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Environmental Matters - Accrued Liability (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Site Contingency [Line Items] |  |
Regulatory assets | $ 3,880 | $ 3,845
Asbestos Suits |  |
Site Contingency [Line Items] |  |
Accrued liability | 8 | 8
Regulatory assets | 8 | 8
Workers’ Compensation |  |
Site Contingency [Line Items] |  |
Accrued liability | 63 | 65
Regulatory assets | 10 | 8
CECONY | Subsidiaries |  |
Site Contingency [Line Items] |  |
Regulatory assets | 3,541 | 3,504
CECONY | Asbestos Suits | Subsidiaries |  |
Site Contingency [Line Items] |  |
Accrued liability | 7 | 7
Regulatory assets | 7 | 7
CECONY | Workers’ Compensation | Subsidiaries |  |
Site Contingency [Line Items] |  |
Accrued liability | 60 | 62
Regulatory assets | $ 10 | $ 8

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