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Financial Instruments - Total Short-Term and Long-Term Investments and Equity Method Investments (Details) - USD ($) $ in Millions | Jun. 28, 2020 | Dec. 31, 2019
--- | --- | ---
Short-term investments |  |  |
Equity securities with readily determinable fair value | [1] | $ 13,033 | $ 705
Available-for-sale debt securities |  | 7,672 | 6,687
Held-to-maturity debt securities |  | 288 | 1,133
Total Short-term investments |  | 20,993 | 8,525
Long-term investments |  |  |
Equity securities with readily determinable fair values |  | 2,072 | 1,902
Available-for-sale debt securities |  | 254 | 315
Held-to-maturity debt securities |  | 43 | 42
Private equity securities at cost |  | 772 | 756
Total Long-term investments | [2] | 3,142 | 3,014
Equity-method investments | [2] | 15,578 | 17,133
Total long-term investments and equity-method investments |  | 18,720 | 20,147
Held-to-maturity cash equivalents |  | $ 119 | $ 163
[1] | As of June 28, 2020 and December 31, 2019, equity securities with readily determinable fair values included money market funds primarily invested in U.S. Treasury and government debt. As of June 28, 2020, $11.4 billion of proceeds from the Upjohn debt transactions (see Note 7D) are invested in money market funds and included in Restricted short-term investments in the condensed consolidated balance sheet.
[2] | Amounts may not add due to rounding.

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