Intangible Assets

6 Months Ended

Jun. 30, 2013

Intangible Assets

7. Intangible Assets

Intangible assets consisted of the following:

(In millions)	Gross Carrying Amount		Accumulated Amortization		Net Book Value
June 30, 2013
Customer related intangible assets	$	2,155	$	600	$	1,555
Acquired software and technology		483		255		228
Trade names		120		33		87
Capitalized software development costs		653		393		260
Purchased software		308		229		79
Total	$	3,719	$	1,510	$	2,209
(In millions)	Gross Carrying Amount		Accumulated Amortization		Net Book Value
December 31, 2012
Customer related intangible assets	$	1,695	$	534	$	1,161
Acquired software and technology		378		222		156
Trade names		114		29		85
Capitalized software development costs		667		398		269
Purchased software		325		252		73
Total	$	3,179	$	1,435	$	1,744

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 $210 million in 2013, approximately $200 million in 2014, approximately $190 million in 2015, approximately $150 million in 2016 and approximately $140 million in 2017. Annual amortization expense in 2013 with respect to capitalized and purchased software is estimated to approximate $110 million.