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Environmental Matters - Additional Information (Details) - Superfund Sites $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Site Contingency [Line Items]
Remediation cost estimate	$ 39
Manufactured Gas Plant Sites | Maximum
Site Contingency [Line Items]
Estimated aggregate undiscounted potential liability related environmental contaminants (up to)	3,237
CECONY
Site Contingency [Line Items]
Remediation cost estimate	38
CECONY | Manufactured Gas Plant Sites | Maximum
Site Contingency [Line Items]
Estimated aggregate undiscounted potential liability related environmental contaminants (up to)	$ 3,391

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