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Environmental Matters - Accrued Liability for Asbestos Suits and Workers' Compensation Proceedings (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Site Contingency [Line Items] |  |
Regulatory assets | $ 5,664 | $ 4,888
Regulatory liabilities | 5,546 | 5,473
Asbestos Suits |  |
Site Contingency [Line Items] |  |
Accrued liability | 8 | 8
Regulatory assets | 8 | 8
Workers' Compensation |  |
Site Contingency [Line Items] |  |
Accrued liability | 53 | 56
Regulatory liabilities | $ 20 | $ 17
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Accrued Liabilities | Accrued Liabilities
CECONY | Asbestos Suits |  |
Site Contingency [Line Items] |  |
Accrued liability | $ 7 | $ 7
Regulatory assets | 7 | 7
CECONY | Workers' Compensation |  |
Site Contingency [Line Items] |  |
Accrued liability | 51 | 54
Regulatory liabilities | $ 20 | $ 17
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Accrued Liabilities | Accrued Liabilities

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