , the Clean Energy Businesses had interest rate swaps with notional amounts of $892 million . The expiration dates of the swaps range from 2024-2041. (d) Includes amounts for interest rate swaps of $1 million in noncurrent assets, $(7) million in current liabilities and $(34) million in noncurrent liabilities. At December 31, 2019 , the Clean Energy Businesses had interest rate swaps with notional amounts of $919 million . The expiration dates of the swaps range from 2024-2041.
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, 2020 and 2019 : For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) Balance Sheet Location 2020 2019 2020 2019 Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: Current Deferred derivative gains $(2) $(16) $(2) $(15) Noncurrent Deferred derivative gains (6) (2) (6) — Total deferred gains/(losses) $(8) $(18) $(8) $(15) Current Deferred derivative losses $36 $(36) $32 $(34) Current Recoverable energy costs (45) (41) (40) (37) Noncurrent Deferred derivative losses (13) (74) (15) (68) Total deferred gains/(losses) $(22) $(151) $(23) $(139) Net deferred gains/(losses) $(30) $(169) $(31) $(154) Income Statement Location Pre-tax gains/(losses) recognized in income Non-utility revenue $1 $7 $— $— Other operations and maintenance expense 2 — 2 — Other interest expense (4) (24) — — Total pre-tax gains/(losses) recognized in income $(1) $(17) $2 $— For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) Balance Sheet Location 2020 2019 2020 2019 Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations: Current Deferred derivative gains $(3) $(12) $(3) $(11) Noncurrent Deferred derivative gains (3) (8) (3) (6) Total deferred gains/(losses) $(6) $(20) $(6) $(17) Current Deferred derivative losses $22 $(39) $20 $(34) Current Recoverable energy costs (140) (59) (126) (51) Noncurrent Deferred derivative losses (58) (100) (58) (95) Total deferred gains/(losses) $(176) $(198) $(164) $(180) Net deferred gains/(losses) $(182) $(218) $(170) $(197) Income Statement Location Pre-tax gains/(losses) recognized in income Gas purchased for resale $(3) $(2) $— $— Non-utility revenue 5 15 — — Other operations and maintenance expense (5) 1 (5) 1 Other interest expense (89) (34) — — Total pre-tax gains/(losses) recognized in income $(92) $(20) $(5) $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, 2020 : Electric Energy (MWh) (a)(b) Capacity (MW) (a) Natural Gas (Dt) (a)(b) Refined Fuels (gallons) Con Edison 33,140,975 39,561 286,817,088 9,744,000 CECONY 30,767,675 33,900 268,660,000 9,744,000 (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, 2020 : (Millions of Dollars) Con Edison (a) CECONY (a) Aggregate fair value – net liabilities $195 $179 Collateral posted 123 111 Additional collateral (b) (downgrade one level from current ratings) 15 9 Additional collateral (b) (downgrade to below investment grade from current ratings) 84 (c) 67 (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 $20 million of additional collateral at June 30, 2020 . 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, 2020 , if Con Edison had been downgraded to below investment grade, it would have been required to post additional collateral for such derivative instruments of $37 million .

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
Fair Value Measurements (Tables)	Jun. 30, 2020
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, 2020 and December 31, 2019 are summarized below. 2020 2019 (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) $14 $44 $2 $41 $101 $4 $61 $2 $4 $71 Interest rate swaps (a)(b)(c) — — — — — — 1 — — 1 Other (a)(b)(d) 375 116 — — 491 353 125 — — 478 Total assets $389 $160 $2 $41 $592 $357 $187 $2 $4 $550 Derivative liabilities: Commodity (a)(b)(c) $12 $221 $16 $33 $282 $18 $174 $18 $(22) $188 Interest rate swaps (a)(b)(c) — 130 — — 130 — 41 — — 41 Total liabilities $12 $351 $16 $33 $412 $18 $215 $18 $(22) $229 CECONY Derivative assets: Commodity (a)(b)(c) $11 $31 $1 $(15) $28 $3 $42 $1 $— $46 Other (a)(b)(d) 356 111 — — 467 333 119 — — 452 Total assets $367 $142 $1 $(15) $495 $336 $161 $1 $— $498 Derivative liabilities: Commodity (a)(b)(c) $10 $201 $8 $(22) $197 $15 $147 $7 $(24) $145 (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, 2020 . Con Edison and CECONY had $24 million and $22 million , respectively, of commodity derivative liabilities transferred from level 3 to level 2 during the year ended December 31, 2019 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, 2019 to less than three years as of December 31, 2019 . (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, 2020 and December 31, 2019 , 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, 2020 Valuation Techniques Unobservable Inputs Range (Millions of Dollars) Con Edison – Commodity Electricity $(1) Discounted Cash Flow Forward energy prices (a) $21.00 - $62.76 per MWh (14) Discounted Cash Flow Forward capacity prices (a) $0.30 - $8.75 per kW-month Transmission Congestion Contracts/Financial Transmission Rights 1 Discounted Cash Flow Inter-zonal forward price curves adjusted for historical zonal losses (b) $(24.58) - $46.10 per MWh Total Con Edison—Commodity $(14) CECONY – Commodity Electricity $(1) Discounted Cash Flow Forward energy prices (a) $23.02 - $62.76 per MWh (7) Discounted Cash Flow Forward capacity prices (a) $0.30 - $8.62 per kW-month Transmission Congestion Contracts 1 Discounted Cash Flow Inter-zonal forward price curves adjusted for historical zonal losses (b) $0.32 - $1.51 per MWh Total CECONY—Commodity $(7) (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, 2020 and 2019 and classified as Level 3 in the fair value hierarchy: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Beginning balance as of April 1, $(13) $(19) $(6) $(5) Included in earnings (2) — (1) 1 Included in regulatory assets and liabilities — (27) 1 (25) Settlements 1 — (1) (1) Ending balance as of June 30, $(14) $(46) $(7) $(30) For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Beginning balance as of January 1, $(16) $(13) $(6) $(2) Included in earnings (7) (4) (3) 1 Included in regulatory assets and liabilities 1 (31) (1) (28) Settlements 8 2 3 (1) Ending balance as of June 30, $(14) $(46) $(7) $(30)

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	6 Months Ended
Variable Interest Entities (Tables)	Jun. 30, 2020
Equity Method Investments and Joint Ventures [Abstract]
Summary of VIEs	At June 30, 2020 and December 31, 2019 , Con Edison’s consolidated balance sheet included the following amounts associated with its VIEs: Tax Equity Projects Great Valley Solar Copper Mountain - Mesquite Solar (Millions of Dollars) 2020 2019 2020 2019 Non-utility property, less accumulated depreciation (f)(g) $288 $293 $453 $461 Other assets 45 40 189 128 Total assets (a) $333 $333 $642 $589 Other liabilities 15 17 69 18 Total liabilities (b) $15 $17 $69 $18 (a) The assets of the Tax Equity Projects 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 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 $73 million and $62 million at June 30, 2020 and December 31, 2019 , 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 $140 million and $126 million at June 30, 2020 and December 31, 2019 , respectively. (f) Non-utility property is reduced by accumulated depreciation of $13 million for Great Valley Solar and $23 million for Copper Mountain - Mesquite Solar at June 30, 2020 . (g) Non-utility property is reduced by accumulated depreciation of $9 million for Great Valley Solar and $15 million for Copper Mountain - Mesquite Solar at December 31, 2019 .

