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INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2018
Intangible Assets [Abstract]  
Disclosure of detailed information about intangible assets
Intangible assets are allocated to the following cash generating units:
US$ MILLIONS
 
2018
 
2017
Brazilian regulated gas transmission operation
 
$
4,211

 
$
5,134

Australian regulated terminal
 
1,766

 
1,957

North American residential energy infrastructure operation
 
1,763

 
—

Peruvian toll roads
 
1,118

 
1,144

Chilean toll roads
 
928

 
1,100

Indian toll roads(1)
 
843

 
130

U.K. port operation
 
273

 
289

Other(2)
 
733

 
140

Total
 
$
11,635

 
$
9,894
Disclosure of reconciliation of changes in intangible assets and goodwill
The following table presents the change in the cost balance of intangible assets:
US$ MILLIONS
 
2018
 
2017
Cost at beginning of the year
 
$
10,470

 
$
4,732

Additions, net of disposals
 
117

 
79

Acquisitions through business combinations(1)
 
3,208

 
5,515

Non-cash additions
 
7

 
18

Foreign currency translation
 
(1,287
)
 
126

Cost at end of year
 
$
12,515

 
$
10,470

 
(1)
See Note 6, Acquisition of Businesses for additional information.
The following table presents the accumulated amortization for Brookfield Infrastructure’s intangible assets:
US$ MILLIONS
 
2018

2017
Accumulated amortization at beginning of year
 
$
(576
)
 
$
(267
)
Amortization
 
(371
)
 
(289
)
Foreign currency translation
 
67

 
(20
)
Accumulated amortization at end of year
 
$
(880
)
 
$
(576
)
US$ MILLIONS
 
2018
 
2017
Cost
 
$
12,515

 
$
10,470

Accumulated amortization
 
(880
)
 
(576
)
Net intangible assets
 
$
11,635

 
$
9,894