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Financial Instruments - Total Short-term and Long-term Investments (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Short-term investments |  |  |
Equity securities |  | $ 1,600 | $ 2,150
Available-for-sale debt securities |  | 15,091 | 15,362
Held-to-maturity debt securities |  | 1,003 | 1,138
Total Short-term investments | [1] | 17,694 | 18,650
Long-term investments |  |  |
Equity securities |  | 1,223 | 1,440
Trading equity securities |  | 50 | 73
Available-for-sale debt securities |  | 491 | 5,090
Held-to-maturity debt securities |  | 59 | 4
Private equity investments carried at equity-method or cost |  | 944 | 408
Total Long-term investments | [1] | 2,767 | 7,015
Held-to-maturity cash equivalents |  | $ 199 | $ 719
[1] | Amounts may not add due to rounding.

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