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Income Taxes (Schedule Of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current income tax expense (benefit):      
United States Federal, current income tax expense (benefit) $ 10 $ (219) $ (3)
Various states, current income tax expense (benefit) 9   (2)
Canada, current income tax expense (benefit) (3)    
Total current income tax expense (benefit) 16 (219) (5)
Deferred income tax expense (benefit):      
United States Federal, deferred income tax expense (benefit) 18 (304) 8
Various states, deferred income tax expense (benefit) 22 (24) (33)
Canada,deferred income tax expense (benefit) 9    
Total deferred income tax expense (benefit) 49 (328) (25)
Total income tax expense (benefit) $ 65 $ (547) $ (30)