General (Details)

General (Details)	6 Months Ended
General (Details)	Jun. 30, 2020subsidiaryregistrant
Accounting Policies [Abstract]
Number of registrants \| registrant	2
Number of regulated utility subsidiaries \| subsidiary	2

Summary of Significant Accoun_4

Summary of Significant Accounting Policies and Other Matters - Adoption of New Standard (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic	$ 12	$ 18
Accounts receivable - customers
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	75	70
Recoveries	2	4
Write-offs	(15)	(34)
Reserve adjustments	25	47
Ending Balance	87	87
Other receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	5	4
Recoveries	0	0
Write-offs	(1)	(1)
Reserve adjustments	1	2
Ending Balance	5	5
CECONY
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic	11	16
CECONY \| Accounts receivable - customers
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	70	65
Recoveries	2	4
Write-offs	(14)	(32)
Reserve adjustments	23	44
Ending Balance	81	81
CECONY \| Other receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	3	3
Recoveries	0	0
Write-offs	0	(1)
Reserve adjustments	0	1
Ending Balance	$ 3	$ 3

Summary of Significant Accoun_5

Summary of Significant Accounting Policies and Other Matters - Utility Plant (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ 152	$ 126
Software Licenses
Finite-Lived Intangible Assets [Line Items]
Gross asset	90	93
Accumulated amortization		10
CECONY \| Software Licenses
Finite-Lived Intangible Assets [Line Items]
Gross asset	85	88
Estimated aggregate annual amortization expense	7
Accumulated amortization	$ 13	$ 10

Summary of Significant Accoun_6

Summary of Significant Accounting Policies and Other Matters - Long-Lived and Intangible Assets (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)MW	Jun. 30, 2020USD ($)
Finite-Lived Intangible Assets [Line Items]
Net non-utility plant	$ 43,889	$ 44,897
Intangible assets	$ 1,557	$ 1,510
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_7

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accounting Policies [Abstract]
Net income for common stock	$ 190	$ 152	$ 565	$ 576
Weighted average common shares outstanding – basic (shares)	334.1	328.3	333.8	325.2
Add: Incremental shares attributable to effect of potentially dilutive securities (shares)	0.9	0.9	0.9	0.9
Adjusted weighted average common shares outstanding – diluted (shares)	335	329.2	334.7	326.1
Net income per common share - basic (dollars per share)	$ 0.57	$ 0.46	$ 1.69	$ 1.77
Net income per common share - diluted (dollars per share)	$ 0.57	$ 0.46	$ 1.69	$ 1.77

Summary of Significant Accoun_8

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, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 18,467	$ 18,213	$ 17,501	$ 16,839	$ 18,213	$ 16,839
Beginning Balance		18,022			18,022
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	0	5	1	4	5	5
Ending Balance	18,441	18,467	17,865	17,501	18,441	17,865
Ending Balance	18,225				18,225
Accumulated OCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(14)	(19)	(12)	(16)	(19)	(16)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES		5	1	4
Ending Balance	(14)	(14)	(11)	(12)	(14)	(11)
Pension Plan LIabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
OCI before reclassifications, net of tax of $(1) for Con Edison in 2020 and 2019					4	2
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2018	0		1		1	3
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	0		1		5	5
OCI before reclassifications, tax					(1)	(1)
Amounts reclassified from accumulated OCI related to pension plan liabilities, tax					(1)	(1)
CECONY
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	14,333	14,147	13,319	12,910	14,147	12,910
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	1	0	0	2	0
Ending Balance	14,265	14,333	13,868	13,319	14,265	13,868
CECONY \| Accumulated OCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(5)	(6)	(5)	(5)	(6)	(5)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	1
Ending Balance	(4)	$ (5)	(5)	$ (5)	(4)	(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 2020 and 2019					0	0
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2018	1		0		2	0
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	$ 1		$ 0		2	0
OCI before reclassifications, tax					(1)	(1)
Amounts reclassified from accumulated OCI related to pension plan liabilities, tax					$ (1)	$ (1)

Summary of Significant Accoun_9

Summary of Significant Accounting Policies and Other Matters - Reconciliation of Cash, Temporary Investments and Restricted Cash (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Cash and Cash Equivalents [Line Items]
Cash and temporary cash investments	$ 1,144	$ 981	$ 831
Restricted cash	201		139
Total cash, temporary cash investments and restricted cash	1,345	1,217	970	$ 1,006
CEB \| Cash Collateral Held for Project Finance Agreements
Cash and Cash Equivalents [Line Items]
Restricted cash	192		138
CECONY
Cash and Cash Equivalents [Line Items]
Cash and temporary cash investments	1,096	933	786
Restricted cash	0		0
Total cash, temporary cash investments and restricted cash	$ 1,096	$ 933	786	$ 818
RECO \| Transition Bond
Cash and Cash Equivalents [Line Items]
Restricted cash			$ 1

Regulatory Matters - COVID-19 R

Regulatory Matters - COVID-19 Regulatory Matters (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020USD ($)	Jun. 30, 2020USD ($)
CECONY
Public Utilities, General Disclosures [Line Items]
Earned EAM incentives		$ 46
O&R
Public Utilities, General Disclosures [Line Items]
Earned EAM incentives		3
COVID-19 \| CECONY
Public Utilities, General Disclosures [Line Items]
Estimated forgone revenues	$ 20	1.2
COVID-19 \| O&R
Public Utilities, General Disclosures [Line Items]
Estimated forgone revenues	23	1.4
Residential Customers \| COVID-19 \| CECONY
Public Utilities, General Disclosures [Line Items]
Deferred revenue	9	9
Expected deferred revenue	$ 58	58
Summer Cooling Credit Program \| Residential Customers \| COVID-19 \| CECONY
Public Utilities, General Disclosures [Line Items]
Cost of the program		$ 70.6
Cost of the program, recovery period		5 years

Regulatory Matters - Other Regu

Regulatory Matters - Other Regulatory Matters (Details) customer in Thousands, $ in Thousands	Aug. 05, 2020customer	Jul. 13, 2019USD ($)customer	Apr. 30, 2020USD ($)	Mar. 31, 2018customer	Sep. 30, 2018USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018	Dec. 31, 2022USD ($)	Jun. 30, 2020USD ($)
CECONY \| NYSPSC \| Manhattan Steam Main Rupture
Public Utilities, General Disclosures [Line Items]
Property damage, clean up and response expense						$ 17,000
Capital and retirement costs						9,000
Loss contingency accrual									$ 3,000
CECONY \| NYSPSC \| Steam
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA					$ 15,000	185,000
TCJA, net benefit amortization, allocation period					3 years
Tax credit, amortization period							3 years
CECONY \| Electric \| West Side of Manhattan
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer		72
Revenues, negative adjustment		$ 5,000
CECONY \| Electric \| Brooklyn
Public Utilities, General Disclosures [Line Items]
Revenues, negative adjustment		$ 10,000
CECONY \| Electric \| Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer				209
Restoration costs						134,000
Operation and maintenance expenses						15,000
Operation and maintenance expenses charged against a storm reserve						84,000
Capital expenditures						29,000
Removal costs						6,000
CECONY \| Electric \| Tropical Storm \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer	300
CECONY \| Electric \| NYSPSC \| Hurricane
Public Utilities, General Disclosures [Line Items]
Loss contingency accrual									5,600
CECONY \| Electric \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA								$ 377,000
TCJA, net benefit amortization, allocation period								3 years
CECONY \| Electric \| Scenario, Forecast \| Protected Portion
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA								$ 1,663,000
CECONY \| Electric \| Scenario, Forecast \| Unprotected Portion
Public Utilities, General Disclosures [Line Items]
TCJA, net benefit amortization, allocation period								5 years
Impact in regulatory liability resulting from TCJA								$ 784,000
CECONY \| Gas \| NYSPSC \| Violations of Gas Operator Qualification, Performance and Inspection Requirements
Public Utilities, General Disclosures [Line Items]
Loss contingency accrual						10,000			5,000
Settlement agreement, amount			$ 15,000
CECONY \| Gas \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA								$ 63,000
TCJA, net benefit amortization, allocation period								2 years
CECONY \| Gas \| Scenario, Forecast \| Protected Portion
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA								$ 725,000
CECONY \| Gas \| Scenario, Forecast \| Unprotected Portion
Public Utilities, General Disclosures [Line Items]
TCJA, net benefit amortization, allocation period								5 years
Impact in regulatory liability resulting from TCJA								$ 107,000
O&R \| Electric \| Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer				93
Restoration costs						43,000
O&R \| Electric \| Tropical Storm \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer	225
O&R \| Electric \| NYSPSC \| Hurricane
Public Utilities, General Disclosures [Line Items]
Loss contingency accrual									$ 850
O&R \| Electric and Gas Transmission Projects \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA								$ 22,000
TCJA, net benefit amortization, allocation period								3 years
O&R \| Electric and Gas Transmission Projects \| Scenario, Forecast \| Protected Portion
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA								$ 123,000
O&R \| Electric and Gas Transmission Projects \| Scenario, Forecast \| Unprotected Portion
Public Utilities, General Disclosures [Line Items]
TCJA, net benefit amortization, allocation period								15 years
Impact in regulatory liability resulting from TCJA								$ 30,000
RECO \| Electric \| Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer				44
Restoration costs						$ 17,000

