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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

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