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Investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Investments |  |  |
Unrealized gains (losses) on trading securities | $ 49 | $ (12) | $ (7)
Total short term investments, amortized cost | 1,236 | 1,269 |
Total short term investments, fair value | 1,277 | 1,254 |
Available-for-sale securities |  |  |
Investments |  |  |
Amortized Cost |  | 81 |
Fair Value |  | 81 |
Money market funds |  |  |
Investments |  |  |
Amortized Cost |  | 81 |
Fair Value |  | 81 |
Money market funds | Denominated in other foreign currencies |  |  |
Investments |  |  |
Fair Value | 1 | 3 |
Trading securities |  |  |
Investments |  |  |
Amortized Cost | 1,236 | 1,188 |
Fair Value | 1,277 | 1,173 |
Domestic equity securities |  |  |
Investments |  |  |
Amortized Cost | 444 | 475 |
Fair Value | 482 | 466 |
Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries |  |  |
Investments |  |  |
Amortized Cost | 437 | 452 |
Fair Value | 437 | 450 |
Foreign equity securities |  |  |
Investments |  |  |
Amortized Cost | 198 | 120 |
Fair Value | 199 | 120 |
Foreign equity securities | Denominated in foreign currencies |  |  |
Investments |  |  |
Fair Value | 91 | 80 |
Foreign equity securities | Denominated in Euros |  |  |
Investments |  |  |
Fair Value | 35 | 25 |
Foreign equity securities | Denominated in Japanese Yen |  |  |
Investments |  |  |
Fair Value | 20 | 20 |
Foreign equity securities | Denominated in British pounds |  |  |
Investments |  |  |
Fair Value | 16 | 15 |
Foreign equity securities | Denominated in Swiss Franc |  |  |
Investments |  |  |
Fair Value | 6 | 7 |
Foreign equity securities | Denominated in other foreign currencies |  |  |
Investments |  |  |
Fair Value | 14 | 13 |
High yield securities |  |  |
Investments |  |  |
Amortized Cost | 114 | 108 |
Fair Value | 115 | 104 |
Collateralized loan obligation |  |  |
Investments |  |  |
Amortized Cost | 25 | 10 |
Fair Value | 26 | 10 |
Money market funds held in trading accounts |  |  |
Investments |  |  |
Amortized Cost | 13 | 22 |
Fair Value | 13 | 22 |
Other trading investments |  |  |
Investments |  |  |
Amortized Cost | 5 | 1 |
Fair Value | 5 | $ 1 |
Morocco | Grain trading and poultry business |  |  |
Investments |  |  |
Cost method investment ownership percentage |  | 12.00% |
Amount invested under cost method |  | $ 18 |
Other non-current assets |  |  |
Investments |  |  |
Cost method investments | $ 28 | $ 20 |

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