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Balance Sheet Components (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]            
Accounts Receivable, Allowance for Credit Loss $ 13   $ 13   $ 13 $ 12
Unbilled Receivables, Current 117   117     131
Finite-Lived Intangible Assets, Accumulated Amortization 530   530     499
Amortization of Intangible Assets 15 $ 14 29 $ 29    
Line of Credit Facility, Maximum Borrowing Capacity $ 750   $ 750      
Debt Instrument, Covenant Description     65.00%      
Ratio of Indebtedness to Net Capital 0.540   0.540      
Line of Credit Facility, Remaining Borrowing Capacity $ 510   $ 510      
Line of Credit Facility, Current Borrowing Capacity 650   650      
Authorized Short-Term Debt 900   900      
Purchased power and fuel 220 168 524 370    
Repayments of Long-term Debt     260 0    
Amount above baseline net variable power costs     19      
Proceeds from failed sale-leaseback transactions     0 25    
Revenues 648 591 1,396 1,217    
Letters of Credit Outstanding, Amount 92   92      
Line of Credit, Current 220   220      
Finance Lease, Liability, to be Paid 737   737      
Revenues 648 $ 591 1,396 $ 1,217    
Regulatory assets - noncurrent 593   593     473
Regulatory liabilities-noncurrent 1,409   1,409     1,389
Fire            
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]            
Regulatory assets - noncurrent 25   25     27
pandemic            
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]            
Increase (Decrease) in Accounts Payable and Other Operating Liabilities 19   19      
Regulatory assets - noncurrent 7   7     22
wildfire            
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]            
Revenues     24      
Revenues     24      
Regulatory assets - noncurrent 32   32     $ 28
Letter of Credit [Member]            
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]            
Commercial paper $ 140   $ 140