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Investments - Total Investment Schedule (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Total Investments [Line Items] |  |
Current | $ 2,578 | $ 2,407
Long-term | 28,906 | 28,934
Total | 31,484 | 31,341
Debt securities available for sale |  |
Total Investments [Line Items] |  |
Current | 2,426 | 2,256
Long-term | 23,618 | 23,777
Total | 26,044 | 26,033
Mortgage loans |  |
Total Investments [Line Items] |  |
Current | 152 | 151
Long-term | 1,346 | 1,354
Total | 1,498 | 1,505
Other investments |  |
Total Investments [Line Items] |  |
Current | 0 | 0
Long-term | 3,942 | 3,803
Total | $ 3,942 | $ 3,803

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