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Financial Instruments - Investments by Classification Type (Details) - USD ($)
$ in Millions
Apr. 04, 2021
Dec. 31, 2020
Short-term investments    
Equity securities with readily determinable fair values [1] $ 1,427 $ 567
Available-for-sale debt securities 8,292 9,709
Held-to-maturity debt securities 2,180 161
Total Short-term investments 11,899 10,437
Long-term investments    
Equity securities with readily determinable fair values 3,123 2,809
Available-for-sale debt securities 75 128
Held-to-maturity debt securities 31 37
Private equity securities at cost [2] 467 432
Total Long-term investments 3,696 3,406
Equity-method investments 16,532 16,856
Total long-term investments and equity-method investments 20,228 20,262
Held-to-maturity cash equivalents $ 60 $ 89
[1] As of April 4, 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