XML 141 R112.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Material Contingencies - Con Edison Transmission (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Guarantor Obligations [Line Items] |  |
Guarantee obligations maximum exposure | $ 2,157 | $ 2,042
Payment Guarantee by CET Electric of Contributions to New York Transco LLC |  |
Guarantor Obligations [Line Items] |  |
Estimated project cost percentage | 175.00% |
Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Guarantee obligations maximum exposure | $ 490 |
NY Transco | Payment Guarantee by CET Electric of Contributions to New York Transco LLC |  |
Guarantor Obligations [Line Items] |  |
Ownership interest, percentage | 45.70% |

X
- Definition Percentage of estimated costs on projects. + References No definition available. + Details
Name: | ed_PercentageOfEstimatedCostsOnProjects
Namespace Prefix: | ed_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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_GuaranteeObligationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=ed_PaymentGuaranteebyCETElectricofContributionstoNewYorkTranscoLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=ed_ConEdisonTransmissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=ed_NYTranscoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |