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Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019 | Dec. 31, 2019
Investments |  |  |  |  |
Fair Value | $ 1,178 |  | $ 1,178 |  | $ 1,434
Total trading short-term investments | 1,178 |  | 1,178 |  | 1,434
Change in unrealized gains (losses) on trading securities | 113 | $ 38 | (97) | $ 126 |
Domestic equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 546 |  | 546 |  | 706
Domestic debt securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 389 |  | 389 |  | 409
Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 100 |  | 100 |  | 189
Foreign equity securities | Denominated in foreign currencies |  |  |  |  |
Investments |  |  |  |  |
Fair Value Equity | 0 |  | 0 |  | 62
Foreign equity securities | Denominated in Euros |  |  |  |  |
Investments |  |  |  |  |
Fair Value Equity |  |  |  |  | 32
Foreign equity securities | Denominated in Japanese Yen |  |  |  |  |
Investments |  |  |  |  |
Fair Value Equity |  |  |  |  | 12
Foreign equity securities | Denominated in British pounds |  |  |  |  |
Investments |  |  |  |  |
Fair Value Equity |  |  |  |  | 8
Foreign equity securities | Denominated in other foreign currencies |  |  |  |  |
Investments |  |  |  |  |
Fair Value Equity |  |  |  |  | 10
Foreign debt securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 54 |  | 54 |  | 43
Foreign debt securities | Denominated in foreign currencies |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 15 |  | 15 |  | 13
High yield securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 46 |  | 46 |  | 56
Money market funds held in trading accounts |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 24 |  | 24 |  | 12
Collateralized loan obligations |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 14 |  | 14 |  | 15
Other trading securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | $ 5 |  | $ 5 |  | $ 4

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