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Investments (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Total Investments [Line Items] |  |
Current investments | $ 2,334 | $ 2,522
Long-term investments | 17,342 | 15,732
Total investments | 19,676 | 18,254
Debt securities available for sale |  |
Total Investments [Line Items] |  |
Current investments | 2,175 | 2,359
Long-term investments | 14,583 | 12,896
Total investments | 16,758 | 15,255
Mortgage loans |  |
Total Investments [Line Items] |  |
Current investments | 159 | 145
Long-term investments | 1,131 | 1,216
Total investments | 1,290 | 1,361
Other investments |  |
Total Investments [Line Items] |  |
Current investments | 0 | 18
Long-term investments | 1,628 | 1,620
Total investments | $ 1,628 | $ 1,638

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