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Environmental Matters - Accrued Liabilities and Regulatory Assets (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Site Contingency [Line Items] |  |
Accrued liabilities | $ 923 | $ 940
Regulatory assets | 3,987 | 3,845
Subsidiaries |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 833 | 850
Manufactured gas plant sites |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 833 | 845
Other Superfund Sites |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 90 | 95
Superfund Sites |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 923 | 940
Regulatory assets | 919 | 938
CECONY | Subsidiaries |  |
Site Contingency [Line Items] |  |
Regulatory assets | 3,667 | 3,504
CECONY | Manufactured gas plant sites | Subsidiaries |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 744 | 755
CECONY | Other Superfund Sites | Subsidiaries |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 89 | 95
CECONY | Superfund Sites | Subsidiaries |  |
Site Contingency [Line Items] |  |
Accrued liabilities | 833 | 850
Regulatory assets | $ 840 | $ 860

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