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Income Taxes (Schedule Of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current income tax expense (benefit):      
United States Federal, current income tax expense (benefit) $ 501 $ 10 $ (219)
Various states, current income tax expense (benefit) 65 9  
Canada, current income tax expense (benefit) (7) (3)  
Total current income tax expense (benefit) 559 16 (219)
Deferred income tax expense (benefit):      
United States Federal, deferred income tax expense (benefit) 1,090 18 (304)
Various states, deferred income tax expense (benefit) 82 22 (24)
Canada,deferred income tax expense (benefit) 7 9  
Total deferred income tax expense (benefit) 1,179 49 (328)
Total income tax expense (benefit) $ 1,738 $ 65 $ (547)