v3.26.1
Financial Information by Business Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting [Abstract]          
Reportable segments     segments    
Segment Reporting [Line Items]          
Total revenues $ 4,069 $ 3,595 $ 9,164 $ 8,393  
Other operations and maintenance 913 923 1,851 1,875  
Depreciation and amortization 578 576 1,150 1,140  
Other operating expense 2,026 1,741 4,433 3,898  
Operating Income (Loss) 552 355 1,730 1,480  
Other Income (deductions) 170 241 338 462  
Interest Expense 333 318 659 648  
Allowance for borrowed funds used during construction (19) (18) (37) (36)  
Income Tax Expense 100 50 403 292  
Total assets 76,459 71,501 76,459 71,501 $ 74,603
Capital expenditures 1,499 1,265 2,655 2,356  
CECONY          
Segment Reporting [Line Items]          
Total revenues 3,805 3,340 8,459 7,782  
Depreciation and amortization 544 544 1,082 1,077  
Operating Income (Loss) 539 347 1,646 1,414  
Other Income (deductions) 149 209 292 407  
Allowance for borrowed funds used during construction (17) (16) (33) (33)  
Total assets 71,287   71,287   $ 69,316
Operating segment | Con Edison Transmission          
Segment Reporting [Line Items]          
Total revenues 1 1 2 2  
Other operations and maintenance 2 4 5 7  
Depreciation and amortization 0 0 0 0  
Other operating expense 0 0 0 0  
Operating Income (Loss) (1) (3) (3) (5)  
Other Income (deductions) 11 17 26 33  
Interest Expense 0 0 0 0  
Income Tax Expense 3 4 62 8  
Total assets 381 490 381 490  
Capital expenditures 15 15 31 29  
Operating segment | CECONY          
Segment Reporting [Line Items]          
Total revenues 3,805 3,340 8,459 7,782  
Other operations and maintenance 814 826 1,658 1,680  
Depreciation and amortization 544 544 1,082 1,077  
Other operating expense 1,908 1,623 4,073 3,611  
Operating Income (Loss) 539 347 1,646 1,414  
Other Income (deductions) 149 209 292 407  
Interest Expense 311 302 613 612  
Allowance for borrowed funds used during construction (17) (16) (33) (33)  
Income Tax Expense 98 48 329 275  
Total assets 71,287 66,565 71,287 66,565  
Capital expenditures 1,347 1,154 2,413 2,146  
Operating segment | CECONY | Electric          
Segment Reporting [Line Items]          
Total revenues 2,934 2,581 5,692 5,267  
Other operations and maintenance 610 636 1,259 1,295  
Depreciation and amortization 392 396 779 784  
Other operating expense 1,507 1,237 2,894 2,586  
Operating Income (Loss) 425 312 760 602  
Other Income (deductions) 108 159 213 313  
Interest Expense 218 212 427 431  
Allowance for borrowed funds used during construction (13) (11) (25) (23)  
Income Tax Expense 87 51 147 88  
Total assets 50,354 46,885 50,354 46,885  
Capital expenditures 1,019 814 1,842 1,505  
Operating segment | CECONY | Gas          
Segment Reporting [Line Items]          
Total revenues 753 653 2,217 2,055  
Other operations and maintenance 142 134 279 273  
Depreciation and amortization 122 119 244 237  
Other operating expense 317 314 901 819  
Operating Income (Loss) 172 86 793 726  
Other Income (deductions) 35 37 67 69  
Interest Expense 78 75 156 152  
Allowance for borrowed funds used during construction (4) (5) (8) (9)  
Income Tax Expense 30 11 169 169  
Total assets 18,452 16,749 18,452 16,749  
Capital expenditures 302 314 521 586  
Operating segment | CECONY | Steam          
Segment Reporting [Line Items]          
Total revenues 118 106 550 460  
Other operations and maintenance 62 56 120 112  
Depreciation and amortization 30 29 59 56  
Other operating expense 84 72 278 206  
Operating Income (Loss) (58) (51) 93 86  
Other Income (deductions) 6 13 12 25  
Interest Expense 15 15 30 29  
Allowance for borrowed funds used during construction 0 0 0 (1)  
Income Tax Expense (19) (14) 13 18  
Total assets 2,481 2,931 2,481 2,931  
Capital expenditures 26 26 50 55  
Operating segment | O&R          
Segment Reporting [Line Items]          
Total revenues 263 254 704 610  
Other operations and maintenance 96 93 189 188  
Depreciation and amortization 34 31 67 62  
Other operating expense 117 117 356 285  
Operating Income (Loss) 16 13 92 75  
Other Income (deductions) 10 11 19 23  
Interest Expense 20 17 40 34  
Allowance for borrowed funds used during construction (2) (2) (4) (3)  
Income Tax Expense 0 1 16 14  
Total assets 4,597 4,124 4,597 4,124  
Capital expenditures 137 96 211 181  
Operating segment | O&R | Electric          
Segment Reporting [Line Items]          
Total revenues 205 196 487 411  
Other operations and maintenance 75 73 146 148  
Depreciation and amortization 23 22 45 43  
Other operating expense 87 85 251 187  
Operating Income (Loss) 20 16 45 33  
Other Income (deductions) 8 8 15 17  
Interest Expense 13 11 26 22  
Allowance for borrowed funds used during construction (2) (2) (3) (3)  
Income Tax Expense 3 3 8 6  
Total assets 3,056 2,719 3,056 2,719  
Capital expenditures 95 64 148 122  
Operating segment | O&R | Gas          
Segment Reporting [Line Items]          
Total revenues 58 58 217 199  
Other operations and maintenance 21 20 43 40  
Depreciation and amortization 11 9 22 19  
Other operating expense 30 32 105 98  
Operating Income (Loss) (4) (3) 47 42  
Other Income (deductions) 2 3 4 6  
Interest Expense 7 6 14 12  
Allowance for borrowed funds used during construction 0 0 (1) 0  
Income Tax Expense (3) (2) 8 8  
Total assets 1,541 1,405 1,541 1,405  
Capital expenditures 42 32 63 59  
Other          
Segment Reporting [Line Items]          
Total revenues 0 0 (1) (1)  
Other operations and maintenance 1 0 (1) 0  
Depreciation and amortization 0 1 1 1  
Other operating expense 1 1 4 2  
Operating Income (Loss) (2) (2) (5) (4)  
Other Income (deductions) 0 4 1 (1)  
Interest Expense 2 (1) 6 2  
Allowance for borrowed funds used during construction 0 0 0 0  
Income Tax Expense (1) (3) (4) (5)  
Total assets 194 322 194 322  
Capital expenditures 0 0 0 0  
Inter-segment          
Segment Reporting [Line Items]          
Total revenues 0 0 0 0  
Inter-segment | CECONY          
Segment Reporting [Line Items]          
Total revenues (28) (26) (55) (53)  
Inter-segment | CECONY | Electric          
Segment Reporting [Line Items]          
Total revenues 5 5 10 10  
Inter-segment | CECONY | Gas          
Segment Reporting [Line Items]          
Total revenues 2 2 5 5  
Inter-segment | CECONY | Steam          
Segment Reporting [Line Items]          
Total revenues $ 21 $ 19 $ 40 $ 38