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v3.21.1

Revenue Recognition - Additional information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Late fee and other fees not collected | $ 18 |
CECONY |  |
Disaggregation of Revenue [Line Items] |  |
Late fee and other fees not collected | $ 17 |
O&R | COVID-19 |  |
Disaggregation of Revenue [Line Items] |  |
Late payment charges and fees |  | $ 52
Late payment charges and fees, surcharge recovery period | 12 months |

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

X
- Definition Revenue From Contract With Customer, Late Payment Charges And Fees, Surcharge Recovery Period + References No definition available. + Details
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Namespace Prefix: | ed_
Data Type: | xbrli:durationItemType
Balance Type: | na
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X
- Definition Revenue From Contracts With Customer, Late Payment Charges And Fees + 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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- Details
Name: | dei_LegalEntityAxis=ed_ConsolidatedEdisonCompanyofNewYorkInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=ed_OrangeAndRocklandUtilitiesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |