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Environmental Matters - Accrued Liability (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Site Contingency [Line Items] |  |
Regulatory assets | $ 4,514 | $ 4,279
Asbestos Suits |  |
Site Contingency [Line Items] |  |
Accrued liability | 8 | 8
Regulatory assets | 8 | 8
Workers’ Compensation |  |
Site Contingency [Line Items] |  |
Accrued liability | 57 | 61
Regulatory assets | 12 | 11
CECONY | Subsidiaries |  |
Site Contingency [Line Items] |  |
Regulatory assets | 4,220 | 3,955
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 | 59
Regulatory assets | $ 15 | $ 11

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