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Environmental Matters - Environmental Remediation Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Environmental Exit Cost [Line Items] |  |
Remediation costs incurred | $ 13 | $ 21
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Expense | Other Nonoperating Expense
CECONY |  |
Environmental Exit Cost [Line Items] |  |
Remediation costs incurred | $ 12 | $ 20
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Expense | Other Nonoperating Expense

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