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Investments (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Apr. 01, 2017 | Dec. 31, 2017
Investments |  |  |
Total trading short-term investments | $ 1,264 |  | $ 1,576
Change in unrealized gains (losses) on trading securities | (22) | $ 38 |
Domestic equity securities |  |  |
Investments |  |  |
Fair Value Equity | 744 |  | 752
Foreign equity securities |  |  |
Investments |  |  |
Fair Value Equity | 320 |  | 319
Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries |  |  |
Investments |  |  |
Fair Value | 135 |  | 439
Collateralized loan obligation |  |  |
Investments |  |  |
Fair Value | 28 |  | 29
High yield securities |  |  |
Investments |  |  |
Fair Value | 21 |  | 21
Money market funds held in trading accounts |  |  |
Investments |  |  |
Fair Value | 8 |  | 10
Other trading securities |  |  |
Investments |  |  |
Fair Value | 8 |  | 6
Denominated in foreign currencies | Money market funds | Maximum |  |  |
Investments |  |  |
Fair Value | 1 |  | 1
Denominated in foreign currencies | Foreign equity securities |  |  |
Investments |  |  |
Fair Value Equity | 111 |  | 114
Denominated in Euros | Foreign equity securities |  |  |
Investments |  |  |
Fair Value Equity | 47 |  | 48
Denominated in Japanese Yen | Foreign equity securities |  |  |
Investments |  |  |
Fair Value Equity | 24 |  | 25
Denominated in British pounds | Foreign equity securities |  |  |
Investments |  |  |
Fair Value Equity | 19 |  | 20
Denominated in Swiss Franc | Foreign equity securities |  |  |
Investments |  |  |
Fair Value Equity | 6 |  | 6
Denominated in other foreign currencies | Foreign equity securities |  |  |
Investments |  |  |
Fair Value Equity | $ 15 |  | $ 15

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