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Investments - Schedule of Fair Values by Classification (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Marketable Securities [Line Items] |  |
Total interest-bearing securities | $ 8,576 | $ 10,404
Available-for-sale investments |  |
Marketable Securities [Line Items] |  |
Cash and cash equivalents | 8,576 | 10,404
Total interest-bearing securities | $ 8,576 | $ 10,404

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