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v3.21.1

General (Details) | 3 Months Ended
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Mar. 31, 2021 subsidiary registrant
Accounting Policies [Abstract] |
Number of registrants | registrant | 2
Number of regulated utility subsidiaries | subsidiary | 2

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- Definition Number of Registrants + References No definition available. + Details
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Namespace Prefix: | ed_
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- Definition Number of Regulated Utility Subsidiaries + References No definition available. + Details
Name: | ed_NumberofRegulatedUtilitySubsidiaries
Namespace Prefix: | ed_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration