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Balance Sheet Components (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]            
Accounts Receivable, Allowance for Credit Loss $ 11   $ 11   $ 11 $ 9
Unbilled Receivables, Current 136   136     138
Finite-Lived Intangible Assets, Accumulated Amortization 594   594     558
Line of Credit Facility, Maximum Borrowing Capacity $ 850   $ 850      
Debt Instrument, Covenant Description     65.00%      
Ratio of Indebtedness to Net Capital 0.557   0.557      
Line of Credit Facility, Remaining Borrowing Capacity $ 750   $ 750      
Line of Credit Facility, Current Borrowing Capacity 750   750      
Authorized Short-Term Debt 900   900      
Purchased power and fuel 380 $ 386 1,060 $ 910    
Repayments of Long-term Debt     0 260    
Amount above baseline net variable power costs     (87)      
Revenues 929 802 2,616 2,198    
Letters of Credit Outstanding, Amount 82   82      
Line of Credit, Current 320   320      
Finance Lease, Liability, to be Paid 737   737      
Revenues 929 $ 802 2,616 $ 2,198    
Regulatory assets - noncurrent 619   619     492
Regulatory liabilities-noncurrent 1,413   1,413     1,398
Fire            
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]            
Regulatory assets - noncurrent 20   20     23
wildfire            
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]            
Regulatory assets - noncurrent 0   0     $ 10
Letter of Credit [Member]            
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]            
Commercial paper $ 0   $ 0