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Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current $ 188   $ 188   $ 205
Regulatory assets - noncurrent 581   581   632
Regulatory Liability, Current 72   72   53
Regulatory liabilities-noncurrent 1,420   1,420   1,440
Purchased power and fuel 294 $ 275 662 $ 680  
Removal Costs [Member]          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Liability, Current 0   0   0
Regulatory liabilities-noncurrent 1,221   1,221   1,199
Deferred Income Tax Charge [Member]          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Liability, Current 0   0   0
Regulatory liabilities-noncurrent 173   173   179
Other Regulatory Assets (Liabilities) [Member]          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Liability, Current 41   41   53
Regulatory liabilities-noncurrent 21   21   22
us-gaap_revenuerefund          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Liability, Current 31   31   0
Regulatory liabilities-noncurrent 5   5   40
Deferred Derivative Gain (Loss) [Member]          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 100   100   115
Regulatory assets - noncurrent 22   22   70
Pension and Other Postretirement Plans Costs [Member]          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 0   0   0
Regulatory assets - noncurrent 84   84   84
Environmental Restoration Costs [Member]          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 0   0   0
Regulatory assets - noncurrent 164   164   161
Other Regulatory Assets (Liabilities) [Member]          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 26   26   27
Regulatory assets - noncurrent 114   114   119
Storm Costs          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 13   13   14
Regulatory assets - noncurrent 39   39   44
Fire          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 5   5   6
Regulatory assets - noncurrent 16   16   18
wildfire          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 44   44   43
Regulatory assets - noncurrent 0   0   0
StormCosts - RCE          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 0   0   0
Regulatory assets - noncurrent 95   95   90
StormCosts - Jan 2024          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 0   0   0
Regulatory assets - noncurrent $ 47   $ 47   $ 46