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Selected Balance Sheet Data Selected Balance Sheet Data, Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Public Utilities, Inventory [Line Items]    
Total inventories $ 622 $ 711
Materials and supplies    
Public Utilities, Inventory [Line Items]    
Inventories 394 377
Fuel    
Public Utilities, Inventory [Line Items]    
Inventories 181 211
Natural gas    
Public Utilities, Inventory [Line Items]    
Inventories $ 47 $ 123