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Environmental Matters - Environmental Remediation Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Environmental Exit Cost [Line Items] |  |  |  |
Remediation costs incurred | $ 9 | $ 3 | $ 15 | $ 7
CECONY | Subsidiaries |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |
Remediation costs incurred | $ 9 | $ 3 | $ 15 | $ 6

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