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Investments - Total Investment Schedule (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Total Investments [Line Items] |  |
Current | $ 3,755 | $ 3,259
Long-term | 25,028 | 23,019
Total | 28,783 | 26,278
Debt securities available for sale |  |
Total Investments [Line Items] |  |
Current | 3,604 | 3,131
Long-term | 20,227 | 18,582
Total | 23,831 | 21,713
Mortgage loans |  |
Total Investments [Line Items] |  |
Current | 151 | 128
Long-term | 1,251 | 1,183
Total | 1,402 | 1,311
Other investments |  |
Total Investments [Line Items] |  |
Current | 0 | 0
Long-term | 3,550 | 3,254
Total | $ 3,550 | $ 3,254

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