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Investments - Total Investments Schedule (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Total Investments [Line Items] |  |
Current | $ 3,259 | $ 2,778
Long-term | 23,019 | 21,096
Long-term |  | 21,113
Total | 26,278 | 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 | 3,131 | 2,718
Long-term | 18,582 |
Long-term |  | 17,562
Total | 21,713 | 20,280
Mortgage loans |  |
Total Investments [Line Items] |  |
Current | 128 | 55
Long-term | 1,183 |
Long-term |  | 989
Total | 1,311 | 1,044
Other investments |  |
Total Investments [Line Items] |  |
Current | 0 | 5
Long-term | 3,254 |
Long-term |  | 2,562
Total | $ 3,254 | $ 2,567

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