Intangible Assets

3 Months Ended

Mar. 31, 2016

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
March 31, 2016
Customer related intangible assets	$	2,197	$	951	$	1,246
Acquired software and technology	508		415		93
Trade names	117		52		65
Capitalized software development costs	590		207		383
Purchased software	208		86		122
Total	$	3,620	$	1,711	$	1,909

(In millions)	Gross Carrying Amount		Accumulated Amortization		Net Book Value
December 31, 2015
Customer related intangible assets	$	2,155	$	922	$	1,233
Acquired software and technology	488		413		75
Trade names	120		53		67
Capitalized software development costs	575		199		376
Purchased software	256		135		121
Total	$	3,594	$	1,722	$	1,872

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 $160 million in 2016, $150 million in 2017, $140 million in each of 2018 and 2019 and $120 million in 2020. Annual amortization expense in 2016 with respect to capitalized and purchased software is estimated to approximate $130 million.