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Other Intangible Assets
 12 Months Ended
Dec. 31, 2018
Intangible Assets, Gross (Excluding Goodwill) [Abstract]  
Other Intangible Assets
Other Intangible Assets
Other intangible assets are presented in the following table.
December 31
 
 
2018
 
2017
(In millions)
Economic Useful Life
 
Carrying Amount
 
Accumulated Amortization
 
Carrying Amount
 
Accumulated Amortization
Finite-lived intangible assets:
 
 
 
 
 
 
 
 
 
Trade name
8 years
 
$
6

 
$
5

 
$
7

 
$
5

Distribution channel
15 years
 
10

 
4

 
11

 
4

Total finite-lived intangible assets
 
 
16

 
9

 
18

 
9

Indefinite-lived intangible assets:
 
 
 
 
 
 
 
 
 
Syndicate capacity
 
 
45

 
 
 
47

 
 
Agency force
 
 
16

 
 
 
16

 
 
Total indefinite-lived intangible assets
 
 
61

 
 
 
63

 
 
Total other intangible assets
 
 
$
77

 
$
9

 
$
81

 
$
9


The Company's other intangible assets primarily relate to the purchase of Hardy, and the amortization of the finite-lived intangible assets is included in the Statement of Operations for the International segment. For the years ended December 31, 2018, 2017 and 2016 amortization expense of $1 million, $2 million and $1 million was included in Other operating expenses. The gross carrying amounts and accumulated amortization in the table above may change from period to period as a result of foreign currency translation. Estimated future annual amortization expense for other intangible assets is $1 million in years 2019 through 2023.