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Environmental Matters - Environmental Remediation Costs (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Environmental Exit Cost [Line Items] |  |
Remediation costs incurred | $ 7 | $ 3
CECONY | Subsidiaries |  |
Environmental Exit Cost [Line Items] |  |
Remediation costs incurred | $ 6 | $ 3

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