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Investments (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Apr. 03, 2021 | Mar. 28, 2020 | Dec. 31, 2020
Investments |  |  |
Total trading short-term investments | $ 1,384 |  | $ 1,465
Change in unrealized gains (losses) on trading securities | 65 | $ (236) |
Denominated in foreign currencies |  |  |
Investments |  |  |
Total trading short-term investments | 42 |  | 29
Domestic equity securities |  |  |
Investments |  |  |
Fair Value | 697 |  | 702
Domestic debt securities |  |  |
Investments |  |  |
Fair Value | 392 |  | 496
Foreign equity securities |  |  |
Investments |  |  |
Fair Value | 149 |  | 133
Foreign debt securities |  |  |
Investments |  |  |
Fair Value | 106 |  | 68
Money market funds held in trading accounts |  |  |
Investments |  |  |
Fair Value | 18 |  | 47
Other trading securities |  |  |
Investments |  |  |
Fair Value | $ 22 |  | $ 19

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