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Regulatory Matters - Other Regulatory Matters (Details) - USD ($)
$ in Millions
Dec. 31, 2024
May 31, 2024
Dec. 31, 2023
CECONY      
Public Utilities, General Disclosures [Line Items]      
Public utilities, requested capitalization of billing system costs $ 89.0    
Public utilities, billing system costs 510.0    
Net regulatory assets 1,078.0   $ 1,113.0
CECONY | Maximum      
Public Utilities, General Disclosures [Line Items]      
Public utilities, limit for capitalization 421.0 $ 421.0 38.0
O&R      
Public Utilities, General Disclosures [Line Items]      
Net regulatory assets $ 14.0   $ 18.0