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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]      
Regulatory Liabilities $ 1,493 $ 1,446  
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided 506    
Other Investments $ 12 0  
Document Period End Date Dec. 31, 2024    
Letters of Credit Outstanding, Amount $ 85 $ 40  
Public Utilities, Allowance for Funds Used During Construction, Rate 6.70% 6.50% 6.50%
Public Utilities, Allowance for Funds Used During Construction, Capitalized Interest $ 15 $ 13 $ 7
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity $ 23 $ 19 $ 14
Depreciation expense rate 3.50% 340.00% 340.00%
Amortization of Intangible Assets $ 72 $ 61 $ 58
Public Utilities, Approved Return on Equity, Percentage 9.50% 9.50%  
Regulatory Assets $ 837 $ 713  
Finite-Lived Intangible Assets, Accumulated Amortization 611 558  
Future Amortization Expense, Year One 70    
Future Amortization Expense, Year Two 62    
Future Amortization Expense, Year Three 56    
Future Amortization Expense, Year Four 33    
Future Amortization Expense, Year Five 13    
Power Cost Deadband - Lower Threshold 15    
Power Cost Deadband - Upper Threshold 30    
Quantifying Misstatement in Current Year Financial Statements, Amount 5,714 5,249  
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation 5,085 4,757  
Other Operating Activities, Cash Flow Statement 112 24 0
Asset Retirement Obligation, Cash Paid to Settle 16 25 27
Deferred Purchased Power Costs 78 5  
Unbilled Receivables, Current 177 138  
Excise Taxes Collected 63 56 53
Other Operating Activities, Cash Flow Statement 112 24 $ 0
LettersOfCreditOutstandingAmountForPriceRiskManagement 18    
Trojan decommissioning [Member]      
Property, Plant and Equipment [Line Items]      
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided 161 139  
Asset Retirement Obligation Costs [Member]      
Property, Plant and Equipment [Line Items]      
Regulatory Liabilities 7 4  
Deferred Income Tax Charge [Member]      
Property, Plant and Equipment [Line Items]      
Regulatory Liabilities 179 $ 177  
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided $ 0