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Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |  |  |  |  |
Unrecognized Tax Benefits | $ 23 | $ 25 | $ 23 | $ 25 | $ 27 | $ 26 | $ 23 | $ 22
Gross increases - tax positions in current period | 1 | 2 | 2 | 4 |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions | (1) | 0 | (1) | 0 |  |  |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 4 | 0 | 4 | 1 |  |  |  |
Balance, end of period | $ 23 | $ 25 | $ 23 | $ 25 |  |  |  |

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