Intangible Assets (Tables)

9 Months Ended

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