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Environmental Matters - Accrued Liability for Asbestos Suits and Workers' Compensation Proceedings (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Site Contingency [Line Items] |  |
Regulatory assets | $ 4,279 | $ 3,845
Regulatory liabilities | 6,401 | 4,566
Asbestos Suits |  |
Site Contingency [Line Items] |  |
Accrued liability | 8 | 8
Regulatory assets | 8 | 8
Workers' Compensation |  |
Site Contingency [Line Items] |  |
Accrued liability | 61 | 65
Regulatory liabilities | $ 11 | $ 8
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Accrued Liabilities | Accrued Liabilities
CECONY | Asbestos Suits |  |
Site Contingency [Line Items] |  |
Accrued liability | $ 7 | $ 7
Regulatory assets | 7 | 7
CECONY | Workers' Compensation |  |
Site Contingency [Line Items] |  |
Accrued liability | 59 | 62
Regulatory liabilities | $ 11 | $ 8
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Accrued Liabilities | Accrued Liabilities

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