Intangible Assets

3 Months Ended

Mar. 31, 2014

Intangible Assets, Net (Excluding Goodwill) [Abstract]

The following table sets forth the details of the Company's intangible assets at March 31, 2014 and December 31, 2013.



	At March 31, 2014						At December 31, 2013
	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net
	(in millions)
Directory services agreements	$	666	$	150	$	516	$	666	$	97	$	569
Client relationships	924		423		501		924		348		576
Trademarks and domain names	222		44		178		222		29		193
Patented technologies	42		7		35		42		4		38
Advertising commitment	11		7		4		11		6		5
Total intangible assets	$	1,865	$	631	$	1,234	$	1,865	$	484	$	1,381

Amortization expense for intangible assets was $147 million and $75 million for the three months ended March 31, 2014 and 2013, respectively. There was no amortization expense associated with intangible assets related to SuperMedia included in our operating results for the three months ended March 31, 2013, as the merger was effective April 30, 2013. Additionally, amortization expense related to intangibles assets increased, due to adjustments to the estimated remaining useful lives during 2013, partially offset by the impacts of intangible assets impairment charges in 2013.

The annual amortization expense for intangible assets is estimated to be $587 million in 2014, $373 million in 2015, $237 million in 2016, $103 million in 2017 and $81 million in 2018.