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Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 02, 2021 | Sep. 26, 2020 | Oct. 02, 2021 | Sep. 26, 2020 | Dec. 31, 2020
Investments |  |  |  |  |
Total trading short-term investments | $ 1,516 |  | $ 1,516 |  | $ 1,465
Change in unrealized gains (losses) on trading securities | (9) | $ 53 | 7 | $ (45) |
Long term investments | 144 |  | 144 |  | 87
Denominated in foreign currencies |  |  |  |  |
Investments |  |  |  |  |
Total trading short-term investments | 51 |  | 51 |  | 29
Domestic debt securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 724 |  | 724 |  | 496
Domestic equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 446 |  | 446 |  | 702
Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 192 |  | 192 |  | 133
Foreign debt securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 124 |  | 124 |  | 68
Money market funds held in trading accounts |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 9 |  | 9 |  | 47
Other trading investments |  |  |  |  |
Investments |  |  |  |  |
Fair Value | $ 21 |  | $ 21 |  | $ 19

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