Regulatory Matters - Regulatory

Regulatory Matters - Regulatory Assets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	$ 4,606	$ 4,859
Regulatory assets – current	117	128
Total Regulatory Assets	4,723	4,987
Unrecognized pension and other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	2,072	2,541
Environmental remediation costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	729	732
Revenue taxes
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	336	321
Property tax reconciliation
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	235	219
Pension and other postretirement benefits deferrals
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	229	71
MTA power reliability deferral
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	212	248
Deferred derivative losses
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	142	83
System peak reduction and energy efficiency programs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	103	131
Municipal infrastructure support costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	72	75
Deferred storm costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	70	77
Brooklyn Queens demand management program
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	37	39
Meadowlands heater odorization project
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	34	35
Gate station upgrade project
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	28	19
Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	24	28
Recoverable REV demonstration project costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	23	21
Preferred stock redemption
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	22	22
Non-wire alternative projects
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	14	14
Workers’ compensation
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	0	3
Other
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	224	180
Deferred derivative losses
Regulatory Assets [Line Items]
Regulatory assets – current	106	128
Recoverable energy costs
Regulatory Assets [Line Items]
Regulatory assets – current	11	0
CECONY
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	4,252	4,487
Regulatory assets – current	97	113
Total Regulatory Assets	4,349	4,600
CECONY \| Unrecognized pension and other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	1,947	2,403
CECONY \| Environmental remediation costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	648	647
CECONY \| Revenue taxes
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	322	308
CECONY \| Property tax reconciliation
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	230	210
CECONY \| Pension and other postretirement benefits deferrals
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	196	47
CECONY \| MTA power reliability deferral
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	212	248
CECONY \| Deferred derivative losses
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	133	76
CECONY \| System peak reduction and energy efficiency programs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	102	130
CECONY \| Municipal infrastructure support costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	72	75
CECONY \| Deferred storm costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	0	0
CECONY \| Brooklyn Queens demand management program
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	37	39
CECONY \| Meadowlands heater odorization project
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	34	35
CECONY \| Gate station upgrade project
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	28	19
CECONY \| Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	22	26
CECONY \| Recoverable REV demonstration project costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	21	19
CECONY \| Preferred stock redemption
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	22	22
CECONY \| Non-wire alternative projects
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	14	14
CECONY \| Workers’ compensation
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	0	3
CECONY \| Other
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	212	166
CECONY \| Deferred derivative losses
Regulatory Assets [Line Items]
Regulatory assets – current	93	113
CECONY \| Recoverable energy costs
Regulatory Assets [Line Items]
Regulatory assets – current	$ 4	$ 0

Regulatory Matters - Regulato_2

Regulatory Matters - Regulatory Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	$ 4,652	$ 4,827
Regulatory liabilities – current	63	102
Total Regulatory Liabilities	4,715	4,929
Future income tax
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	2,323	2,426
Allowance for cost of removal less salvage
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	1,035	989
TCJA net benefits
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	379	471
Net proceeds from sale of property
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	159	173
Net unbilled revenue deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	155	199
Energy efficiency portfolio standard unencumbered funds
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	88	122
Pension and other postretirement benefit deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	72	75
System benefit charge carrying charge
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	56	48
Property tax refunds
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	38	45
Unrecognized other postretirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	33	9
BQDM and REV Demo reconciliations
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	26	27
Settlement of gas proceedings
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	22	10
Sales and use tax refunds
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	18	8
Earnings sharing - electric, gas and steam
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	17	22
Settlement of prudence proceeding
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	7	8
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	224	195
Refundable energy costs
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	31	44
Deferred derivative gains
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	32	34
Revenue decoupling mechanism
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	0	24
CECONY
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	4,222	4,427
Regulatory liabilities – current	39	63
Total Regulatory Liabilities	4,261	4,490
CECONY \| Future income tax
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	2,175	2,275
CECONY \| Allowance for cost of removal less salvage
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	884	843
CECONY \| TCJA net benefits
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	366	454
CECONY \| Net proceeds from sale of property
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	159	173
CECONY \| Net unbilled revenue deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	155	199
CECONY \| Energy efficiency portfolio standard unencumbered funds
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	85	118
CECONY \| Pension and other postretirement benefit deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	40	46
CECONY \| System benefit charge carrying charge
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	50	44
CECONY \| Property tax refunds
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	38	45
CECONY \| Unrecognized other postretirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	0	0
CECONY \| BQDM and REV Demo reconciliations
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	25	26
CECONY \| Settlement of gas proceedings
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	22	10
CECONY \| Sales and use tax refunds
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	18	8
CECONY \| Earnings sharing - electric, gas and steam
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	10	15
CECONY \| Settlement of prudence proceeding
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	7	8
CECONY \| Other
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	188	163
CECONY \| Refundable energy costs
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	8	12
CECONY \| Deferred derivative gains
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	31	34
CECONY \| Revenue decoupling mechanism
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	$ 0	$ 17

Short-Term Borrowing (Details)

Short-Term Borrowing (Details)	Jul. 31, 2020USD ($)	Jun. 30, 2020USD ($)	Apr. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Short-term Debt [Line Items]
Commercial paper, outstanding		$ 1,813,000,000		$ 1,692,000,000
Loans outstanding under the credit agreement		$ 0		$ 0
Minimum percentage of liens on assets			5.00%
Failure to pay, maximum aggregate limit			$ 150,000,000
Commercial Paper
Short-term Debt [Line Items]
Weighted average interest rate		0.20%		2.00%
Subsequent Event
Short-term Debt [Line Items]
Face amount of debt	$ 820,000,000
Maximum
Short-term Debt [Line Items]
Ratio of consolidated debt to consolidated total capital			0.65
CECONY
Short-term Debt [Line Items]
Commercial paper, outstanding		$ 1,115,000,000		$ 1,137,000,000
CECONY \| Commercial Paper
Short-term Debt [Line Items]
Weighted average interest rate		0.20%		2.00%

