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Electricity Purchase Agreements - Summary of Capacity, Energy and Other Fixed Payments (Details) - CECONY - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | $ 159 | $ 139 | $ 231
Astoria Generating Company |  |  |
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | 20 | 26 | 116
Brooklyn Navy Yard |  |  |
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | $ 139 | $ 113 | $ 115

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

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

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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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

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