XML 56 R60.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Summary of Significant Accounting Policies and Other Matters - Capitalized Cost of Utility Plant (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | $ 3,562 | $ 3,331
Held for future use | 75 | 76
Construction work in progress | 1,937 | 1,978
NET UTILITY PLANT | 39,751 | 37,580
Electric Generation |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Generation | 591 | 593
Electric Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Transmission | 3,634 | 3,333
Electric Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution | 20,676 | 19,750
General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 43 | 0
Gas |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gas | 8,617 | 7,714
Steam |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Steam | 1,813 | 1,830
General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 2,365 | 2,306
CECONY |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 3,271 | 3,056
Held for future use | 67 | 67
Construction work in progress | 1,812 | 1,850
NET UTILITY PLANT | 37,412 | 35,370
CECONY | Electric Generation |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Generation | 591 | 592
CECONY | Electric Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Transmission | 3,380 | 3,106
CECONY | Electric Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution | 19,602 | 18,716
CECONY | General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 43 | 0
CECONY | Gas |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gas | 7,961 | 7,107
CECONY | Steam |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Steam | 1,813 | 1,830
CECONY | General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | $ 2,143 | $ 2,102

X
- Definition Public Utilities Property Plant And Equipment Steam + References No definition available. + Details
Name: | ed_PublicUtilitiesPropertyPlantAndEquipmentSteam
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Public Utilities, Property, Plant and Equipment, General + References No definition available. + Details
Name: | ed_PublicUtilitiesPropertyPlantandEquipmentGeneral
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Discloses the period end amount of plants held for future use and whether such amount is included in the utility's rate base. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_PlantHeldForFutureUseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to regulated assets common to business units. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentCommon
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of construction work in progress in public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to utility distribution. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDistribution
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to fuels owned by the public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentFuel
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to generation or processing owned by public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of total net PPE. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to utility transmission owned by public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentTransmission
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_ElectricityGenerationPlantNonNuclearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_ElectricTransmissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_ElectricDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=ed_ElectricGeneralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_SteamPlantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=ed_GeneralUtilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ed_ConsolidatedEdisonCompanyofNewYorkInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |