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Financial Instruments - Total Short-Term and Long-Term Investments (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Financial Instruments [Abstract] |  |  |
Equity securities |  | $ 1,213 | $ 2,150
Available-for-sale debt securities |  | 11,256 | 15,362
Held-to-maturity debt securities |  | 1,211 | 1,138
Total Short-term investments | [1] | 13,680 | 18,650
Equity securities |  | 1,563 | 1,440
Trading debt securities |  | 50 | 73
Available-for-sale debt securities |  | 3,742 | 5,090
Held-to-maturity debt securities |  | 63 | 4
Private equity investments carried at equity-method or cost |  | 1,027 | 408
Total Long-term investments | [1] | 6,444 | 7,015
Held-to-maturity cash equivalents |  | $ 237 | $ 719
[1] | Amounts may not add due to rounding.

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