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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

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- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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