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Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current [Abstract]      
State $ 4 $ 10 $ (7)
Total Current 4 10 (7)
Deferred [Abstract]      
Federal (69) 58 125
State 41 20 40
Total Deferred (28) 78 165
Total income tax expense (benefit) (24) 88 158
Income taxes charged (credited) to equity of Frontier [Abstract]      
Deferred income taxes (benefits) arising from the recognition of additional pension/OPEB liability (6) 6 8
Total income tax expense (benefit) $ (30) $ 94 $ 166