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Income Taxes - Provision for Federal & Foreign Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Federal income tax expense (benefit):      
Current $ 1,352 $ 1,574 $ 1,618
Deferred (604) (503) (776)
Total federal income tax expense 748 1,071 842
Foreign income tax expense:      
Current 120 102 87
Deferred 16 5 19
Total foreign income tax expense 136 107 106
Total federal and foreign income tax expense $ 884 $ 1,178 $ 948