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Investments - Total Investment Schedule (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Total Investments [Line Items] |  |
Current | $ 2,134 | $ 2,407
Long-term | 31,553 | 28,934
Total | 33,687 | 31,341
Debt securities available for sale |  |
Total Investments [Line Items] |  |
Current | 1,978 | 2,256
Long-term | 25,857 | 23,777
Total | 27,835 | 26,033
Mortgage loans |  |
Total Investments [Line Items] |  |
Current | 156 | 151
Long-term | 1,367 | 1,354
Total | 1,523 | 1,505
Other investments |  |
Total Investments [Line Items] |  |
Current | 0 | 0
Long-term | 4,329 | 3,803
Total | $ 4,329 | $ 3,803

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