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Environmental Matters - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
CECONY | Asbestos Proceedings | Subsidiaries |  |
Site Contingency [Line Items] |  |
Estimated undiscounted asbestos liability (years) | 15 years |
Superfund Sites | Manufactured Gas Plant Sites | Maximum |  |
Site Contingency [Line Items] |  |
Estimated aggregate undiscounted potential liability related environmental contaminants (up to) |  | $ 2,980,000
Superfund Sites | Manufactured Gas Plant Sites | Maximum | CECONY |  |
Site Contingency [Line Items] |  |
Estimated aggregate undiscounted potential liability related environmental contaminants (up to) |  | $ 2,840,000

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