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Environmental Matters - Environmental Remediation Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Environmental Exit Cost [Line Items] |  |  |  |
Investigation and remediation costs incurred | $ 0 | $ 12 | $ 12 | $ 27
CECONY | Subsidiaries |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |
Investigation and remediation costs incurred | $ 0 | $ 12 | $ 11 | $ 27

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