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Environmental Matters - Accrued Liability (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Site Contingency [Line Items] |  |
Regulatory assets | $ 5,672 | $ 5,664
Regulatory liabilities | 5,069 | 5,546
Asbestos Suits |  |
Site Contingency [Line Items] |  |
Accrued liability | 8 | 8
Regulatory assets | 8 | 8
Workers’ Compensation |  |
Site Contingency [Line Items] |  |
Accrued liability | 52 | 53
Regulatory liabilities | 21 | 20
CECONY | Subsidiaries |  |
Site Contingency [Line Items] |  |
Regulatory assets | 5,307 | 5,264
Regulatory liabilities | 4,539 | 4,980
CECONY | Asbestos Suits | Subsidiaries |  |
Site Contingency [Line Items] |  |
Accrued liability | 7 | 7
Regulatory assets | 7 | 7
CECONY | Workers’ Compensation | Subsidiaries |  |
Site Contingency [Line Items] |  |
Accrued liability | 49 | 51
Regulatory liabilities | $ 21 | $ 20

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