Intangible Assets

9 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible Assets

Intangible assets consisted of the following:

(In millions)	Gross Carrying Amount		Accumulated Amortization		Net Book Value
September 30, 2015
Customer related intangible assets	$	2,153	$	889	$	1,264
Acquired software and technology	493		405		88
Trade names	120		51		69
Capitalized software development costs	567		198		369
Purchased software	272		156		116
Total	$	3,605	$	1,699	$	1,906

(In millions)	Gross Carrying Amount		Accumulated Amortization		Net Book Value
December 31, 2014
Customer related intangible assets	$	2,155	$	797	$	1,358
Acquired software and technology	493		356		137
Trade names	120		46		74
Capitalized software development costs	574		240		334
Purchased software	234		134		100
Total	$	3,576	$	1,573	$	2,003

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 2015, $150 million in 2016, $140 million in each of 2017 and 2018, and $130 million in 2019. Annual amortization expense in 2015 with respect to capitalized and purchased software is estimated to approximate $115 million.