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Regulatory Assets and Liabilities, Regulatory Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Regulatory Assets [Line Items]    
Regulatory Asset, Current $ 24 $ 43 [1]
Regulatory Asset, Noncurrent 376 359 [1]
Regulatory assets not currently earning a return 78 126
Pension and Retiree Medical Obligations    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 5 4 [1]
Regulatory Asset, Noncurrent 150 156 [1]
Excess deferred taxes - TCJA    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 1 1 [1]
Regulatory Asset, Noncurrent 32 45 [1]
Recoverable Deferred Taxes on AFUDC Recorded in Plant    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 0 0 [1]
Regulatory Asset, Noncurrent 52 46 [1]
Net AROs    
Regulatory Assets [Line Items]    
Regulatory Asset, Current [2] 0 0 [1]
Regulatory Asset, Noncurrent [2] 83 70 [1]
Losses on Reacquired Debt    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 1 1 [1]
Regulatory Asset, Noncurrent 16 17 [1]
Other    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 17 37 [1]
Regulatory Asset, Noncurrent 29 25 [1]
Excess liability insurance costs    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 0 0 [1]
Regulatory Asset, Noncurrent $ 14 $ 0 [1]
Regulatory Asset, Amortization Period 2 years  
[1] Prior period amounts have been reclassified to conform with current year presentation.
[2] Includes amounts recorded for future recovery of AROs.