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Selected Balance Sheet Data Selected Balance Sheet Data, Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Public Utilities, Inventory [Line Items]    
Total inventories $ 668 $ 666
Materials and supplies    
Public Utilities, Inventory [Line Items]    
Inventories 441 406
Fuel    
Public Utilities, Inventory [Line Items]    
Inventories 171 164
Natural gas    
Public Utilities, Inventory [Line Items]    
Inventories $ 56 $ 96