Capitalization - Additional Inf

Capitalization - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended
Capitalization - Additional Information (Details) - USD ($)	Jan. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019
Schedule of Capitalization [Line Items]
Number of shares of common stock issued	1,050,000
Value of common stock issued	$ 88,000,000	$ 0	$ 88,000,000	$ 400,000,000	$ 425,000,000
PG&E Project
Schedule of Capitalization [Line Items]
Short-term debt						$ 1,001,000,000
Long-term debt		$ 898,000,000
Debentures \| 3.35% Debentures Due 2030 \| CECONY
Schedule of Capitalization [Line Items]
Face amount of debt			$ 600,000,000
Interest rate			3.35%
Debentures \| 3.95% Debentures Due 2050 \| CECONY
Schedule of Capitalization [Line Items]
Face amount of debt			$ 1,000,000,000
Interest rate			3.95%

Capitalization - Carrying Amoun

Capitalization - Carrying Amounts and Fair Values of Long-Term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Unamortized debt expense	$ 196	$ 178
Carrying Amount
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	21,114	19,973
Fair Value
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	25,183	22,738
CECONY
Debt Instrument [Line Items]
Unamortized debt discount	170	151
CECONY \| Carrying Amount
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	16,194	14,964
CECONY \| Fair Value
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	$ 20,001	$ 17,505

Pension Benefits - Total Period

Pension Benefits - Total Periodic Benefit Costs (Details) - Pension Benefits - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost – including administrative expenses	$ 73	$ 62	$ 147	$ 125
Interest cost on projected benefit obligation	137	150	275	301
Expected return on plan assets	(258)	(247)	(517)	(494)
Recognition of net actuarial loss	175	130	349	259
Recognition of prior service credit	(4)	(4)	(8)	(9)
TOTAL PERIODIC BENEFIT COST	123	91	246	182
Cost capitalized	(33)	(29)	(64)	(55)
Reconciliation to rate level	(62)	(2)	(126)	(7)
Total credit recognized	28	60	56	120
CECONY
Defined Benefit Plan Disclosure [Line Items]
Service cost – including administrative expenses	69	58	137	117
Interest cost on projected benefit obligation	129	141	258	282
Expected return on plan assets	(245)	(234)	(490)	(468)
Recognition of net actuarial loss	165	123	331	246
Recognition of prior service credit	(5)	(5)	(10)	(10)
TOTAL PERIODIC BENEFIT COST	113	83	226	167
Cost capitalized	(32)	(27)	(61)	(52)
Reconciliation to rate level	(59)	(1)	(121)	(6)
Total credit recognized	$ 22	$ 55	$ 44	$ 109

Pension Benefits - Additional I

Pension Benefits - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)
CECONY
Defined Benefit Plan Disclosure [Line Items]
Contributions	$ 78
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions	474
Contributions	79
Pension Benefits \| CECONY
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions	434
Contributions	$ 18

Environmental Matters - Accrued

Environmental Matters - Accrued Liabilities and Regulatory Assets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Site Contingency [Line Items]
Accrued liabilities	$ 734	$ 734
Regulatory assets	4,723	4,987
Manufactured gas plant sites
Site Contingency [Line Items]
Accrued liabilities	633	640
Other Superfund Sites
Site Contingency [Line Items]
Accrued liabilities	101	94
Superfund Sites
Site Contingency [Line Items]
Accrued liabilities	734	734
Regulatory assets	729	732
CECONY
Site Contingency [Line Items]
Accrued liabilities	654	654
Regulatory assets	4,349	4,600
CECONY \| Manufactured gas plant sites
Site Contingency [Line Items]
Accrued liabilities	554	561
CECONY \| Other Superfund Sites
Site Contingency [Line Items]
Accrued liabilities	100	93
CECONY \| Superfund Sites
Site Contingency [Line Items]
Accrued liabilities	654	654
Regulatory assets	$ 648	$ 647

Environmental Matters - Environ

Environmental Matters - Environmental Remediation Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Environmental Exit Cost [Line Items]
Remediation costs incurred	$ 3	$ 8	$ 8	$ 11
CECONY
Environmental Exit Cost [Line Items]
Remediation costs incurred	$ 3	$ 6	$ 8	$ 8

Environmental Matters - Additio

Environmental Matters - Additional Information (Details) - USD ($) $ in Billions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
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, 2020	Dec. 31, 2019
Site Contingency [Line Items]
Regulatory assets	$ 4,723	$ 4,987
Asbestos Suits
Site Contingency [Line Items]
Accrued liability	8	8
Regulatory assets	8	8
Workers’ Compensation
Site Contingency [Line Items]
Accrued liability	75	78
Regulatory assets	0	3
CECONY
Site Contingency [Line Items]
Regulatory assets	4,349	4,600
CECONY \| Asbestos Suits
Site Contingency [Line Items]
Accrued liability	7	7
Regulatory assets	7	7
CECONY \| Workers’ Compensation
Site Contingency [Line Items]
Accrued liability	70	73
Regulatory assets	$ 0	$ 3

Other Material Contingencies -

Other Material Contingencies - Manhattan Explosion and Fire (Details) $ in Millions	Mar. 12, 2014peoplebuilding	Feb. 28, 2017USD ($)	Jun. 30, 2020USD ($)lawsuit	Dec. 31, 2019USD ($)
Loss Contingencies [Line Items]
Accrued regulatory liability			$ 4,652	$ 4,827
Settlement of Gas Proceedings
Loss Contingencies [Line Items]
Accrued regulatory liability			$ 22	$ 10
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 - Guarantees (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Guarantor Obligations [Line Items]
Total guarantees, by type and term	$ 1,944	$ 1,831
Con Edison Transmission
Guarantor Obligations [Line Items]
Total guarantees, by type and term	548
Energy transactions
Guarantor Obligations [Line Items]
Total guarantees, by type and term	728
Renewable electric production projects
Guarantor Obligations [Line Items]
Total guarantees, by type and term	598
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	1,086
0 – 3 years \| Con Edison Transmission
Guarantor Obligations [Line Items]
Total guarantees, by type and term	362
0 – 3 years \| Energy transactions
Guarantor Obligations [Line Items]
Total guarantees, by type and term	447
0 – 3 years \| Renewable electric production projects
Guarantor Obligations [Line Items]
Total guarantees, by type and term	207
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	243
4 – 10 years \| Con Edison Transmission
Guarantor Obligations [Line Items]
Total guarantees, by type and term	186
4 – 10 years \| Energy transactions
Guarantor Obligations [Line Items]
Total guarantees, by type and term	48
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	615
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	233
Greater than 10 years \| Renewable electric production projects
Guarantor Obligations [Line Items]
Total guarantees, by type and term	382
Greater than 10 years \| Other
Guarantor Obligations [Line Items]
Total guarantees, by type and term	$ 0

Other Material Contingencies _3

Other Material Contingencies - Con Edison Transmission (Details) - Payment Guarantee by CET Electric of Contributions to New York Transco LLC	6 Months Ended
	Jun. 30, 2020
Guarantor Obligations [Line Items]
Estimated project cost percentage	175.00%
NY Transco
Guarantor Obligations [Line Items]
Ownership interest, percentage	45.70%

Other Material Contingencies _4

Other Material Contingencies - Other (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Guarantor Obligations [Line Items]
Guarantee obligations maximum exposure	$ 1,944	$ 1,831
Financial Guarantee for Indemnity Agreements for Surety Bonds
Guarantor Obligations [Line Items]
Guarantee obligations maximum exposure	$ 70

