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Income Taxes - Reconciliation of effective tax rate (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
Expected income tax expense (benefit) computed on pre-tax income at weighted average income tax rate $ 424 $ 300 $ 110
Addition (reduction) in income tax expense (benefit) resulting from:      
Sale of subsidiaries/Bargain purchase option (45) 0 0
Investment income (39) (14) (13)
Change in tax rate 12 (1,179) (5)
Share based compensation (11) (13) (9)
Tax credits (5) (3) (10)
Base eroding tax/Alternative minimum tax 5 9 8
State taxes, net of U.S. federal tax benefit 4 6 11
Change in valuation allowance 3 4 (23)
Uncertain tax position 3 0 0
Dividend withholding taxes 3 9 11
Other 8 8 0
Income tax expense (benefit) $ 362 $ (873) $ 80