Financial Instruments - Total Short-Term and Long-Term Investments and Equity Method Investments (Details) - USD ($) $ in Millions		Sep. 27, 2020	Dec. 31, 2019
Short-term investments
Equity securities with readily determinable fair value	[1]	$ 12,273	$ 705
Available-for-sale debt securities		7,859	6,687
Held-to-maturity debt securities		193	1,133
Total Short-term investments		20,325	8,525
Long-term investments
Equity securities with readily determinable fair values		2,092	1,902
Available-for-sale debt securities		149	315
Held-to-maturity debt securities		37	42
Private equity securities at cost		780	756
Total Long-term investments		3,059	3,014
Equity-method investments		15,949	17,133
Total long-term investments and equity-method investments		19,008	20,147
Held-to-maturity cash equivalents		$ 130	$ 163

[1] As of September 27, 2020 and December 31, 2019, included money market funds primarily invested in U.S. Treasury and government debt. As of September 27, 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.