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Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2013
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 September 30, 2013 and December 31, 2012.
| At September 30, 2013 | At December 31, 2012
| Gross | Accumulated Amortization | Net | Gross | Accumulated Amortization | Net
| (in millions)
Directory services agreements | $ | 1,475 |  | $ | 579 |  | $ | 896 |  | $ | 1,330 |  | $ | 363 |  | $ | 967 |
Client relationships | 1,155 |  | 413 |  | 742 |  | 735 |  | 217 |  | 518 |
Trademarks and domain names | 440 |  | 140 |  | 300 |  | 380 |  | 84 |  | 296 |
Patented technologies | 85 |  | 37 |  | 48 |  | 75 |  | 30 |  | 45 |
Advertising commitment | 11 |  | 6 |  | 5 |  | 11 |  | 4 |  | 7 |
Total intangible assets | $ | 3,166 |  | $ | 1,175 |  | $ | 1,991 |  | $ | 2,531 |  | $ | 698 |  | $ | 1,833 |
Schedule of Finite Lived Intangible Assets Useful Lives | The changes to the estimated remaining useful lives are reflected in the following table:
| Estimated Remaining Useful Lives
| Previous | Revised
Directory services agreements | 9 years | 5 years
Client relationships | 8 years | 4 years
Trademarks and domain names | 8 years | 6 years
Patented technologies | 5 years | 5 years
Advertising commitment | 5 years | 3 years

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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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