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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Abstract]      
Depreciation expense expressed as a percentage of average depreciable property 3.60% 3.70% 3.50%
Nuclear Decommissioning [Abstract]      
Studies time periods 3 years    
Cash and Cash Equivalents [Abstract]      
maturity period 3 months    
Accounts, Notes, Loans and Financing Receivable      
Allowance for bad debts $ 128 $ 122  
Alternative Revenue Programs [Abstract]      
maximum number of months following end of annual period in which revenues are earned to be included in 24 months    
Inventories $ 711 803  
Studies time periods 3 years    
maximum number of months following end of annual period in which revenues are earned to be included in 24 months    
maturity period 3 months    
Supplies [Member]      
Inventories $ 377 330  
Public Utilities, Inventory, Fuel [Member]      
Inventories 211 201  
Public Utilities, Inventory, Natural Gas [Member]      
Inventories $ 123 $ 272