Leases - Additional Information

Leases - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Assets under finance leases	$ 3	$ 3	$ 1
Finance leases, accumulated amortization	3	3	5
Right-of-use assets	5	5
CECONY
Lessee, Lease, Description [Line Items]
Assets under finance leases	2	2
Finance leases, accumulated amortization	1	1	$ 3
Right-of-use assets	$ 1	$ 1

Leases - Lease Cost and Cash Fl

Leases - Lease Cost and Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 21	$ 21	$ 42	$ 41
Operating lease cash flows	8	9	16	17
CECONY
Lessee, Lease, Description [Line Items]
Operating lease cost	16	16	32	32
Operating lease cash flows	$ 4	$ 4	$ 8	$ 8

Leases - Other Related Informat

Leases - Other Related Information (Details)	Jun. 30, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term, Operating leases	19 years 2 months 12 days	19 years 9 months 18 days
Weighted Average Remaining Lease Term, Finance leases	7 years 6 months	12 years 2 months 12 days
Weighted Average Discount Rate, Operating leases	4.30%	4.30%
Weighted Average Discount Rate, Finance leases	1.80%	3.50%
CECONY
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term, Operating leases	13 years 6 months	14 years
Weighted Average Remaining Lease Term, Finance leases	4 years 4 months 24 days	2 years 4 months 24 days
Weighted Average Discount Rate, Operating leases	3.60%	3.60%
Weighted Average Discount Rate, Finance leases	1.40%	4.10%

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Operating Leases
2021	$ 80
2022	76
2023	73
2024	73
2025	74
All years thereafter	993
Total future minimum lease payments	1,369
Less: imputed interest	(475)
Total	894
Operating lease liabilities (current)	83	$ 65
Operating lease liabilities (noncurrent)	811	809
Total	894
Finance Leases
2021	1
2022	1
2023	0
2024	0
2025	0
All years thereafter	1
Total future minimum lease payments	3
Less: imputed interest	0
Other noncurrent liabilities	2
Other current liabilities	1
Total	3
CECONY
Operating Leases
2021	60
2022	57
2023	56
2024	56
2025	57
All years thereafter	504
Total future minimum lease payments	790
Less: imputed interest	(167)
Total	623
Operating lease liabilities (current)	64	54
Operating lease liabilities (noncurrent)	559	$ 551
Total	623
Finance Leases
2021	1
2022	1
2023	0
2024	0
2025	0
All years thereafter	0
Total future minimum lease payments	2
Less: imputed interest	0
Other noncurrent liabilities	1
Other current liabilities	1
Total	$ 2

Income Tax - Additional Informa

Income Tax - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Taxes Disclosure [Line Items]
Income tax expense	$ 9	$ 19	$ 64	$ 127
Income tax benefit due to ability to carryback a NOL under the CARES Act			4
Estimated liability for uncertain tax positions	13		13
Effective income tax rate reconciliation, uncertainty of taxes			1
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate	13		13
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate, net of federal taxes	12		12
CECONY
Income Taxes Disclosure [Line Items]
Income tax expense	7	$ 27	102	$ 151
Estimated liability for uncertain tax positions	3		3
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate	3		3
Tax Year 2018 to 2013
Income Taxes Disclosure [Line Items]
Operating loss carryback			29
Net tax refund	2.5		$ 2.5
Tax Year 2013
Income Taxes Disclosure [Line Items]
Discrete income tax benefit	$ 4

Income Tax - Income Tax Reconci

Income Tax - Income Tax Reconciliation (Details)	3 Months Ended		6 Months Ended
Income Tax - Income Tax Reconciliation (Details)	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
STATUTORY TAX RATE
Federal	21.00%	21.00%	21.00%	21.00%
Changes in computed taxes resulting from:
State income tax	6.00%	6.00%	5.00%	5.00%
Amortization of excess deferred federal income taxes	(20.00%)	(9.00%)	(12.00%)	(4.00%)
Taxes attributable to non-controlling interest	(2.00%)	(4.00%)	(1.00%)	(1.00%)
Cost of removal	4.00%	2.00%	2.00%	1.00%
Other plant-related items	(3.00%)	(1.00%)	(2.00%)	(1.00%)
Allowance for uncollectible accounts	1.00%	0.00%
Renewable energy credits	(4.00%)	(4.00%)	(3.00%)	(2.00%)
Amortization of excess deferred state income taxes	0.00%	(2.00%)	0.00%	(1.00%)
CARES Act NOL carryback			(1.00%)	0.00%
Other	1.00%	1.00%	1.00%	(1.00%)
Effective tax rate	4.00%	10.00%	10.00%	17.00%
CECONY
STATUTORY TAX RATE
Federal	21.00%	21.00%	21.00%	21.00%
Changes in computed taxes resulting from:
State income tax	6.00%	5.00%	5.00%	5.00%
Amortization of excess deferred federal income taxes	(25.00%)	(9.00%)	(12.00%)	(4.00%)
Taxes attributable to non-controlling interest	0.00%	0.00%	0.00%	0.00%
Cost of removal	5.00%	2.00%	2.00%	1.00%
Other plant-related items	(4.00%)	(1.00%)	(2.00%)	0.00%
Allowance for uncollectible accounts	1.00%	0.00%
Renewable energy credits	0.00%	0.00%	0.00%	0.00%
Amortization of excess deferred state income taxes	0.00%	(2.00%)	0.00%	(1.00%)
CARES Act NOL carryback			0.00%	0.00%
Other	0.00%	(1.00%)	1.00%	(1.00%)
Effective tax rate	4.00%	15.00%	15.00%	21.00%

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 2,627	$ 2,604	$ 5,784	$ 5,932
Total revenues	2,719	2,744	5,953	6,258
Other
Disaggregation of Revenue [Line Items]
Total revenues	92	140	169	326
Clean Energy Businesses \| Renewables \| Engineering, procurement and construction
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2	4	4	6
CECONY
Disaggregation of Revenue [Line Items]
Total revenues	2,345	2,331	5,200	5,371
Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	2,719	2,744
Operating Segments \| Electric
Disaggregation of Revenue [Line Items]
Total revenues			5,953	6,258
Operating Segments \| Clean Energy Businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	189	187	314	317
Total revenues	198	233	344	450
Operating Segments \| Clean Energy Businesses \| Other
Disaggregation of Revenue [Line Items]
Total revenues	9	46	30	133
Operating Segments \| Clean Energy Businesses \| Renewables
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	178	171	292	278
Total revenues	178	171	292	278
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	11	16	22	39
Total revenues	11	16	22	39
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	9	46	30	133
Operating Segments \| Clean Energy Businesses \| Other \| Other
Disaggregation of Revenue [Line Items]
Total revenues	9	46	30	133
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	2,261	2,237	5,071	5,177
Total revenues	2,345	2,331	5,200	5,371
Operating Segments \| CECONY \| Other
Disaggregation of Revenue [Line Items]
Total revenues	84	94	129	194
Operating Segments \| CECONY \| Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,781	1,751	3,514	3,465
Total revenues	1,845	1,833	3,616	3,630
Operating Segments \| CECONY \| Electric \| Other
Disaggregation of Revenue [Line Items]
Total revenues	64	82	102	165
Operating Segments \| CECONY \| Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	399	400	1,232	1,310
Total revenues	416	408	1,250	1,330
Operating Segments \| CECONY \| Gas \| Other
Disaggregation of Revenue [Line Items]
Total revenues	17	8	18	20
Operating Segments \| CECONY \| Steam
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	81	86	325	402
Total revenues	84	90	334	411
Operating Segments \| CECONY \| Steam \| Other
Disaggregation of Revenue [Line Items]
Total revenues	3	4	9	9
Operating Segments \| O&R
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	176	179	397	436
Total revenues	175	179	408	437
Operating Segments \| O&R \| Other
Disaggregation of Revenue [Line Items]
Total revenues	(1)	0	11	1
Operating Segments \| O&R \| Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	139	140	267	283
Total revenues	138	138	274	283
Operating Segments \| O&R \| Electric \| Other
Disaggregation of Revenue [Line Items]
Total revenues	(1)	(2)	7	0
Operating Segments \| O&R \| Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	37	39	130	153
Total revenues	37	41	134	154
Operating Segments \| O&R \| Gas \| Other
Disaggregation of Revenue [Line Items]
Total revenues	0	2	4	1
Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers			0	0
Total revenues	$ 0	$ 0	(1)	(2)
Other \| Other
Disaggregation of Revenue [Line Items]
Total revenues			$ (1)	$ (2)

