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GOODWILL (Tables)
 12 Months Ended
Dec. 31, 2017
Intangible Assets [Abstract]  
Disclosure of reconciliation of changes in intangible assets and goodwill
The following table presents the accumulated amortization for Brookfield Infrastructure’s intangible assets:
US$ MILLIONS
 
2017
 
2016
Accumulated amortization at beginning of year
 
$
(267
)
 
$
(189
)
Amortization
 
(289
)
 
(93
)
Foreign currency translation
 
(20
)
 
15

Accumulated amortization at end of year
 
$
(576
)
 
$
(267
)
The following table presents the change in the cost balance of intangible assets:
US$ MILLIONS
 
2017
 
2016
Cost at beginning of the year
 
$
4,732

 
$
3,485

Additions, net of disposals
 
79

 
116

Acquisitions through business combinations(1)
 
5,515

 
1,189

Non-cash additions
 
18

 
—

Foreign currency translation
 
126

 
(58
)
Cost at end of year
 
$
10,470

 
$
4,732

 
(1)
See Note 5, Acquisition of Business for additional information.
The following table presents the carrying amount for Brookfield Infrastructure’s goodwill:
US$ MILLIONS
 
2017
 
2016
Balance at beginning of the year
 
$
502

 
$
79

Acquisitions through business combinations(1)
 
815

 
431

Foreign currency translation and other
 
(16
)
 
(8
)
Balance at end of the year
 
$
1,301

 
$
502

 
(1)
See Note 5, Acquisition of Business for additional information.