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Environmental Matters - Accrued Liability (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Site Contingency [Line Items] |  |
Regulatory assets | $ 5,260 | $ 4,888
Asbestos Suits |  |
Site Contingency [Line Items] |  |
Accrued liability | 8 | 8
Regulatory assets | 8 | 8
Workers’ Compensation |  |
Site Contingency [Line Items] |  |
Accrued liability | 57 | 56
Regulatory assets | 15 | 17
CECONY | Subsidiaries |  |
Site Contingency [Line Items] |  |
Regulatory assets | 4,948 | 4,568
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 | 55 | 54
Regulatory assets | $ 15 | $ 17

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