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Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
Current - U.S. Federal $ 582 $ 550 $ 486
International 0 (1) 2
Total current 582 549 488
Deferred - U.S. Federal 6 (124) 52
International (4) 18 (6)
Total deferred 2 (106) 46
Total income tax expense (benefit) $ 584 $ 443 $ 534