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Investments - Schedule of Total Investments (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Total Investments [Line Items] |  |
Current | $ 2,778 | $ 3,117
Long-term | 21,113 | 23,025
Total | 23,891 | 26,142
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 | 2,718 | 3,009
Long-term | 17,562 | 20,231
Total | 20,280 | 23,240
Mortgage loans |  |
Total Investments [Line Items] |  |
Current | 55 | 58
Long-term | 989 | 844
Total | 1,044 | 902
Other investments |  |
Total Investments [Line Items] |  |
Current | 5 | 50
Long-term | 2,562 | 1,950
Total | $ 2,567 | $ 2,000

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