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Investments (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 27, 2018 | Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Dec. 31, 2017
Investments |  |  |  |  |  |
Fair Value |  | $ 1,264 |  | $ 1,264 |  | $ 1,576
Total trading short-term investments |  | 1,264 |  | 1,264 |  | 1,576
Change in unrealized gains (losses) on trading securities |  | (2) | $ 33 | (24) | $ 65 |
Domestic equity securities |  |  |  |  |  |
Investments |  |  |  |  |  |
Fair Value Equity |  | 772 |  | 772 |  | 752
Foreign equity securities |  |  |  |  |  |
Investments |  |  |  |  |  |
Fair Value Equity |  | 302 |  | 302 |  | 319
Foreign equity securities | Denominated in foreign currencies |  |  |  |  |  |
Investments |  |  |  |  |  |
Fair Value Equity |  | 107 |  | 107 |  | 114
Foreign equity securities | Denominated in Euros |  |  |  |  |  |
Investments |  |  |  |  |  |
Fair Value Equity |  | 43 |  | 43 |  | 48
Foreign equity securities | Denominated in Japanese Yen |  |  |  |  |  |
Investments |  |  |  |  |  |
Fair Value Equity |  | 23 |  | 23 |  | 25
Foreign equity securities | Denominated in British pounds |  |  |  |  |  |
Investments |  |  |  |  |  |
Fair Value Equity |  | 20 |  | 20 |  | 20
Foreign equity securities | Denominated in Swiss Franc |  |  |  |  |  |
Investments |  |  |  |  |  |
Fair Value Equity |  | 6 |  | 6 |  | 6
Foreign equity securities | Denominated in other foreign currencies |  |  |  |  |  |
Investments |  |  |  |  |  |
Fair Value Equity |  | 15 |  | 15 |  | 15
Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries |  |  |  |  |  |
Investments |  |  |  |  |  |
Fair Value |  | 122 |  | 122 |  | 439
Proceeds from sale of securities | $ 314 |  |  |  |  |
Collateralized loan obligation |  |  |  |  |  |
Investments |  |  |  |  |  |
Fair Value |  | 30 |  | 30 |  | 29
High yield securities |  |  |  |  |  |
Investments |  |  |  |  |  |
Fair Value |  | 21 |  | 21 |  | 21
Money market funds held in trading accounts |  |  |  |  |  |
Investments |  |  |  |  |  |
Fair Value |  | 10 |  | 10 |  | 10
Money market funds held in trading accounts | Denominated in foreign currencies | Maximum |  |  |  |  |  |
Investments |  |  |  |  |  |
Fair Value |  | 1 |  | 1 |  | 1
Other trading securities |  |  |  |  |  |
Investments |  |  |  |  |  |
Fair Value |  | $ 7 |  | $ 7 |  | $ 6

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