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Income Taxes - Summary of Income Tax Contingencies (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Changes in uncertain income tax positions |  |
Balance, beginning of year | $ 198 | $ 179
Increases in tax positions for prior years | 4 | 3
Increases in tax positions for current year | 32 | 31
Decreases in tax positions for prior years | (2) | (15)
Decreases in tax positions for current years | (3) | 0
Decreases related to settlement with taxing authorities | (58) | 0
Balance, end of year | $ 171 | $ 198

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