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Investments (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Total Investments [Line Items] |  |
Current investments | $ 2,831 | $ 2,373
Long-term investments | 20,216 | 17,314
Total investments | 23,047 | 19,687
Debt securities available for sale |  |
Total Investments [Line Items] |  |
Current investments | 2,578 | 2,251
Long-term investments | 17,820 | 14,671
Total investments | 20,398 | 16,922
Mortgage loans |  |
Total Investments [Line Items] |  |
Current investments | 253 | 122
Long-term investments | 871 | 1,091
Total investments | 1,124 | 1,213
Other investments |  |
Total Investments [Line Items] |  |
Current investments | 0 | 0
Long-term investments | 1,525 | 1,552
Total investments | $ 1,525 | $ 1,552

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