v3.26.1
Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 7,541 $ 6,106
Other revenue sources(e) 3,581 682
Operating revenues 11,122 6,788
Power and Power-related Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 6,037 5,226
Other revenue sources(e) 0 0
Operating revenues 6,037 5,226
Capacity Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 416 12
Other revenue sources(e) 0 0
Operating revenues 416 12
Other Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 1,088 868
Other revenue sources(e) 3,581 682
Operating revenues 4,669 1,550
Total Power revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 6,453 5,238
Total Power revenues | Power and Power-related Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 6,037 5,226
Total Power revenues | Capacity Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 416 12
Total Power revenues | Other Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Total Power revenues | PJM    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 3,460 2,706
Total Power revenues | PJM | Power and Power-related Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 3,330 2,698
Total Power revenues | PJM | Capacity Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 130 8
Total Power revenues | PJM | Other Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Total Power revenues | MISO    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 258 214
Total Power revenues | MISO | Power and Power-related Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 252 214
Total Power revenues | MISO | Capacity Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 6 0
Total Power revenues | MISO | Other Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Total Power revenues | ERCOT    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 459 301
Total Power revenues | ERCOT | Power and Power-related Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 360 301
Total Power revenues | ERCOT | Capacity Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 99 0
Total Power revenues | ERCOT | Other Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Total Power revenues | NYISO    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 758 675
Total Power revenues | NYISO | Power and Power-related Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 745 675
Total Power revenues | NYISO | Capacity Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 13 0
Total Power revenues | NYISO | Other Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Total Power revenues | ISO-NE    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 1,018 1,109
Total Power revenues | ISO-NE | Power and Power-related Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 1,014 1,109
Total Power revenues | ISO-NE | Capacity Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 4 0
Total Power revenues | ISO-NE | Other Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Total Power revenues | West    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 328 147
Total Power revenues | West | Power and Power-related Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 168 146
Total Power revenues | West | Capacity Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 160 1
Total Power revenues | West | Other Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Total Power revenues | SERC/SPP    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 63 38
Total Power revenues | SERC/SPP | Power and Power-related Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 59 35
Total Power revenues | SERC/SPP | Capacity Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 4 3
Total Power revenues | SERC/SPP | Other Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Total Power revenues | International Power    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 109 48
Total Power revenues | International Power | Power and Power-related Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 109 48
Total Power revenues | International Power | Capacity Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Total Power revenues | International Power | Other Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Gas revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 943 782
Gas revenues | Power and Power-related Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Gas revenues | Capacity Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Gas revenues | Other Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 943 782
Other revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 145 86
Other revenues | Power and Power-related Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Other revenues | Capacity Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Other revenues | Other Revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 145 $ 86