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.