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Intangible Assets
 12 Months Ended
Dec. 31, 2016
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]  
Intangible Assets
Intangible Assets

Customer relationships intangible assets are obtained as part of acquired businesses and are amortized over their estimated useful lives, generally five to 10 years, using accelerated methods. Trademarks determined to have indefinite lives are not amortized. Certain other trademarks are amortized over periods ranging up to 15 years. As of December 31, 2016 and 2015, trademarks carried at $80 million and $81 million, respectively, were classified as indefinite-lived.

Intangible assets as of December 31, 2016 consist of the following (in millions):
 
Cost
 
Accumulated
Amortization
 
Net
Customer relationships
$
6,367

 
$
(1,840
)
 
$
4,527

Trademarks
180

 
(43
)
 
137

 
$
6,547

 
$
(1,883
)
 
$
4,664


Intangible assets as of December 31, 2015 consist of the following (in millions):

 
Cost
 
Accumulated
Amortization
 
Net
Customer relationships
$
6,782

 
$
(1,782
)
 
$
5,000

Trademarks
181

 
(22
)
 
159

 
$
6,963

 
$
(1,804
)
 
$
5,159



Amortization expense for intangible assets with finite lives was $507 million, $231 million and $215 million for the years ended December 31, 2016, 2015 and 2014, respectively.

Estimated amortization of intangibles, including the contract intangible in our Brazilian Venture, which is amortized as a reduction in revenue, for the next five years is as follows (in millions):
2017
$
681

2018
678

2019
667

2020
489

2021
453