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Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2014
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Schedule of Finite-Lived 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 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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