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Investments (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Total Investments [Line Items] |  |
Current investments | $ 2,632 | $ 2,373
Long-term investments | 16,840 | 17,314
Total investments | 19,472 | 19,687
Debt securities available for sale |  |
Total Investments [Line Items] |  |
Current investments | 2,451 | 2,251
Long-term investments | 14,266 | 14,671
Total investments | 16,717 | 16,922
Mortgage loans |  |
Total Investments [Line Items] |  |
Current investments | 181 | 122
Long-term investments | 983 | 1,091
Total investments | 1,164 | 1,213
Other investments |  |
Total Investments [Line Items] |  |
Current investments | 0 | 0
Long-term investments | 1,591 | 1,552
Total investments | $ 1,591 | $ 1,552

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