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v3.19.3.a.u2

Capitalization - Dividends (Details) | 12 Months Ended
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Dec. 31, 2019
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

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

X
- 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

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