Regulatory Matters - Other Regulatory Matters (Details) - USD ($) $ in Millions	Nov. 06, 2025	Dec. 31, 2025	Dec. 31, 2024
CECONY
Public Utilities, General Disclosures [Line Items]
Public utilities, annual gas revenue requirement amount	$ 33.3
Public utilities, rate adjustment mechanism	$ 100.0
Net regulatory assets		$ 1,049.0	$ 1,078.0
O&R
Public Utilities, General Disclosures [Line Items]
Net regulatory assets		$ 10.0	$ 14.0