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Intangible Assets (Tables)
6 Months Ended
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