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Income Taxes Summary of Changes to Valuation Allowance on Deferred Tax Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Valuation Allowance [Line Items]      
Deferred tax assets, valuation allowance, beginning of period $ 758 $ 114 $ 415
Changes to Related Gross Deferred Tax Assets 112 320 23
Change/(Release) 1 324 (324)
Deferred tax assets, valuation allowance, end of period 871 758 114
U.S. foreign tax credit carryforward      
Valuation Allowance [Line Items]      
Deferred tax assets, valuation allowance, beginning of period 635 0 333
Changes to Related Gross Deferred Tax Assets 101 308 0
Change/(Release) 0 327 (333)
Deferred tax assets, valuation allowance, end of period 736 635 0
Net operating and capital losses      
Valuation Allowance [Line Items]      
Deferred tax assets, valuation allowance, beginning of period 123 114 82
Changes to Related Gross Deferred Tax Assets 11 12 23
Change/(Release) 1 (3) 9
Deferred tax assets, valuation allowance, end of period $ 135 $ 123 $ 114