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Balance Sheet Components (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Accounts Receivable, Allowance for Credit Loss $ 13   $ 12
Unbilled Receivables, Current 135   177
Finite-Lived Intangible Assets, Accumulated Amortization 630   611
Amortization of Intangible Assets 19 $ 18  
Line of Credit Facility, Maximum Borrowing Capacity $ 850    
Debt Instrument, Covenant Description 65.00%    
Ratio of Indebtedness to Net Capital 0.552    
Line of Credit Facility, Remaining Borrowing Capacity $ 750    
Line of Credit Facility, Current Borrowing Capacity 750    
Authorized Short-Term Debt 900    
Purchased power and fuel 368 405  
Repayments of Long-term Debt 102 0  
Amount above baseline net variable power costs (6)    
Revenues 928 929  
Letters of Credit Outstanding, Amount 133    
Line of Credit, Current 320    
Revenues 928 $ 929  
Regulatory assets - noncurrent 633   632
Regulatory liabilities-noncurrent 1,412   1,440
Regulatory assets - current 164   205
RCE deferred 3   92
Fire      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Regulatory assets - noncurrent 18   18
Regulatory assets - current 5   6
wildfire      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Regulatory assets - noncurrent 0   0
Regulatory assets - current 44   $ 43
Letter of Credit [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Commercial paper $ 0