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Investments - Schedule of Fair Values by Classification (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total interest-bearing securities | $ 8,302 | $ 11,486
Available-for-sale investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 8,302 | 11,486
Total interest-bearing securities | $ 8,302 | $ 11,486

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