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Income Taxes - Deferred Tax Valuation Allowance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred tax valuation allowance, rollfoward      
Balance at beginning of year $ 146    
Balance at end of year 181 $ 146  
Deferred tax asset valuation allowance      
Deferred tax valuation allowance, rollfoward      
Balance at beginning of year 146 115 $ 83
Charged to Income tax expense 35 31 32
Balance at end of year $ 181 $ 146 $ 115