Revenue Recognition - Change in

Revenue Recognition - Change in Unbilled Contract and Unearned Revenues (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jan. 01, 2020	Jan. 01, 2019
Unbilled contract revenue
Beginning balance	$ 29	$ 29
Additions	58	44
Subtractions	65	38
Ending balance	22	35
Unearned revenue
Beginning balance	17	20
Additions	31	0
Subtractions	1	2
Ending balance	$ 47	$ 18
Contracts with customer, revenue recognized, amount outstanding end of last period			$ 1	$ 2

Revenue Recognition - Revenue R

Revenue Recognition - Revenue Recognition, Remaining Performance Obligation (Details) $ in Millions	Jun. 30, 2020USD ($)
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 70
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 34
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]: 2022-04-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 36
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction

Revenue Recognition - Additiona

Revenue Recognition - Additional information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Late fee and other fees not collected	$ 21	$ 24
CECONY
Disaggregation of Revenue [Line Items]
Late fee and other fees not collected	$ 20	$ 23

Financial Information by Busi_3

Financial Information by Business Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 2,719	$ 2,744	$ 5,953	$ 6,258
Depreciation and amortization	476	418	946	831
Operating income/(loss)	479	458	1,287	1,244
Clean Energy Businesses
Segment Reporting Information [Line Items]
Depreciation and amortization	57	58	115	116
Operating income/(loss)	82	72	96	83
Con Edison Transmission
Segment Reporting Information [Line Items]
Depreciation and amortization	0	0	0	0
Operating income/(loss)	(1)	(2)	(3)	(3)
Electric
Segment Reporting Information [Line Items]
Depreciation and amortization			946	831
Operating income/(loss)			1,287	1,244
CECONY
Segment Reporting Information [Line Items]
Total revenues	2,345	2,331	5,200	5,371
Depreciation and amortization	396	339	786	673
Operating income/(loss)	389	376	1,132	1,101
CECONY \| Electric
Segment Reporting Information [Line Items]
Depreciation and amortization	301	261	598	518
Operating income/(loss)	318	314	600	571
CECONY \| Gas
Segment Reporting Information [Line Items]
Depreciation and amortization	72	56	143	111
Operating income/(loss)	105	94	474	438
CECONY \| Steam
Segment Reporting Information [Line Items]
Depreciation and amortization	23	22	45	44
Operating income/(loss)	(34)	(32)	58	92
O&R
Segment Reporting Information [Line Items]
Depreciation and amortization	23	21	45	42
Operating income/(loss)	10	13	65	67
O&R \| Electric
Segment Reporting Information [Line Items]
Depreciation and amortization	16	15	32	30
Operating income/(loss)	13	16	27	31
O&R \| Gas
Segment Reporting Information [Line Items]
Depreciation and amortization	7	6	13	12
Operating income/(loss)	(3)	(3)	38	36
Operating segment
Segment Reporting Information [Line Items]
Total revenues	2,719	2,744
Operating segment \| Clean Energy Businesses
Segment Reporting Information [Line Items]
Total revenues	198	233	344	450
Operating segment \| Con Edison Transmission
Segment Reporting Information [Line Items]
Total revenues	1	1	2	2
Operating segment \| Electric
Segment Reporting Information [Line Items]
Total revenues			5,953	6,258
Operating segment \| CECONY
Segment Reporting Information [Line Items]
Total revenues	2,345	2,331	5,200	5,371
Operating segment \| CECONY \| Electric
Segment Reporting Information [Line Items]
Total revenues	1,845	1,833	3,616	3,630
Operating segment \| CECONY \| Gas
Segment Reporting Information [Line Items]
Total revenues	416	408	1,250	1,330
Operating segment \| CECONY \| Steam
Segment Reporting Information [Line Items]
Total revenues	84	90	334	411
Operating segment \| O&R
Segment Reporting Information [Line Items]
Total revenues	175	179	408	437
Operating segment \| O&R \| Electric
Segment Reporting Information [Line Items]
Total revenues	138	138	274	283
Operating segment \| O&R \| Gas
Segment Reporting Information [Line Items]
Total revenues	37	41	134	154
Other
Segment Reporting Information [Line Items]
Total revenues	0	0	(1)	(2)
Depreciation and amortization	0	0	0	0
Operating income/(loss)	(1)	(1)	(3)	(4)
Inter-segment \| Electric
Segment Reporting Information [Line Items]
Total revenues			0	0
Inter-segment \| CECONY
Segment Reporting Information [Line Items]
Total revenues	(25)	(23)	(50)	(47)
Inter-segment \| CECONY \| Electric
Segment Reporting Information [Line Items]
Total revenues	4	5	9	9
Inter-segment \| CECONY \| Gas
Segment Reporting Information [Line Items]
Total revenues	2	2	3	3
Inter-segment \| CECONY \| Steam
Segment Reporting Information [Line Items]
Total revenues	$ 19	$ 16	$ 38	$ 35

