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Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current $ 164   $ 205
Regulatory assets - noncurrent 633   632
Regulatory Liability, Current 81   53
Regulatory liabilities-noncurrent 1,412   1,440
Purchased power and fuel 368 $ 405  
Removal Costs [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Liability, Current 0   0
Regulatory liabilities-noncurrent 1,210   1,199
Deferred Income Tax Charge [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Liability, Current 0   0
Regulatory liabilities-noncurrent 174   179
Other Regulatory Assets (Liabilities) [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Liability, Current 40   53
Regulatory liabilities-noncurrent 24   22
us-gaap_revenuerefund      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Liability, Current 41   0
Regulatory liabilities-noncurrent 4   40
Deferred Derivative Gain (Loss) [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 83   115
Regulatory assets - noncurrent 60   70
Pension and Other Postretirement Plans Costs [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 0   0
Regulatory assets - noncurrent 84   84
Environmental Restoration Costs [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 0   0
Regulatory assets - noncurrent 162   161
Other Regulatory Assets (Liabilities) [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 19   27
Regulatory assets - noncurrent 125   119
Storm Costs      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 13   14
Regulatory assets - noncurrent 43   44
Fire      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 5   6
Regulatory assets - noncurrent 18   18
wildfire      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 44   43
Regulatory assets - noncurrent 0   0
StormCosts - RCE      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 0   0
Regulatory assets - noncurrent 95   90
StormCosts - Jan 2024      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 0   0
Regulatory assets - noncurrent $ 46   $ 46