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Income Taxes (Schedule Of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current income tax expense (benefit):      
United States Federal, current income tax expense $ 441 $ 501 $ 10
Various states, current income tax expense 27 65 9
Canada, current income tax expense (3) (7) (3)
Total current income tax expense 465 559 16
Deferred income tax expense:      
United States Federal, deferred income tax expense 365 1,090 18
Various states, deferred income tax expense 11 82 22
Canada,deferred income tax expense 0 7 9
Total deferred income tax expense 376 1,179 49
Total income tax expense $ 841 $ 1,738 $ 65