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Investments (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Total Investments [Line Items] |  |
Current investments | $ 2,462 | $ 2,522
Long-term investments | 16,973 | 15,732
Total investments | 19,435 | 18,254
Debt securities available for sale |  |
Total Investments [Line Items] |  |
Current investments | 2,270 | 2,359
Long-term investments | 14,199 | 12,896
Total investments | 16,469 | 15,255
Mortgage loans |  |
Total Investments [Line Items] |  |
Current investments | 175 | 145
Long-term investments | 1,170 | 1,216
Total investments | 1,345 | 1,361
Other investments |  |
Total Investments [Line Items] |  |
Current investments | 17 | 18
Long-term investments | 1,604 | 1,620
Total investments | $ 1,621 | $ 1,638

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