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Income Taxes - Summary of Income Tax Contingencies (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Changes in uncertain income tax positions |  |
Balance, beginning of year | $ 433 | $ 406
Increases in tax positions for prior years | 9 | 14
Increases in tax positions for current year | 13 | 20
Decreases in tax positions for prior years | (24) | (7)
Decreases related to settlement with taxing authorities | (252) | 0
Balance, end of year | $ 179 | $ 433

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