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Goodwill and Intangible Assets
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets

Goodwill

The following table presents goodwill activity for the years ended December 31, 2018 and 2017 (in millions):
 
December 31,
2016
 
Goodwill Acquired
 
Adjustments
 
December 31,
2017
 
Goodwill
Acquired
 
Adjustments
 
December 31,
2018
Goodwill
$
4,501

 
10

 
262

 
$
4,773

 
532

 
(145
)
 
$
5,160



The adjustments to goodwill during the years ended December 31, 2018 and 2017 were primarily due to foreign currency translation. There were no impairments to goodwill in 2018 and 2017.

Intangible Assets

The components of identifiable intangible assets are as follows (in millions, except years): 
 
December 31, 2018
 
December 31, 2017
 
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)
Intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customer lists and user base
$
519

 
$
(445
)
 
$
74

 
5
 
$
458

 
$
(430
)
 
$
28

 
5
Marketing-related
584

 
(578
)
 
6

 
5
 
607

 
(587
)
 
20

 
5
Developed technologies
278

 
(269
)
 
9

 
3
 
273

 
(258
)
 
15

 
3
All other
160

 
(157
)
 
3

 
4
 
156

 
(150
)
 
6

 
4
Total
$
1,541

 
$
(1,449
)
 
$
92

 
 
 
$
1,494

 
$
(1,425
)
 
$
69

 
 

  
Amortization expense for intangible assets was $63 million, $64 million and $56 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Expected future intangible asset amortization as of December 31, 2018 is as follows (in millions):
Fiscal year:
 
2019
$
49

2020
34

2021
9

Thereafter
—

Total
$
92