v3.26.1
Regulatory Matters - Regulatory Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent $ 5,124 $ 5,374
Regulatory liabilities – current 534 249
Total Regulatory Liabilities 5,658 5,623
Allowance for cost of removal less salvage    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 1,747 1,686
Future income tax    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 1,093 1,120
Unrecognized other postretirement benefit cost    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 781 873
Pension and other postretirement benefit deferrals    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 252 356
Net unbilled revenue deferrals    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 232 397
Late payment charge deferral    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 100 192
Deferred derivative gains - long term    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 142 119
System benefit charge carrying charge    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 103 108
Storm reserve passback    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 64 80
Settlement of prudence proceeding    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 7 8
Other    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 603 435
Deferred derivative gains    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – current 296 165
Revenue decoupling mechanism liabilities    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – current 189 13
Refundable energy costs current    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – current 49 71
CECONY    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 4,607 4,879
Regulatory liabilities – current 443 205
CECONY | Subsidiaries    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 4,607 4,879
Regulatory liabilities – current 443 205
Total Regulatory Liabilities 5,050 5,084
CECONY | Allowance for cost of removal less salvage | Subsidiaries    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 1,523 1,468
CECONY | Future income tax | Subsidiaries    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 982 1,015
CECONY | Unrecognized other postretirement benefit cost | Subsidiaries    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 716 806
CECONY | Pension and other postretirement benefit deferrals | Subsidiaries    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 201 313
CECONY | Net unbilled revenue deferrals | Subsidiaries    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 232 397
CECONY | Late payment charge deferral | Subsidiaries    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 100 191
CECONY | Deferred derivative gains - long term | Subsidiaries    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 132 109
CECONY | System benefit charge carrying charge | Subsidiaries    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 95 100
CECONY | Storm reserve passback | Subsidiaries    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 64 80
CECONY | Settlement of prudence proceeding | Subsidiaries    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 7 8
CECONY | Other | Subsidiaries    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – noncurrent 555 392
CECONY | Deferred derivative gains | Subsidiaries    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – current 275 152
CECONY | Revenue decoupling mechanism liabilities | Subsidiaries    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – current 163 0
CECONY | Refundable energy costs current | Subsidiaries    
Regulatory Liabilities [Line Items]    
Regulatory liabilities – current $ 5 $ 53