Equity Method Investment, Project Percent Completion

No definition available.

Name:	ed_EquityMethodInvestmentProjectPercentCompletion
Namespace Prefix:	ed_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Equity Method Investments, Ownership Percentage, Expected Percentage

+ References

No definition available.

+ Details

Name:	ed_EquityMethodInvestmentsOwnershipPercentageExpectedPercentage
Namespace Prefix:	ed_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Deferred Projects

+ References

No definition available.

+ Details

Name:	ed_NumberOfDeferredProjects
Namespace Prefix:	ed_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Miles In Pipeline Construction

+ References

No definition available.

+ Details

Name:	ed_NumberOfMilesInPipelineConstruction
Namespace Prefix:	ed_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

+ Details

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(10))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8813-108599

+ Details

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

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

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ed_MountainValleyPipelineLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	srt_OwnershipAxis=ed_MountainValleyPipelineLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ed_BrokenBowIIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ed_ElectricEnergyDerivativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Summary of Significant Accounting Policies and Other Matters - Narrative (Details) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2016 mi	Mar. 31, 2023 project shares	Mar. 31, 2022 shares	Mar. 01, 2023 project	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Antidilutive shares (in shares) \| shares		1.9	0.0
Mountain Valley Pipeline LLC \| Con Edison Gas Pipeline and Storage, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage		9.50%				10.20%	11.30%
Number of miles in pipeline construction \| mi	300
Equity method investments \| $								$ 530
Equity method investment, ownership percentage, expected percentage		0.08
Equity method investment, project percent completion		94.00%			94.00%
Mountain Valley Pipeline LLC \| Con Edison Gas Pipeline and Storage, LLC \| Mountain Valley Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	12.50%
Broken Bow II \| Clean Energy Businesses \| Electric Energy (MWh)
Schedule of Equity Method Investments [Line Items]
Deferred projects \| project		1		1