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Note 7 - Income Taxes - Schedule of Income Tax Expense Components (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Federal, current $ 1,417 $ 1,465 $ 1,446
State, current 314 340 347
Foreign, current 6 7 8
Total current tax expense 1,737 1,812 1,801
Federal, deferred 219 320 199
State, deferred [a] [1] (104) (59) (44)
Foreign, deferred 2 1 (1)
Total deferred and other tax expense 117 262 154
Total income tax expense $ 1,854 $ 2,074 $ 1,955
[1] In 2023, Nebraska, Iowa, Kansas, and Arkansas enacted corporate income tax legislation that resulted in a $114 million reduction of our deferred tax expense. In 2022, Nebraska, Iowa, Arkansas, and Idaho enacted corporate income tax legislation that resulted in a $95 million reduction of our deferred tax expense.