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Environmental Matters - Accrued Liabilities and Regulatory Assets (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Site Contingency [Line Items] |  |
Accrued liabilities | $ 996 | $ 997
Regulatory assets | 4,514 | 4,279
Manufactured gas plant sites |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 874 | 876
Other Superfund Sites |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 122 | 121
Superfund Sites |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 996 | 997
Regulatory assets | 983 | 991
CECONY |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 902 | 903
CECONY | Subsidiaries |  |
Site Contingency [Line Items] |  |
Regulatory assets | 4,220 | 3,955
CECONY | Manufactured gas plant sites | Subsidiaries |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 780 | 782
CECONY | Other Superfund Sites | Subsidiaries |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 121 | 121
CECONY | Superfund Sites | Subsidiaries |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 901 | 903
Regulatory assets | $ 899 | $ 906

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