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INTANGIBLE ASSETS
 6 Months Ended
Jun. 30, 2018
Intangible Assets [Abstract]  
INTANGIBLE ASSETS
INTANGIBLE ASSETS
 
As of
US$ MILLIONS
June 30, 2018
 
December 31, 2017
Cost
$
9,555

 
$
10,470

Accumulated amortization
(687
)
 
(576
)
Total
$
8,868

 
$
9,894

Intangible assets are allocated to the following cash generating units:
 
As of
US$ MILLIONS
June 30, 2018
 
December 31, 2017
Brazilian regulated gas transmission operation
$
4,314

 
$
5,134

Australian regulated terminal
1,852

 
1,957

Peruvian toll roads
1,137

 
1,144

Chilean toll roads
1,010

 
1,100

U.K. port operation
283

 
289

Indian toll roads
114

 
130

Other(1)
158

 
140

Total
$
8,868

 
$
9,894

1.
Other intangibles are comprised of customer contracts at our Australian ports operations and contracted order book at our U.K. regulated distribution operation.
The following table presents the change in the cost balance of intangible assets:
 
For the six-month
period ended June 30
US$ MILLIONS
2018

 
2017

Cost at beginning of the period
$
10,470

 
$
4,732

Additions through business combinations
17

 
5,539

Additions, net of disposals
32

 
46

Foreign currency translation
(964
)
 
(25
)
Ending Balance
$
9,555

 
$
10,292


The following table presents the accumulated amortization for Brookfield Infrastructure’s intangible assets:
 
For the six-month
period ended June 30
US$ MILLIONS
2018

 
2017

Accumulated amortization at beginning of the period
$
(576
)
 
$
(267
)
Disposals
—

 
1

Amortization
(173
)
 
(143
)
Foreign currency translation
62

 
(9
)
Ending Balance
$
(687
)
 
$
(418
)