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Income Tax - Income Tax Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
STATUTORY TAX RATE        
Federal $ 187 $ 152 $ 466 $ 382
Federal 21.00% 21.00% 21.00% 21.00%
Changes in computed taxes resulting from:        
State income taxes, net of federal income taxes $ 47 $ 39 $ 116 $ 91
MTA Surcredit amortization, net of federal taxes (5) 0 (26) (2)
Tax Credits (4) (7) (13) (20)
Changes in unrecognized tax benefits 1 1 2 2
Amortization of excess deferred federal income taxes (11) (50) (34) (152)
Allowance for uncollectible accounts, net of regulatory recovery (15) (10) (36) (14)
Cost of removal 10 10 29 30
Other (8) (2) (11) (10)
Effective tax rate $ 202 $ 133 $ 493 $ 307
Changes in computed taxes resulting from:        
State income taxes, net of federal income taxes 5.30% 5.50% 5.20% 5.00%
MTA Surcredit amortization, net of federal taxes (0.006) 0 (0.012) (0.001)
Tax Credits (0.50%) (1.00%) (0.60%) (1.10%)
Changes in unrecognized tax benefits 0.10% 0.10% 0.10% 0.10%
Amortization of excess deferred federal income taxes (1.30%) (6.90%) (1.50%) (8.30%)
Allowance for uncollectible accounts, net of regulatory recovery (1.60%) (1.40%) (1.60%) (0.80%)
Cost of removal 1.10% 1.40% 1.30% 1.70%
Other (0.80%) (0.20%) (0.50%) (0.60%)
Effective tax rate 22.70% 18.50% 22.20% 16.90%
CECONY        
Changes in computed taxes resulting from:        
Effective tax rate $ 187 $ 119 $ 462 $ 301
CECONY | Subsidiaries        
STATUTORY TAX RATE        
Federal $ 173 $ 138 $ 434 $ 361
Federal 21.00% 21.00% 21.00% 21.00%
Changes in computed taxes resulting from:        
State income taxes, net of federal income taxes $ 43 $ 34 $ 108 $ 89
MTA Surcredit amortization, net of federal taxes (5) 1 (25) (1)
Tax Credits (3) (4) (10) (10)
Changes in unrecognized tax benefits 1 1 2 2
Amortization of excess deferred federal income taxes (9) (48) (28) (147)
Allowance for uncollectible accounts, net of regulatory recovery (15) (9) (36) (13)
Cost of removal 9 9 26 27
Other (7) (3) (9) (7)
Effective tax rate $ 187 $ 119 $ 462 $ 301
Changes in computed taxes resulting from:        
State income taxes, net of federal income taxes 5.20% 5.20% 5.20% 5.20%
MTA Surcredit amortization, net of federal taxes (0.006) 0.002 (0.012) (0.001)
Tax Credits (0.40%) (0.60%) (0.50%) (0.60%)
Changes in unrecognized tax benefits 0.10% 0.10% 0.20% 0.10%
Amortization of excess deferred federal income taxes (1.10%) (7.40%) (1.30%) (8.50%)
Allowance for uncollectible accounts, net of regulatory recovery (1.80%) (1.40%) (1.80%) (0.80%)
Cost of removal 1.10% 1.40% 1.30% 1.60%
Other (0.80%) (0.30%) (0.50%) (0.40%)
Effective tax rate 22.70% 18.20% 22.40% 17.50%