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v3.20.4

Revenue Recognition - Additional information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items] |
Late fee and other fees not collected | $ 64
CECONY |
Disaggregation of Revenue [Line Items] |
Late fee and other fees not collected | $ 61

X
- Definition Late Fee Income and Other Fees Not Collected + References No definition available. + Details
Name: | ed_LateFeeIncomeandOtherFeesNotCollected
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
Name: | us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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