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Goodwill and Intangible Assets (Notes)
3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets

During the three months ended March 31, 2018, we completed business acquisitions that were not material to our condensed consolidated financial statements, either individually or in the aggregate. Accordingly, pro forma historical results of operations related to these business acquisitions during the three months ended March 31, 2018 have not been presented. We have included the financial results of these business acquisitions in our condensed consolidated financial statements from their respective dates of acquisition.
The changes in the carrying amount of goodwill for the three months ended March 31, 2018 are as follows (in millions): 
Balance as of December 31, 2017
$
18,221

Goodwill acquired
47

Balance as of March 31, 2018
$
18,268

Intangible assets consist of the following (in millions):
 
 
 
March 31, 2018
 
December 31, 2017
 
Weighted-Average Remaining Useful Lives (in years)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Acquired users
3.5
 
$
2,056

 
$
(1,043
)
 
$
1,013

 
$
2,056

 
$
(971
)
 
$
1,085

Acquired technology
1.7
 
992

 
(759
)
 
233

 
972

 
(711
)
 
261

Acquired patents
5.6
 
785

 
(516
)
 
269

 
785

 
(499
)
 
286

Trade names
2.0
 
629

 
(433
)
 
196

 
629

 
(406
)
 
223

Other
2.5
 
162

 
(138
)
 
24

 
162

 
(133
)
 
29

Total intangible assets
3.4
 
$
4,624

 
$
(2,889
)
 
$
1,735

 
$
4,604

 
$
(2,720
)
 
$
1,884


Amortization expense of intangible assets was $169 million and $175 million for the three months ended March 31, 2018 and 2017, respectively.
As of March 31, 2018, expected amortization expense for the unamortized acquired intangible assets for the next five years and thereafter is as follows (in millions):
The remainder of 2018
$
471

2019
546

2020
371

2021
266

2022
29

Thereafter
52

Total
$
1,735