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair value of derivative assets
Net Amounts of Assets/ (Liabilities)	$ 592	$ 550
Fair value of derivative liabilities
Net Amounts of Assets/ (Liabilities)	(412)	(229)
Net fair value derivative assets/(liabilities)
Gross Amounts of Recognized Assets/(Liabilities)	(320)	(183)
Gross Amounts Offset	1	17
Net Amounts of Assets/ (Liabilities)	(319)	(166)
Margin deposits	7	9
Interest Rate Swap
Fair value of derivative assets
Net Amounts of Assets/ (Liabilities)	0	1
Fair value of derivative liabilities
Net Amounts of Assets/ (Liabilities)	(130)	(41)
CECONY
Fair value of derivative assets
Net Amounts of Assets/ (Liabilities)	495	498
Net fair value derivative assets/(liabilities)
Gross Amounts of Recognized Assets/(Liabilities)	(177)	(124)
Gross Amounts Offset	3	17
Net Amounts of Assets/ (Liabilities)	(174)	(107)
Margin deposits	6	8
Clean Energy Businesses \| Interest Rate Swap
Net fair value derivative assets/(liabilities)
Notional amount	892	919
Fair Value of Derivative Liabilities, Current
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(137)	(140)
Gross Amounts Offset	(33)	17
Net Amounts of Assets/ (Liabilities)	(170)	(123)
Fair Value of Derivative Liabilities, Current \| Interest Rate Swap
Fair value of derivative liabilities
Net Amounts of Assets/ (Liabilities)	(21)	(7)
Fair Value of Derivative Liabilities, Current \| CECONY
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(93)	(100)
Gross Amounts Offset	24	19
Net Amounts of Assets/ (Liabilities)	(69)	(81)
Fair Value of Derivative Liabilities, Noncurrent
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(255)	(122)
Gross Amounts Offset	13	16
Net Amounts of Assets/ (Liabilities)	(242)	(106)
Fair Value of Derivative Liabilities, Noncurrent \| Interest Rate Swap
Fair value of derivative liabilities
Net Amounts of Assets/ (Liabilities)	(108)	(34)
Fair Value of Derivative Liabilities, Noncurrent \| CECONY
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(138)	(80)
Gross Amounts Offset	10	16
Net Amounts of Assets/ (Liabilities)	(128)	(64)
Fair Value of Derivative Liabilities
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(392)	(262)
Gross Amounts Offset	(20)	33
Net Amounts of Assets/ (Liabilities)	(412)	(229)
Fair Value of Derivative Liabilities \| CECONY
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(231)	(180)
Gross Amounts Offset	34	35
Net Amounts of Assets/ (Liabilities)	(197)	(145)
Fair Value of Derivative Assets, Current
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	57	60
Gross Amounts Offset	32	(3)
Net Amounts of Assets/ (Liabilities)	89	57
Fair Value of Derivative Assets, Current \| CECONY
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	41	39
Gross Amounts Offset	(22)	(6)
Net Amounts of Assets/ (Liabilities)	19	33
Fair Value of Derivative Assets, Noncurrent
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	15	19
Gross Amounts Offset	(11)	(13)
Net Amounts of Assets/ (Liabilities)	4	6
Fair Value of Derivative Assets, Noncurrent \| Interest Rate Swap
Fair value of derivative assets
Net Amounts of Assets/ (Liabilities)		1
Fair Value of Derivative Assets, Noncurrent \| CECONY
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	13	17
Gross Amounts Offset	(9)	(12)
Net Amounts of Assets/ (Liabilities)	4	5
Fair Value of Derivative Assets
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	72	79
Gross Amounts Offset	21	(16)
Net Amounts of Assets/ (Liabilities)	93	63
Fair Value of Derivative Assets \| CECONY
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	54	56
Gross Amounts Offset	(31)	(18)
Net Amounts of Assets/ (Liabilities)	$ 23	$ 38

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	$ (8)	$ (18)	$ (6)	$ (20)
Total deferred gains/(losses)	(22)	(151)	(176)	(198)
Net deferred gains/(losses)	(30)	(169)	(182)	(218)
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	(1)	(17)	(92)	(20)
Gas purchased for resale
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income			(3)	(2)
Non-utility revenue
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	1	7	5	15
Other operations and maintenance expense
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	2	0	(5)	1
Other interest expense
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	(4)	(24)	(89)	(34)
Deferred Derivative Gains, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(2)	(16)	(3)	(12)
Deferred Derivative Gains, Noncurrent
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(6)	(2)	(3)	(8)
Deferred Derivative Losses, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	36	(36)	22	(39)
Recoverable Energy Costs, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(45)	(41)	(140)	(59)
Deferred Derivative Losses, Noncurrent
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(13)	(74)	(58)	(100)
CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(8)	(15)	(6)	(17)
Total deferred gains/(losses)	(23)	(139)	(164)	(180)
Net deferred gains/(losses)	(31)	(154)	(170)	(197)
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	2	0	(5)	1
CECONY \| Gas purchased for resale
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income			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 operations and maintenance expense
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	2	0	(5)	1
CECONY \| Other interest expense
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	0	0	0	0
CECONY \| Deferred Derivative Gains, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(2)	(15)	(3)	(11)
CECONY \| Deferred Derivative Gains, Noncurrent
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(6)	0	(3)	(6)
CECONY \| Deferred Derivative Losses, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	32	(34)	20	(34)
CECONY \| Recoverable Energy Costs, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(40)	(37)	(126)	(51)
CECONY \| Deferred Derivative Losses, Noncurrent
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	$ (15)	$ (68)	$ (58)	$ (95)

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Hedged Volume of Derivative Transactions (Details)	Jun. 30, 2020MWMWhgalMMBTU
Electric Energy
Derivatives, Fair Value [Line Items]
Notional amount \| MWh	33,140,975
Capacity
Derivatives, Fair Value [Line Items]
Notional amount \| MW	39,561
Natural Gas
Derivatives, Fair Value [Line Items]
Notional amount \| MMBTU	286,817,088
Refined Fuels
Derivatives, Fair Value [Line Items]
Notional amount \| gal	9,744,000
CECONY \| Electric Energy
Derivatives, Fair Value [Line Items]
Notional amount \| MWh	30,767,675
CECONY \| Capacity
Derivatives, Fair Value [Line Items]
Notional amount \| MW	33,900
CECONY \| Natural Gas
Derivatives, Fair Value [Line Items]
Notional amount \| MMBTU	268,660,000
CECONY \| Refined Fuels
Derivatives, Fair Value [Line Items]
Notional amount \| gal	9,744,000

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)
Investment Holdings [Line Items]
Energy supply and hedging activities credit exposure total	$ 222
Makeup of net credit exposure non-investment grade/non-rated counterparties	57
Makeup of net credit exposure independent system operators	94
Makeup of net credit exposure with investment-grade counterparties	57
Makeup of net credit exposure with commodity exchange brokers	14
CECONY
Investment Holdings [Line Items]
Energy supply and hedging activities credit exposure total	19
Makeup of net credit exposure with investment-grade counterparties	9
Makeup of net credit exposure with commodity exchange brokers	$ 10

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities - Credit-Risk-Related Contingent Features (Details) $ in Millions	Jun. 30, 2020USD ($)
Derivatives, Fair Value [Line Items]
Aggregate fair value – net liabilities	$ 195
Collateral posted	123
Additional collateral for non-derivative transactions without extended unsecured credit	20
Downgrade One Level from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	15
Downgrade to Below Investment Grade from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	84
Derivatives in net asset position additional collateral	37
CECONY
Derivatives, Fair Value [Line Items]
Aggregate fair value – net liabilities	179
Collateral posted	111
CECONY \| Downgrade One Level from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	9
CECONY \| Downgrade to Below Investment Grade from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	$ 67

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 550		$ 592
Derivative liabilities	229		412
CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	498		495
Netting Adjustment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	4		41
Derivative liabilities	(22)		33
Netting Adjustment \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		(15)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	357		389
Derivative liabilities	18		12
Level 1 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	336		367
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	187		160
Derivative liabilities	215		351
Level 2 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	161		142
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2		2
Derivative liabilities	18		16
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	71		101
Derivative liabilities	188		282
Transfer out of level 3	24
Commodity \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	46		28
Derivative liabilities	145		197
Transfer out of level 3	22	$ 2
Commodity \| Netting Adjustment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	4		41
Derivative liabilities	(22)		33
Commodity \| Netting Adjustment \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		(15)
Derivative liabilities	(24)		(22)
Commodity \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	4		14
Derivative liabilities	18		12
Commodity \| Level 1 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	3		11
Derivative liabilities	15		10
Commodity \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	61		44
Derivative liabilities	174		221
Commodity \| Level 2 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	42		31
Derivative liabilities	147		201
Commodity \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2		2
Derivative liabilities	18		16
Commodity \| Level 3 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	1		1
Derivative liabilities	7		8
Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	1		0
Derivative liabilities	41		130
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	1		0
Derivative liabilities	41		130
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	478		491
Other \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	452		467
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	353		375
Other \| Level 1 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	333		356
Other \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	125		116
Other \| Level 2 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	119		111
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, 2020USD ($)$ / MWh$ / kW-month	Dec. 31, 2019USD ($)
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ 592	$ 550
CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	495	498
Level 3
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	2	2
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	$ (1)
Level 3 \| Electricity \| Forward energy prices \| Minimum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / MWh	21
Level 3 \| Electricity \| Forward energy prices \| Maximum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / MWh	62.76
Level 3 \| Electricity \| Forward energy prices \| CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (1)
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	23.02
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	62.76
Level 3 \| Electricity \| Forward capacity prices
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (14)
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	0.30
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	8.75
Level 3 \| Electricity \| Forward capacity prices \| CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (7)
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	0.30
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	8.62
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	(24.58)
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	46.10
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	0.32
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	1.51
Level 3 \| Commodity
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (14)
Level 3 \| Commodity \| CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (7)

