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Income Taxes - Valuation Allowance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Movement in valuation allowances and reserves      
Valuation allowance at beginning of period $ 542 $ 331 $ 87
Change in deferred tax asset positions 184 211 244
Valuation allowance at end of period $ 726 $ 542 $ 331