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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Summary of Marketable Securities |
| 2014 |  | 2013
| Cost |  | Unrealized Gains (Losses) |  | Fair Value |  | Cost |  | Unrealized Gains (Losses) |  | Fair Value
U.S. government securities | $ | 38 |  |  | $ | — |  |  | $ | 38 |  |  | $ | 27 |  |  | $ | — |  |  | $ | 27 |
Corporate securities | 36 |  |  |  |  |  | 36 |  |  | 30 |  |  | (1 | ) |  | 29 |
Certificates of deposit | 23 |  |  |  |  |  | 23 |  |  | 21 |  |  |  |  | 21 |
Other | 67 |  |  | 5 |  |  | 72 |  |  | 31 |  |  | 2 |  |  | 33 |
Total marketable securities | $ | 164 |  |  | $ | 5 |  |  | $ | 169 |  |  | $ | 109 |  |  | $ | 1 |  |  | $ | 110 |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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