XML 135 R110.htm IDEA: XBRL DOCUMENT
v3.20.4

Electricity Purchase Agreements - Summary of Capacity, Energy and Other Fixed Payments (Details) - CECONY - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | $ 139 | $ 231 | $ 318
Indian Point |  |  |
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | 0 | 0 | 6
Astoria Generating Company |  |  |
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | 26 | 116 | 179
Brooklyn Navy Yard |  |  |
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | 113 | 115 | 124
Cogen Technologies |  |  |
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | $ 0 | $ 0 | $ 9

X
- Definition Long-term Contract for Purchase of Capacity and Energy, Amount of Fixed Payments + References No definition available. + Details
Name: | ed_LongtermContractforPurchaseofCapacityandEnergyAmountofFixedPayments
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_LongTermContractForPurchaseOfElectricPowerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_LongTermContractForPurchaseOfElectricPowerAxis=ed_IndianPointMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermContractForPurchaseOfElectricPowerAxis=ed_AstoriaGeneratingCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermContractForPurchaseOfElectricPowerAxis=ed_BrooklynMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermContractForPurchaseOfElectricPowerAxis=ed_CogenTechnologiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |