v3.26.1
Revenue Recognition (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 4,167 $ 3,629 $ 9,399 $ 8,517
Total revenues 4,069 3,595 9,164 8,393
Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues (98) (34) (235) (124)
CECONY        
Disaggregation of Revenue [Line Items]        
Total revenues 3,805 3,340 8,459 7,782
Operating Segments | Con Edison Transmission        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 1 1 2 2
Total revenues 1 1 2 2
Operating Segments | Con Edison Transmission | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | CECONY        
Disaggregation of Revenue [Line Items]        
Total revenues 3,805 3,340 8,459 7,782
Operating Segments | CECONY | Subsidiaries        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 3,904 3,368 8,662 7,891
Total revenues 3,805 3,340 8,459 7,782
Operating Segments | CECONY | Other revenues | Subsidiaries        
Disaggregation of Revenue [Line Items]        
Total revenues (99) (28) (203) (109)
Operating Segments | CECONY | Electric        
Disaggregation of Revenue [Line Items]        
Total revenues 2,934 2,581 5,692 5,267
Operating Segments | CECONY | Electric | Subsidiaries        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 3,053 2,565 5,923 5,333
Total revenues 2,934 2,581 5,692 5,267
Operating Segments | CECONY | Electric | Other revenues | Subsidiaries        
Disaggregation of Revenue [Line Items]        
Total revenues (119) 16 (231) (66)
Operating Segments | CECONY | Gas        
Disaggregation of Revenue [Line Items]        
Total revenues 753 653 2,217 2,055
Operating Segments | CECONY | Gas | Subsidiaries        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 731 696 2,184 2,095
Total revenues 753 653 2,217 2,055
Operating Segments | CECONY | Gas | Other revenues | Subsidiaries        
Disaggregation of Revenue [Line Items]        
Total revenues 22 (43) 33 (40)
Operating Segments | CECONY | Steam        
Disaggregation of Revenue [Line Items]        
Total revenues 118 106 550 460
Operating Segments | CECONY | Steam | Subsidiaries        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 120 107 555 463
Total revenues 118 106 550 460
Operating Segments | CECONY | Steam | Other revenues | Subsidiaries        
Disaggregation of Revenue [Line Items]        
Total revenues (2) (1) (5) (3)
Operating Segments | O&R        
Disaggregation of Revenue [Line Items]        
Total revenues 263 254 704 610
Operating Segments | O&R | Subsidiaries        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 262 260 735 624
Total revenues 263 254 704 610
Operating Segments | O&R | Other revenues | Subsidiaries        
Disaggregation of Revenue [Line Items]        
Total revenues 1 (6) (31) (14)
Operating Segments | O&R | Electric        
Disaggregation of Revenue [Line Items]        
Total revenues 205 196 487 411
Operating Segments | O&R | Electric | Subsidiaries        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 204 196 493 414
Total revenues 205 196 487 411
Operating Segments | O&R | Electric | Other revenues | Subsidiaries        
Disaggregation of Revenue [Line Items]        
Total revenues 1 0 (6) (3)
Operating Segments | O&R | Gas        
Disaggregation of Revenue [Line Items]        
Total revenues 58 58 217 199
Operating Segments | O&R | Gas | Subsidiaries        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 58 64 242 210
Total revenues 58 58 217 199
Operating Segments | O&R | Gas | Other revenues | Subsidiaries        
Disaggregation of Revenue [Line Items]        
Total revenues 0 (6) (25) (11)
Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Total revenues 0 0 (1) (1)
Other | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues $ 0 $ 0 $ (1) $ (1)