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Investments - Total Investment Schedule (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Total Investments [Line Items] |  |
Current | $ 3,288 | $ 3,259
Long-term | 24,074 | 23,019
Total | 27,362 | 26,278
Debt securities available for sale |  |
Total Investments [Line Items] |  |
Current | 3,121 | 3,131
Long-term | 19,505 | 18,582
Total | 22,626 | 21,713
Mortgage loans |  |
Total Investments [Line Items] |  |
Current | 167 | 128
Long-term | 1,195 | 1,183
Total | 1,362 | 1,311
Other investments |  |
Total Investments [Line Items] |  |
Current | 0 | 0
Long-term | 3,374 | 3,254
Total | $ 3,374 | $ 3,254

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