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Environmental Matters - Environmental Remediation Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Environmental Exit Cost [Line Items]    
Remediation costs incurred $ 44 $ 13
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 $ 44 $ 12
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Expense Other Nonoperating Expense