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Environmental Matters - Environmental Remediation Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Environmental Exit Cost [Line Items] |  |  |  |
Remediation costs incurred | $ 3 | $ 7 | $ 17 | $ 21
CECONY | Subsidiaries |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |
Remediation costs incurred | $ 3 | $ 7 | $ 16 | $ 20

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