Intangible Assets (Tables)

6 Months Ended

Jun. 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 June 30, 2013 and December 31, 2012.

	At June 30, 2013						At December 31, 2012
	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net
	(in millions)
Directory services agreements	$	1,475	$	480	$	995	$	1,330	$	363	$	967
Client relationships	1,155		315		840		735		217		518
Trademarks and domain names	440		114		326		380		84		296
Patented technologies	85		35		50		75		30		45
Advertising commitment	11		5		6		11		4		7
Total intangible assets	$	3,166	$	949	$	2,217	$	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