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Accounting For Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Federal income taxes at statutory rates $ 38 $ 29 $ 29    
Tax effect of regulatory treatment of utility plant differences (12) (12) (12)    
State income tax expense 2 2 2    
Flow through related to deduction of meters and mixed service costs (23) (48) (35)    
Tax credits (1) (3) 0    
Other (1) (2) (1)    
Total income tax expense (benefit) $ 3 $ (34) $ (17)    
Federal statutory tax rate 21.00% 21.00% 21.00% 21.00% 35.00%
Tax effect of regulatory treatment of utility plant differences (6.60%) (8.90%) (9.00%)    
State income tax expense 0.90% 1.50% 1.20%    
Flow through related to deduction of meters and mixed service costs (12.40%) (34.90%) (25.00%)    
Tax credits (0.60%) (1.70%) (0.20%)    
Other (0.80%) (1.40%) (0.50%)    
Effective Income Tax Rate Reconciliation, Percent 1.50% (24.40%) (12.50%)