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Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 01, 2017 | Jul. 02, 2016 | Jul. 01, 2017 | Jul. 02, 2016 | Dec. 31, 2016
Investments |  |  |  |  |
Unrealized gains (losses) on trading securities | $ 33 | $ 9 | $ 65 | $ 13 |
Trading securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 1,286 |  | 1,286 |  | $ 1,236
Fair Value | 1,391 |  | 1,391 |  | 1,277
Domestic equity securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 612 |  | 612 |  | 444
Fair Value | 687 |  | 687 |  | 482
Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 272 |  | 272 |  | 437
Fair Value | 274 |  | 274 |  | 437
Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 261 |  | 261 |  | 198
Fair Value | 289 |  | 289 |  | 199
High yield securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 108 |  | 108 |  | 114
Fair Value | 108 |  | 108 |  | 115
Money market funds held in trading accounts |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 16 |  | 16 |  | 13
Fair Value | 16 |  | 16 |  | 13
Collateralized loan obligation |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 13 |  | 13 |  | 25
Fair Value | 13 |  | 13 |  | 26
Other trading securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 4 |  | 4 |  | 5
Fair Value | 4 |  | 4 |  | 5
Denominated in foreign currencies | Money market funds |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 1 |  | 1 |  | 1
Denominated in foreign currencies | Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 104 |  | 104 |  | 91
Denominated in Euros | Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 43 |  | 43 |  | 35
Denominated in Japanese Yen | Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 22 |  | 22 |  | 20
Denominated in British pounds | Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 18 |  | 18 |  | 16
Denominated in Swiss Franc | Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 6 |  | 6 |  | 6
Denominated in other foreign currencies | Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | $ 15 |  | $ 15 |  | $ 14

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