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Investments - Total Investment Schedule (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Total Investments [Line Items] |  |
Current | $ 2,805 | $ 3,259
Long-term | 28,939 | 23,019
Total | 31,744 | 26,278
Debt securities available for sale |  |
Total Investments [Line Items] |  |
Current | 2,633 | 3,131
Long-term | 23,857 | 18,582
Total | 26,490 | 21,713
Mortgage loans |  |
Total Investments [Line Items] |  |
Current | 172 | 128
Long-term | 1,315 | 1,183
Total | 1,487 | 1,311
Other investments |  |
Total Investments [Line Items] |  |
Current | 0 | 0
Long-term | 3,767 | 3,254
Total | $ 3,767 | $ 3,254

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