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Capitalization - Dividends (Details) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Percentage limitation for income available for dividends (not more than) | 100.00%
Rolling average calculation of income available for dividends (years) | 2 years

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- Definition Percentage limitation for income available for dividends + References No definition available. + Details
Name: | ed_PercentageLimitationForIncomeAvailableForDividends
Namespace Prefix: | ed_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Rolling average calculation of income available for dividends + References No definition available. + Details
Name: | ed_RollingAverageCalculationOfIncomeAvailableForDividends
Namespace Prefix: | ed_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration