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Investments (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Total Investments [Line Items] |  |
Current investments | $ 2,426 | $ 2,522
Long-term investments | 16,410 | 15,732
Total investments | 18,836 | 18,254
Debt And Equity Securities Available For Sale [Member] |  |
Total Investments [Line Items] |  |
Current investments | 2,286 | 2,359
Long-term investments | 13,611 | 12,896
Total investments | 15,897 | 15,255
Mortgage Loans [Member] |  |
Total Investments [Line Items] |  |
Current investments | 123 | 145
Long-term investments | 1,215 | 1,216
Total investments | 1,338 | 1,361
Other Investments [Member] |  |
Total Investments [Line Items] |  |
Current investments | 17 | 18
Long-term investments | 1,584 | 1,620
Total investments | $ 1,601 | $ 1,638

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