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Investments (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 27, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investments |  |  |  |
Change in unrealized gains (losses) on trading securities |  | $ 146 | $ 49 | $ (12)
Amortized Cost |  | 1,387 | 1,236 |
Fair Value |  | 1,576 | 1,277 |
Money market funds | Denominated in other foreign currencies |  |  |  |
Investments |  |  |  |
Fair Value |  |  | 1 |
Money market funds | Denominated in other foreign currencies | Maximum |  |  |  |
Investments |  |  |  |
Fair Value |  | 1 |  |
Domestic equity securities |  |  |  |
Investments |  |  |  |
Amortized Cost |  | 619 | 444 |
Fair Value |  | 752 | 482 |
Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries |  |  |  |
Investments |  |  |  |
Amortized Cost |  | 438 | 437 |
Fair Value |  | 439 | 437 |
Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries | Subsequent Event |  |  |  |
Investments |  |  |  |
Proceeds from sale of securities | $ 314 |  |  |
Foreign equity securities |  |  |  |
Investments |  |  |  |
Amortized Cost |  | 266 | 198 |
Fair Value |  | 319 | 199 |
Foreign equity securities | Denominated in foreign currencies |  |  |  |
Investments |  |  |  |
Fair Value |  | 114 | 91 |
Foreign equity securities | Denominated in Euros |  |  |  |
Investments |  |  |  |
Fair Value |  | 48 | 35 |
Foreign equity securities | Denominated in Japanese Yen |  |  |  |
Investments |  |  |  |
Fair Value |  | 25 | 20 |
Foreign equity securities | Denominated in British pounds |  |  |  |
Investments |  |  |  |
Fair Value |  | 20 | 16 |
Foreign equity securities | Denominated in Swiss Franc |  |  |  |
Investments |  |  |  |
Fair Value |  | 6 | 6 |
Foreign equity securities | Denominated in other foreign currencies |  |  |  |
Investments |  |  |  |
Fair Value |  | 15 | 14 |
Collateralized loan obligation |  |  |  |
Investments |  |  |  |
Amortized Cost |  | 29 | 25 |
Fair Value |  | 29 | 26 |
High yield securities |  |  |  |
Investments |  |  |  |
Amortized Cost |  | 20 | 114 |
Fair Value |  | 21 | 115 |
Money market funds held in trading accounts |  |  |  |
Investments |  |  |  |
Amortized Cost |  | 10 | 13 |
Fair Value |  | 10 | 13 |
Other trading securities |  |  |  |
Investments |  |  |  |
Amortized Cost |  | 5 | 5 |
Fair Value |  | $ 6 | 5 |
Morocco | Grain trading and poultry business |  |  |  |
Investments |  |  |  |
Percentage of ownership interest accounted for as equity method investment |  | 19.40% |  |
Amount invested under cost method |  | $ 18 |  |
Other non-current assets |  |  |  |
Investments |  |  |  |
Cost method investments |  | $ 6 | $ 28 |

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