Contract With Customer, Cost Of Program, Recovery Period

No definition available.

Name:	ed_ContractWithCustomerCostOfProgramRecoveryPeriod
Namespace Prefix:	ed_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Contract With Customer, Cost Of the Program

+ References

No definition available.

+ Details

Name:	ed_ContractWithCustomerCostOftheProgram
Namespace Prefix:	ed_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Contract With Customer, Receivable, Expected Amount

+ References

No definition available.

+ Details

Name:	ed_ContractWithCustomerReceivableExpectedAmount
Namespace Prefix:	ed_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Earnings Adjustment Mechanism, Incentive Revenue

+ References

No definition available.

+ Details

Name:	ed_EarningsAdjustmentMechanismIncentiveRevenue
Namespace Prefix:	ed_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Revenue From Contract With Customer, Estimated Forgone Revenues

+ References

No definition available.

+ Details

Name:	ed_RevenueFromContractWithCustomerEstimatedForgoneRevenues
Namespace Prefix:	ed_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

+ Details

Name:	us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer, when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130533-203044

+ Details

Name:	us-gaap_ContractWithCustomerAssetGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The carrying amount of deferred costs.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCostsCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(5))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

+ Details

Name:	us-gaap_ProvisionForDoubtfulAccounts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=ed_ConsolidatedEdisonCompanyofNewYorkInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ed_OrangeAndRocklandUtilitiesIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=ed_COVID19Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilityAxis=ed_ElectricAndGasTransmissionProjectsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilityAxis=us-gaap_GasTransmissionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=ed_ResidentialCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ed_ProgramAxis=ed_SummerCoolingCreditProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Regulatory Matters - COVID-19 Regulatory Matters (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2020
CECONY
Public Utilities, General Disclosures [Line Items]
Earned EAM incentives			$ 46.0
O&R
Public Utilities, General Disclosures [Line Items]
Earned EAM incentives			3.0
COVID-19
Public Utilities, General Disclosures [Line Items]
Deferred costs		$ 0.3	0.3
COVID-19 \| CECONY
Public Utilities, General Disclosures [Line Items]
Estimated forgone revenues		21.0	1.0
COVID-19 \| CECONY \| Electric and Gas Transmission Projects
Public Utilities, General Disclosures [Line Items]
Reserve adjustments			46.0
Accounts Receivable, Allowance for Credit Loss, Writeoff			8.0
COVID-19 \| O&R
Public Utilities, General Disclosures [Line Items]
Estimated forgone revenues		44.0	2.0
COVID-19 \| O&R \| Gas
Public Utilities, General Disclosures [Line Items]
Reserve adjustments			2.0
Accounts Receivable, Allowance for Credit Loss, Writeoff			1.0
Residential Customers \| COVID-19 \| CECONY
Public Utilities, General Disclosures [Line Items]
Deferred revenue		46.8	46.8
Expected deferred revenue		17.0	17.0
Summer Cooling Credit Program \| Residential Customers \| COVID-19 \| CECONY
Public Utilities, General Disclosures [Line Items]
Expected deferred revenue		$ 63.6	$ 63.6
Cost of the program	$ 70.6
Cost of the program, recovery period			5 years