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Income Taxes - Income Tax Expense Reconciled to Tax Computed at Statutory Rates (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Expense      
Federal Income Taxes $ 1,137 $ 1,040 $ 762
State Income Taxes 121 139 117
Other (10) (9) (17)
Total Income Tax Expense $ 1,248 $ 1,170 $ 862
Rate      
Federal Income Taxes 21.00% 21.00% 21.00%
State Income Taxes 2.20% 2.80% 3.20%
Other (0.10%) (0.20%) (0.40%)
Income Tax Rate 23.10% 23.60% 23.80%