Financial Instruments - Investments by Classification Type (Details) - USD ($) $ in Millions		Oct. 03, 2021	Dec. 31, 2020
Short-term investments
Equity securities with readily determinable fair values	[1]	$ 2,367	$ 567
Available-for-sale debt securities		22,887	9,709
Held-to-maturity debt securities		2,476	161
Total Short-term investments		27,730	10,437
Long-term investments
Equity securities with readily determinable fair values		4,165	2,809
Available-for-sale debt securities		434	128
Held-to-maturity debt securities		32	37
Private equity securities at cost	[2]	616	432
Total Long-term investments		5,248	3,406
Equity-method investments		16,349	16,856
Total long-term investments and equity-method investments		21,596	20,262
Held-to-maturity cash equivalents		$ 467	$ 89

[1] As of October 3, 2021 and December 31, 2020, includes money market funds primarily invested in U.S. Treasury and government debt.

[2] Represent investments in the life sciences sector