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Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets

Goodwill

The following table presents goodwill balances and adjustments to those balances for the years ended December 31, 2015 and 2014:
 
December 31,
2013
 
Goodwill Acquired
 
Adjustments
 
December 31,
2014
 
Goodwill
Acquired
 
Adjustments
 
December 31,
2015
 
(In millions)
Goodwill
$
4,855

 
30

 
(214
)
 
$
4,671

 
23

 
(243
)
 
$
4,451



The adjustments to goodwill during the year ended December 31, 2015 and December 31, 2014 were due primarily to foreign currency translation.
We conducted our annual impairment test of goodwill as of August 31, 2015. As of December 31, 2015, we determined that no impairment of the carrying value of goodwill for any reporting units was required.

Intangible Assets

The components of identifiable intangible assets are as follows: 
 
December 31, 2015
 
December 31, 2014
 
Gross Carrying Amount  
 
Accumulated Amortization 
 
Net Carrying Amount
 
Weighted Average Useful Life (Years)
 
Gross Carrying Amount 
 
Accumulated Amortization 
 
Net Carrying Amount
 
Weighted Average Useful Life (Years)
 
(In millions, except years)
Intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customer lists and user base
$
419

 
$
(399
)
 
$
20

 
5
 
$
434

 
$
(407
)
 
$
27

 
5
Marketing related
594

 
(570
)
 
24

 
5
 
642

 
(596
)
 
46

 
5
Developed technologies
238

 
(215
)
 
23

 
4
 
237

 
(195
)
 
42

 
4
All other
157

 
(134
)
 
23

 
4
 
144

 
(126
)
 
18

 
4
 
$
1,408

 
$
(1,318
)
 
$
90

 
 
 
$
1,457

 
$
(1,324
)
 
$
133

 
 

  
Amortization expense for intangible assets was $66 million, $120 million and $175 million for the years ended December 31, 2015, 2014 and 2013, respectively.

Expected future intangible asset amortization as of December 31, 2015 is as follows (in millions):
Fiscal years:
 
2016
$
47

 
2017
33

 
2018
10

 
2019

 
2020

 
Thereafter

 
 
$
90