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Regulatory Assets and Liabilities, Regulatory Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Regulatory Assets [Line Items]    
Regulatory Asset, Current $ 43 $ 30
Regulatory Asset, Noncurrent $ 359 349
Regulatory Asset, Amortization Period 1 year  
Regulatory assets not currently earning a return $ 126 123
Pension and Retiree Medical Obligations    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 4 2
Regulatory Asset, Noncurrent 156 147
Texas revenue surcharge [Member]    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 30 21
Regulatory Asset, Noncurrent 0 0
Excess deferred taxes - TCJA    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 1 1
Regulatory Asset, Noncurrent 45 47
Recoverable Deferred Taxes on AFUDC Recorded in Plant    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 0 0
Regulatory Asset, Noncurrent 46 44
Net AROs    
Regulatory Assets [Line Items]    
Regulatory Asset, Current [1] 0 0
Regulatory Asset, Noncurrent [1] 70 59
Losses on Reacquired Debt    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 1 1
Regulatory Asset, Noncurrent 17 18
Other    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 7 5
Regulatory Asset, Noncurrent $ 25 $ 34
[1] Includes amounts recorded for future recovery of AROs.