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Investments - Total Investment Schedule (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Total Investments [Line Items] |  |
Current | $ 3,145 | $ 2,778
Long-term | 21,667 | 21,113
Total | 24,812 | 23,891
Disposal Group, Held-for-sale, Not Discontinued Operations |  |
Total Investments [Line Items] |  |
Long-term |  | 17
Debt securities available for sale |  |
Total Investments [Line Items] |  |
Current | 3,027 | 2,718
Long-term | 17,374 | 17,562
Total | 20,401 | 20,280
Mortgage loans |  |
Total Investments [Line Items] |  |
Current | 116 | 55
Long-term | 1,157 | 989
Total | 1,273 | 1,044
Other investments |  |
Total Investments [Line Items] |  |
Current | 2 | 5
Long-term | 3,136 | 2,562
Total | $ 3,138 | $ 2,567

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