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Intangible Assets | 6 Months Ended
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Jun. 30, 2014
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets | Intangible Assets The following table sets forth the details of the Company's intangible assets at June 30, 2014 and December 31, 2013.
| At June 30, 2014 | At December 31, 2013
| Gross | Accumulated Amortization | Net | Gross | Accumulated Amortization | Net
| (in millions)
Directory services agreements | $ | 666 |  | $ | 202 |  | $ | 464 |  | $ | 666 |  | $ | 97 |  | $ | 569 |
Client relationships | 924 |  | 498 |  | 426 |  | 924 |  | 348 |  | 576 |
Trademarks and domain names | 222 |  | 60 |  | 162 |  | 222 |  | 29 |  | 193 |
Patented technologies | 42 |  | 10 |  | 32 |  | 42 |  | 4 |  | 38 |
Advertising commitment | 11 |  | 7 |  | 4 |  | 11 |  | 6 |  | 5 |
Total intangible assets | $ | 1,865 |  | $ | 777 |  | $ | 1,088 |  | $ | 1,865 |  | $ | 484 |  | $ | 1,381 |
Amortization expense for intangible assets was $146 million and $293 million for the three and six months ended June 30, 2014 compared to $176 million and $251 million for the three and six months ended June 30, 2013, respectively. There was no amortization expense associated with intangible assets related to SuperMedia included in our operating results for the four months ended April 30, 2013, as the merger was effective April 30, 2013. Additionally, amortization expense related to intangibles assets increased, due to adjustments to the estimated remaining useful lives during 2013, partially offset by the impacts of intangible assets impairment charges in 2013. The annual amortization expense for intangible assets is estimated to be $587 million in 2014, $373 million in 2015, $237 million in 2016, $103 million in 2017 and $81 million in 2018.

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