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Fair Value Measurements - Schedule of Investment Maturities (Details) - Fair Value - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Less than 1 year | $ 4 | $ 83
1 - 5 years | 62 | 37
5 - 10 years | 17 | 17
Greater than 10 years | 46 | 44
Total Investments at Fair Value | $ 129 | $ 181

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