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Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current $ 207   $ 207   $ 205
Regulatory assets - noncurrent 599   599   632
Regulatory Liability, Current 61   61   53
Regulatory liabilities-noncurrent 1,491   1,491   1,440
Purchased power and fuel 372 $ 380 1,034 $ 1,060  
Removal Costs [Member]          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Liability, Current 0   0   0
Regulatory liabilities-noncurrent 1,233   1,233   1,199
Deferred Income Tax Charge [Member]          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Liability, Current 0   0   0
Regulatory liabilities-noncurrent 231   231   179
Other Regulatory Assets (Liabilities) [Member]          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Liability, Current 36   36   53
Regulatory liabilities-noncurrent 21   21   22
us-gaap_revenuerefund          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Liability, Current 25   25   0
Regulatory liabilities-noncurrent 6   6   40
Deferred Derivative Gain (Loss) [Member]          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 117   117   115
Regulatory assets - noncurrent 39   39   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 165   165   161
Other Regulatory Assets (Liabilities) [Member]          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 24   24   27
Regulatory assets - noncurrent 125   125   119
Storm Costs          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 14   14   14
Regulatory assets - noncurrent 35   35   44
Fire          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 6   6   6
Regulatory assets - noncurrent 15   15   18
wildfire          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 46   46   43
Regulatory assets - noncurrent 0   0   0
StormCosts - RCE          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 0   0   0
Regulatory assets - noncurrent 89   89   90
StormCosts - Jan 2024          
Regulatory Assets and Liabilities [Line Items]          
Regulatory Assets, Current 0   0   0
Regulatory assets - noncurrent $ 47   $ 47   $ 46