Intangible Assets

6 Months Ended

Jun. 30, 2014

Intangible Assets

8. Intangible Assets

Intangible assets consisted of the following:

(In millions)	Gross Carrying Amount		Accumulated Amortization		Net Book Value
June 30, 2014
Customer related intangible assets	$	2,155	$	733	$	1,422
Acquired software and technology		493		322		171
Trade names		120		43		77
Capitalized software development costs		619		302		317
Purchased software		238		155		83
Total	$	3,625	$	1,555	$	2,070
(In millions)	Gross Carrying Amount		Accumulated Amortization		Net Book Value
December 31, 2013
Customer related intangible assets	$	2,155	$	667	$	1,488
Acquired software and technology		493		289		204
Trade names		120		39		81
Capitalized software development costs		635		348		287
Purchased software		277		195		82
Total	$	3,680	$	1,538	$	2,142

The Company estimates that annual amortization expense with respect to acquired intangible assets, which include customer related intangible assets, acquired software and technology, and trade names, will be approximately $200 million in 2014, $190 million in 2015, $150 million in 2016 and $140 million in each of 2017 and 2018. Annual amortization expense in 2014 with respect to capitalized and purchased software is estimated to approximate $110 million.