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Environmental Matters - Accrued Liabilities and Regulatory Assets (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Site Contingency [Line Items] |  |
Accrued Liabilities | $ 1,037 | $ 1,118
Regulatory assets | 5,664 | 4,888
Manufactured gas plant sites |  |
Site Contingency [Line Items] |  |
Accrued Liabilities | 941 | 1,016
Other Superfund Sites |  |
Site Contingency [Line Items] |  |
Accrued Liabilities | 96 | 102
Superfund Sites |  |
Site Contingency [Line Items] |  |
Accrued Liabilities | 1,037 | 1,118
Regulatory assets | 1,038 | 1,105
CECONY |  |
Site Contingency [Line Items] |  |
Accrued Liabilities | 942 | 1,026
CECONY | Manufactured gas plant sites |  |
Site Contingency [Line Items] |  |
Accrued Liabilities | 846 | 924
CECONY | Other Superfund Sites |  |
Site Contingency [Line Items] |  |
Accrued Liabilities | 96 | 102
CECONY | Superfund Sites |  |
Site Contingency [Line Items] |  |
Accrued Liabilities | 942 | 1,026
Regulatory assets | $ 952 | $ 1,022

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