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Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 01, 2016 | Oct. 03, 2015 | Oct. 01, 2016 | Oct. 03, 2015 | Dec. 31, 2015
Investments |  |  |  |  |
Total short term investments, amortized cost | $ 1,150 |  | $ 1,150 |  | $ 1,269
Total short term investments, fair value | 1,180 |  | 1,180 |  | 1,254
Unrealized gains (losses) on trading securities | 27 | $ (22) | 41 | $ (21) |
Available-for-sale securities. |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost |  |  |  |  | 81
Fair Value |  |  |  |  | 81
Money market funds |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost |  |  |  |  | 81
Fair Value |  |  |  |  | 81
Trading securities. |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 1,150 |  | 1,150 |  | 1,188
Fair Value | 1,180 |  | 1,180 |  | 1,173
Domestic equity securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 466 |  | 466 |  | 475
Fair Value | 491 |  | 491 |  | 466
Domestic debt securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 400 |  | 400 |  | 452
Fair Value | 403 |  | 403 |  | 450
Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 158 |  | 158 |  | 120
Fair Value | 159 |  | 159 |  | 120
High yield trading debt securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 104 |  | 104 |  | 108
Fair Value | 105 |  | 105 |  | 104
Collateralized loan obligation |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 14 |  | 14 |  | 10
Fair Value | 14 |  | 14 |  | 10
Money market funds held in trading accounts |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 8 |  | 8 |  | 22
Fair Value | 8 |  | 8 |  | 22
Other trading securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost |  |  |  |  | 1
Fair Value |  |  |  |  | 1
Denominated in foreign currencies | Money market funds |  |  |  |  |
Investments |  |  |  |  |
Fair Value |  |  |  |  | 3
Denominated in foreign currencies | Money market funds | Maximum |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 1 |  | 1 |  |
Denominated in foreign currencies | Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 91 |  | 91 |  | 80
Denominated in Euros | Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 34 |  | 34 |  | 25
Denominated in Japanese Yen | Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 19 |  | 19 |  | 20
Denominated in British pounds | Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 15 |  | 15 |  | 15
Denominated in Swiss Franc | Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 7 |  | 7 |  | 7
Denominated in other foreign currencies | Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Fair Value | $ 16 |  | $ 16 |  | $ 13

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