v3.26.1
Balance Sheet Components - Regulatory Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Regulatory Assets and Liabilities [Line Items]    
Regulatory Assets, Current $ 255 $ 168
Regulatory assets - noncurrent 521 619
Regulatory Liability, Current 69 74
Regulatory liabilities-noncurrent 1,507 1,490
Removal Costs [Member]    
Regulatory Assets and Liabilities [Line Items]    
Regulatory Liability, Current 0 0
Regulatory liabilities-noncurrent 1,266 1,245
Deferred Income Tax Charge [Member]    
Regulatory Assets and Liabilities [Line Items]    
Regulatory Liability, Current 0 0
Regulatory liabilities-noncurrent 222 228
Other Regulatory Liabilities [Member]    
Regulatory Assets and Liabilities [Line Items]    
Regulatory Liability, Current 60 53
Regulatory liabilities-noncurrent 19 16
us-gaap_revenuerefund    
Regulatory Assets and Liabilities [Line Items]    
Regulatory Liability, Current 9 21
Regulatory liabilities-noncurrent 0 1
Deferred Derivative Gain (Loss) [Member]    
Regulatory Assets and Liabilities [Line Items]    
Regulatory Assets, Current 100 127
Regulatory assets - noncurrent 60 54
Pension and Other Postretirement Plans Costs [Member]    
Regulatory Assets and Liabilities [Line Items]    
Regulatory Assets, Current 0 0
Regulatory assets - noncurrent 64 64
Environmental Restoration Costs [Member]    
Regulatory Assets and Liabilities [Line Items]    
Regulatory Assets, Current 0 0
Regulatory assets - noncurrent 165 161
Other Regulatory Assets [Member]    
Regulatory Assets and Liabilities [Line Items]    
Regulatory Assets, Current 24 14
Regulatory assets - noncurrent 102 98
Storm Costs    
Regulatory Assets and Liabilities [Line Items]    
Regulatory Assets, Current 13 13
Regulatory assets - noncurrent 28 33
Fire    
Regulatory Assets and Liabilities [Line Items]    
Regulatory Assets, Current 5 5
Regulatory assets - noncurrent 12 14
wildfire    
Regulatory Assets and Liabilities [Line Items]    
Regulatory Assets, Current 45 9
Regulatory assets - noncurrent 0 33
Portland Harbor Environmental Remediation Account    
Regulatory Assets and Liabilities [Line Items]    
Regulatory Assets, Current 0 0
Regulatory assets - noncurrent 42 24
StormCosts - RCE    
Regulatory Assets and Liabilities [Line Items]    
Regulatory Assets, Current 43 0
Regulatory assets - noncurrent 31 90
StormCosts - Jan 2024    
Regulatory Assets and Liabilities [Line Items]    
Regulatory Assets, Current 25 0
Regulatory assets - noncurrent $ 17 $ 48