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INTANGIBLE ASSETS AND GOODWILL
12 Months Ended
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets and Goodwill
INTANGIBLE ASSETS AND GOODWILL
The following table details the composition of our acquired intangible assets at year-end 2014 and 2013:  
($ in millions)
At Year-End 2014
 
At Year-End 2013
Definite-lived Intangible Assets
 
 
 
Contract acquisition costs and other
$
1,735

 
$
1,550

Accumulated amortization
(461
)
 
(423
)
 
$
1,274

 
$
1,127

Indefinite-lived Intangible Assets
 
 
 
Brands
77

 
4

Total Intangible Assets
$
1,351

 
$
1,131

 
 
 
 

We capitalize both direct and incremental costs that we incur to acquire management, franchise, and license agreements. We amortize these costs on a straight-line basis over the initial term of the agreements, ranging from 15 to 30 years. Our amortization expense totaled $64 million in 2014, $68 million in 2013, and $54 million in 2012. We estimate that our aggregate amortization expense for each of the next five fiscal years will be as follows: $58 million for 2015; $58 million for 2016; $58 million for 2017; $58 million for 2018; and $58 million for 2019.
The following table details the carrying amount of our goodwill at year-end 2014 and 2013:
($ in millions)
At Year-End 2014
 
At Year-End 2013
Goodwill
$
948

 
$
928

Accumulated impairment losses
(54
)
 
(54
)
 
$
894

 
$
874