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Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current $ 65   $ 54
Regulatory assets - noncurrent 481   473
Regulatory Liability, Current 46   234
Regulatory liabilities-noncurrent 1,398   1,389
Purchased power and fuel 304 $ 202  
Removal Costs [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Liability, Current 0   0
Regulatory liabilities-noncurrent 1,145   1,136
Deferred Income Tax Charge [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Liability, Current 0   0
Regulatory liabilities-noncurrent 190   194
Asset Retirement Obligation Costs [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Liability, Current 0   0
Regulatory liabilities-noncurrent 9   7
Revenue Subject to Refund [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory liabilities-noncurrent 0   0
Other Regulatory Assets (Liabilities) [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Liability, Current 34   39
Regulatory liabilities-noncurrent 54   52
Regulatory Clause Revenues, under-recovered      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Liability, Current 12   195
Deferred Derivative Gain (Loss) [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 0   0
Regulatory assets - noncurrent 22   1
Pension and Other Postretirement Plans Costs [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 0   0
Regulatory assets - noncurrent 95   95
Loss on Reacquired Debt [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 0   0
Regulatory assets - noncurrent 21   21
Environmental Restoration Costs [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 0   0
Regulatory assets - noncurrent 133   133
Other Regulatory Assets (Liabilities) [Member]      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 20   26
Regulatory assets - noncurrent 72   68
Storm Costs      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 12   10
Regulatory assets - noncurrent 61   64
Fire      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 5   4
Regulatory assets - noncurrent 26   27
pandemic      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 12   0
Regulatory assets - noncurrent 10   22
wildfire      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 0   0
Regulatory assets - noncurrent 31   28
Deferred Fuel Costs      
Regulatory Assets and Liabilities [Line Items]      
Regulatory Assets, Current 16   14
Regulatory assets - noncurrent $ 10   $ 14