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Investments (Tables) | 12 Months Ended
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Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments | The following table presents the details of our investments:
| December 31,
| 2016 |  | 2015
| (in millions)
Trading securities | $ | 228 |  |  | $ | 189 |
Available-for-sale investment securities | 17 |  |  | 12 |
Equity method investments | 124 |  |  | 72 |
Cost method investments | 144 |  |  | 132 |

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