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Income Taxes (Schedule Of Components Of Income Tax Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current Income Tax Expense [Abstract]      
Current federal income tax expense $ 1,026 $ 1,000 $ 1,144
Current state income tax expense 259 254 287
Current foreign income tax expense 6 8 5
Total current income tax expense 1,291 1,262 1,436
Deferred Income Tax Expense [Abstract]      
Deferred federal income tax expense (benefit) 295 417 344
Deferred state income tax expense 45 128 5
Deferred foreign income tax expense (benefit)   21 (10)
Total deferred income tax expense (benefit) 340 566 339
Total income tax expense (benefit) $ 1,631 $ 1,828 $ 1,775