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Balance Sheet Components (Details)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]            
Unbilled Receivables, Current $ 151     $ 151   $ 177
Accounts Receivable, Allowance for Credit Loss 14   $ 14 14   12
Finite-Lived Intangible Assets, Accumulated Amortization 667     667   611
Amortization of Intangible Assets 19     57 $ 55  
Line of Credit Facility, Current Borrowing Capacity 750     750    
Line of Credit Facility, Maximum Borrowing Capacity $ 850     $ 850    
Debt Instrument, Covenant Description       65.00%    
Ratio of Indebtedness to Net Capital 0.545     0.545    
Line of Credit Facility, Remaining Borrowing Capacity $ 750     $ 750    
Authorized Short-Term Debt 900     900    
Purchased power and fuel 372 $ 380   1,034 1,060  
Repayments of Long-term Debt       102 0  
Amount above baseline net variable power costs       (3)    
Revenues 952 929   2,687 2,616  
Letters of Credit Outstanding, Amount 169     169    
Line of Credit, Current 320     320    
Revenues 952 $ 929   2,687 $ 2,616  
Regulatory assets - noncurrent 599     599   632
Regulatory liabilities-noncurrent 1,491     1,491   1,440
Regulatory assets - current 207     207   205
RCE deferred     $ 87 2    
Fire            
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]            
Regulatory assets - noncurrent 15     15   18
Regulatory assets - current 6     6   6
wildfire            
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]            
Regulatory assets - noncurrent 0     0   0
Regulatory assets - current 46     46   $ 43
Letter of Credit [Member]            
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]            
Commercial paper $ 0     $ 0