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Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |  |  |  |  |
Unrecognized Tax Benefits | $ 25 | $ 27 | $ 25 | $ 27 | $ 24 | $ 24 | $ 27 | $ 26
Gross increases - tax positions in current period | 1 | 0 | 1 | 1 |  |  |  |
Balance, end of period | 25 | 27 | 25 | 27 |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |  |  |
Unrecognized Tax Benefits | 25 | $ 27 | 25 | $ 27 | $ 24 | $ 24 | $ 27 | $ 26
TaxYear2022 and Prior |  |  |  |  |  |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |  |  |  |  |
Unrecognized Tax Benefits | 14 |  | 14 |  |  |  |  |
Balance, end of period | 14 |  | 14 |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |  |  |
Unrecognized Tax Benefits | $ 14 |  | $ 14 |  |  |  |  |

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