v3.26.1
Current Expected Credit Losses - Schedule of Rollforward of Segment Type (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accounts receivable - customers        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance $ 468 $ 616 $ 507 $ 620
Recoveries 18 18 38 23
Write-offs (84) (120) (195) (218)
Reserve adjustments 56 101 108 190
Ending Balance 458 615 458 615
Other receivables        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 10 28 35 41
Recoveries 0 0 0 0
Write-offs 0 0 0 (4)
Reserve adjustments 0 14 (25) 5
Ending Balance 10 42 10 42
CECONY | Accounts receivable - customers | Subsidiaries        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 460 605 500 605
Recoveries 18 18 37 22
Write-offs (82) (118) (192) (213)
Reserve adjustments 54 100 105 191
Ending Balance 450 605 450 605
CECONY | Other receivables | Subsidiaries        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 8 25 27 38
Recoveries 0 0 0 0
Write-offs 0 0 0 (4)
Reserve adjustments 0 10 (19) 1
Ending Balance $ 8 $ 35 $ 8 $ 35