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Investments - Schedule of Total Investments (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Total Investments [Line Items] |  |
Current | $ 2,373 | $ 2,522
Long-term | 17,314 | 15,732
Total | 19,687 | 18,254
Debt securities available for sale |  |
Total Investments [Line Items] |  |
Current | 2,251 | 2,359
Long-term | 14,671 | 12,896
Total | 16,922 | 15,255
Mortgage loans |  |
Total Investments [Line Items] |  |
Current | 122 | 145
Long-term | 1,091 | 1,216
Total | 1,213 | 1,361
Other investments |  |
Total Investments [Line Items] |  |
Current | 0 | 18
Long-term | 1,552 | 1,620
Total | $ 1,552 | $ 1,638

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