v3.25.2
Financial and Other Derivative Instruments (Effect of Derivatives Not Designated as Hedging Instruments) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Total $ 69 $ 122 $ 117 $ 102
Natural gas | Operating Revenues — Non-utility operations        
Derivative Instruments, Gain (Loss) [Line Items]        
Total (10) 45 84 (24)
Natural gas | Fuel, purchased power, gas, and other — non-utility        
Derivative Instruments, Gain (Loss) [Line Items]        
Total (46) (21) (146) 38
Electricity | Operating Revenues — Non-utility operations        
Derivative Instruments, Gain (Loss) [Line Items]        
Total 111 95 156 90
Environmental & Other | Operating Revenues — Non-utility operations        
Derivative Instruments, Gain (Loss) [Line Items]        
Total 14 3 23 (4)
Foreign currency exchange contracts | Operating Revenues — Non-utility operations        
Derivative Instruments, Gain (Loss) [Line Items]        
Total $ 0 $ 0 $ 0 $ 2