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (13)	$ (19)	$ (16)	$ (13)	$ (13)
Included in earnings	(2)	0	(7)	(4)
Included in regulatory assets and liabilities	0	(27)	1	(31)
Settlements	1	0	8	2
Ending balance	(14)	(46)	(14)	(46)	(16)
CECONY
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(6)	(5)	(6)	(2)	(2)
Included in earnings	(1)	1	(3)	1
Included in regulatory assets and liabilities	1	(25)	(1)	(28)
Settlements	(1)	(1)	3	(1)
Ending balance	$ (7)	$ (30)	$ (7)	$ (30)	$ (6)

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Clean Energy Businesses \| Non-utility revenue
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	$ 1	$ 1	$ 1	$ 1

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, 2020USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	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)	$ 4		$ (10)
Income (loss) before tax	$ 3		$ (8)
Con Edison Development \| Texas Solar 4
Variable Interest Entity [Line Items]
Percentage of variable interests (less than)					80.00%
Ownership percentage acquired	20.00%		20.00%
Con Edison Development \| Tax Equity Projects
Variable Interest Entity [Line Items]
Percentage of variable interests (less than)			100.00%
Net income (loss)		$ (15)		$ (34)
Income (loss) before tax		(12)		(26)
Tax Equity Investors \| Tax Equity Projects
Variable Interest Entity [Line Items]
Net income (loss)	$ 12	28	$ 29	49
Income (loss) before tax	$ 9	$ 21	$ 22	$ 37

Variable Interest Entities - Ne

Variable Interest Entities - Net Assets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Noncontrolling interest	$ 216	$ 191
Great Valley Solar
Variable Interest Entity [Line Items]
Non-utility property, less accumulated depreciation	288	293
Other assets	45	40
Total assets	333	333
Other liabilities	15	17
Total liabilities	15	17
Accumulated depreciation	13	9
Great Valley Solar \| Tax Equity Investors
Variable Interest Entity [Line Items]
Noncontrolling interest	73	62
Copper Mountain - Mesquite Solar
Variable Interest Entity [Line Items]
Non-utility property, less accumulated depreciation	453	461
Other assets	189	128
Total assets	642	589
Other liabilities	69	18
Total liabilities	69	18
Accumulated depreciation	23	15
Copper Mountain - Mesquite Solar \| Tax Equity Investors
Variable Interest Entity [Line Items]
Noncontrolling interest	$ 140	$ 126

Other Postretirement Benefits	6 Months Ended
Other Postretirement Benefits	Jun. 30, 2020
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, 2020 and 2019 were as follows: For the Three Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Service cost $5 $4 $4 $3 Interest cost on accumulated other postretirement benefit obligation 9 11 8 9 Expected return on plan assets (16) (16) (14) (14) Recognition of net actuarial loss/(gain) 3 (2) 3 (2) Recognition of prior service credit (1) (1) — — TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT) $— $(4) $1 $(4) Cost capitalized (2) (2) (2) (2) Reconciliation to rate level 2 3 — 2 Total credit recognized $— $(3) $(1) $(4) For the Six Months Ended June 30, Con Edison CECONY (Millions of Dollars) 2020 2019 2020 2019 Service cost $11 $9 $8 $6 Interest cost on accumulated other postretirement benefit obligation 19 22 16 18 Expected return on plan assets (33) (33) (27) (27) Recognition of net actuarial loss/(gain) 30 (4) 29 (5) Recognition of prior service credit (2) (2) (1) (1 ) TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT) $25 $(8) $25 $(9) Cost capitalized (5) (4) (3) (3) Reconciliation to rate level (20) 7 (24) 4 Total credit recognized $— $(5) $(2) $(8) For information about the presentation of the components of other postretirement benefit costs, see Note E. Expected Contributions Based on estimates as of June 30, 2020 , Con Edison and CECONY expect to make a contribution of $3 million (all of which is to be made by CECONY) to the other postretirement benefit plans in 2020 . The Companies' policy is to fund the total periodic benefit cost of the plans to the extent tax deductible.

Consolidated Edison (ED) 10-Q6 Aug 202020 Q2 Quarterly reportFinancial data

Cover Page

Consolidated Income Statement (

Consolidated Statement of Compr

Consolidated Statement of Cash

Consolidated Balance Sheet (Una

Consolidated Balance Sheet (U_2

Consolidated Statement of Equit

Consolidated Statement of Equ_2

General

Summary of Significant Accounti

Regulatory Matters

Capitalization

Short-Term Borrowing

Pension Benefits

Other Postretirement Benefits

Environmental Matters

Other Material Contingencies

Leases

Income Tax

Revenue Recognition

Financial Information by Busine

Derivative Instruments and Hedg

Fair Value Measurements

Variable Interest Entities

New Financial Accounting Standa

Summary of Significant Accoun_2

Summary of Significant Accoun_3

Regulatory Matters (Tables)

Capitalization (Tables)

Pension Benefits (Tables)

Other Postretirement Benefits (

Environmental Matters (Tables)

Other Material Contingencies (T

Leases (Tables)

Income Tax (Tables)

Revenue Recognition (Tables)

Financial Information by Busi_2

Derivative Instruments and He_2

Fair Value Measurements (Tables

Variable Interest Entities (Tab

General (Details)

Summary of Significant Accoun_4

Summary of Significant Accoun_5

Summary of Significant Accoun_6

Summary of Significant Accoun_7

Summary of Significant Accoun_8

Summary of Significant Accoun_9

Regulatory Matters - COVID-19 R

Regulatory Matters - Other Regu

Regulatory Matters - Regulatory

Regulatory Matters - Regulato_2

Short-Term Borrowing (Details)

Capitalization - Additional Inf

Capitalization - Carrying Amoun

Pension Benefits - Total Period

Pension Benefits - Additional I

Other Postretirement Benefits -

Other Postretirement Benefits_2

Environmental Matters - Accrued

Environmental Matters - Environ

Environmental Matters - Additio

Environmental Matters - Accru_2

Other Material Contingencies -

Other Material Contingencies _2

Other Material Contingencies _3

Other Material Contingencies _4

Leases - Additional Information

Leases - Lease Cost and Cash Fl

Leases - Other Related Informat

Leases - Future Minimum Lease P

Income Tax - Additional Informa

Income Tax - Income Tax Reconci

Revenue Recognition - Disaggreg

Revenue Recognition - Change in

Revenue Recognition - Revenue R

Revenue Recognition - Additiona

Financial Information by Busi_3

Derivative Instruments and He_3

Derivative Instruments and He_4