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Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Investments |  |  |  |  |
Fair Value | $ 1,440 |  | $ 1,440 |  | $ 1,336
Total trading short-term investments | 1,440 |  | 1,440 |  | 1,336
Change in unrealized gains (losses) on trading securities | 38 | $ (2) | 126 | $ (24) |
Domestic equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value Equity | 689 |  | 689 |  | 632
Domestic debt securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 392 |  | 392 |  | 268
Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value Equity | 195 |  | 195 |  | 218
Foreign equity securities | Denominated in foreign currencies |  |  |  |  |
Investments |  |  |  |  |
Fair Value Equity | 59 |  | 59 |  | 66
Foreign equity securities | Denominated in Euros |  |  |  |  |
Investments |  |  |  |  |
Fair Value Equity | 29 |  | 29 |  | 25
Foreign equity securities | Denominated in Japanese Yen |  |  |  |  |
Investments |  |  |  |  |
Fair Value Equity | 11 |  | 11 |  | 20
Foreign equity securities | Denominated in British pounds |  |  |  |  |
Investments |  |  |  |  |
Fair Value Equity | 9 |  | 9 |  | 9
Foreign equity securities | Denominated in Swiss Franc |  |  |  |  |
Investments |  |  |  |  |
Fair Value Equity | 4 |  | 4 |  | 3
Foreign equity securities | Denominated in other foreign currencies |  |  |  |  |
Investments |  |  |  |  |
Fair Value Equity | 6 |  | 6 |  | 9
High yield securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 57 |  | 57 |  | 19
Foreign debt securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 49 |  | 49 |  | 16
Collateralized loan obligation |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 27 |  | 27 |  | 28
Money market funds held in trading accounts |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 21 |  | 21 |  | 146
Money market funds held in trading accounts | Denominated in foreign currencies |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 1 |  | 1 |  | 10
Term deposits |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 5 |  | 5 |  | $ 9
Other trading securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | $ 5 |  | $ 5 |  |

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