v3.26.1
Derivative Instruments and Hedging Activities - Schedule of Fair Values of Commodity Derivatives Including Offsetting (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Fair value of derivative assets    
Net Amounts of Assets (Liabilities) $ 1,109 $ 956
Fair value of derivative liabilities    
Gross Amounts of Recognized Assets (Liabilities) 392 231
Gross Amounts Offset (72) (58)
Net Amounts of Assets/ (Liabilities) 320 173
CECONY    
Fair value of derivative liabilities    
Gross Amounts of Recognized Assets (Liabilities) 367 214
Gross Amounts Offset (69) (56)
Net Amounts of Assets/ (Liabilities) 298 158
Current    
Fair value of derivative liabilities    
Gross Amounts of Recognized Assets (Liabilities) (62) (75)
Gross Amounts Offset 46 45
Net Amounts of Assets/ (Liabilities) (16) (30)
Current | CECONY    
Fair value of derivative liabilities    
Gross Amounts of Recognized Assets (Liabilities) (56) (70)
Gross Amounts Offset 44 43
Net Amounts of Assets/ (Liabilities) (12) (27)
Noncurrent    
Fair value of derivative liabilities    
Gross Amounts of Recognized Assets (Liabilities) (31) (18)
Gross Amounts Offset 28 10
Net Amounts of Assets/ (Liabilities) (3) (8)
Noncurrent | CECONY    
Fair value of derivative liabilities    
Gross Amounts of Recognized Assets (Liabilities) (30) (14)
Gross Amounts Offset 27 8
Net Amounts of Assets/ (Liabilities) (3) (6)
Total fair value of derivative liabilities    
Fair value of derivative liabilities    
Gross Amounts of Recognized Assets (Liabilities) (93) (93)
Gross Amounts Offset 74 55
Net Amounts of Assets/ (Liabilities) (19) (38)
Fair value of derivative liabilities    
Margin deposit liability (4) (16)
Total fair value of derivative liabilities | CECONY    
Fair value of derivative liabilities    
Gross Amounts of Recognized Assets (Liabilities) (86) (84)
Gross Amounts Offset 71 51
Net Amounts of Assets/ (Liabilities) (15) (33)
Fair value of derivative liabilities    
Margin deposit liability (2) (14)
Current    
Fair value of derivative assets    
Gross Amounts of Recognized Assets (Liabilities) 310 175
Gross Amounts Offset (116) (90)
Net Amounts of Assets (Liabilities) 194 85
Current | CECONY    
Fair value of derivative assets    
Gross Amounts of Recognized Assets (Liabilities) 289 162
Gross Amounts Offset (113) (88)
Net Amounts of Assets (Liabilities) 176 74
Noncurrent    
Fair value of derivative assets    
Gross Amounts of Recognized Assets (Liabilities) 175 149
Gross Amounts Offset (30) (23)
Net Amounts of Assets (Liabilities) 145 126
Noncurrent | CECONY    
Fair value of derivative assets    
Gross Amounts of Recognized Assets (Liabilities) 164 136
Gross Amounts Offset (27) (19)
Net Amounts of Assets (Liabilities) 137 117
Total fair value of derivative assets    
Fair value of derivative assets    
Gross Amounts of Recognized Assets (Liabilities) 485 324
Gross Amounts Offset (146) (113)
Net Amounts of Assets (Liabilities) 339 211
Fair value of derivative liabilities    
Margin Deposit Asset 3 1
Total fair value of derivative assets | CECONY    
Fair value of derivative assets    
Gross Amounts of Recognized Assets (Liabilities) 453 298
Gross Amounts Offset (140) (107)
Net Amounts of Assets (Liabilities) 313 191
Fair value of derivative liabilities    
Margin Deposit Asset $ 2 $ 0