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Summary of Significant Accounting Policies and Other Matters - Pension and Other Postretirement Benefits (Details) | 12 Months Ended
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Dec. 31, 2024
Accounting Policies [Abstract] |
Investment gains and losses recognized, time period (years) | 15 years
Other actuarial gains and losses recognized, time period (years) | 10 years
Difference between fair value and expected market related value of plan assets (percent) | 20.00%

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- Definition Difference between fair value and expected market related value of plan assets + References No definition available. + Details
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Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Pension actuarial gains and losses recognized time period. + References No definition available. + Details
Name: | ed_PensionActuarialGainsAndLossesRecognizedTimePeriod
Namespace Prefix: | ed_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Pension investment gains and losses recognized time period. + References No definition available. + Details
Name: | ed_PensionInvestmentGainsAndLossesRecognizedTimePeriod
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_AccountingPoliciesAbstract
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