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Investments - Schedule of Total Investments (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Total Investments [Line Items] |  |
Current | $ 3,000 | $ 2,373
Long-term | 20,812 | 17,314
Total | 23,812 | 19,687
Debt securities available for sale |  |
Total Investments [Line Items] |  |
Current | 2,774 | 2,251
Long-term | 18,414 | 14,671
Total | 21,188 | 16,922
Mortgage loans |  |
Total Investments [Line Items] |  |
Current | 226 | 122
Long-term | 821 | 1,091
Total | 1,047 | 1,213
Other investments |  |
Total Investments [Line Items] |  |
Current | 0 | 0
Long-term | 1,577 | 1,552
Total | $ 1,577 | $ 1,552

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