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Environmental Matters - Accrued Liabilities and Regulatory Assets (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Site Contingency [Line Items] |  |
Accrued liabilities | $ 1,112 | $ 1,118
Regulatory assets | 5,260 | 4,888
Manufactured gas plant sites |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 1,013 | 1,016
Other Superfund Sites |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 99 | 102
Superfund Sites |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 1,112 | 1,118
Regulatory assets |  | 1,105
CECONY |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 1,020 | 1,026
CECONY | Subsidiaries |  |
Site Contingency [Line Items] |  |
Regulatory assets | 4,948 | 4,568
CECONY | Manufactured gas plant sites | Subsidiaries |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 922 | 924
CECONY | Other Superfund Sites | Subsidiaries |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 98 | 102
CECONY | Superfund Sites | Subsidiaries |  |
Site Contingency [Line Items] |  |
Accrued liabilities | $ 1,020 | 1,026
Regulatory assets |  | $ 1,022

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