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INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2020
Intangible Assets [Abstract]  
Disclosure of reconciliation of changes in intangible assets and goodwill
As of
US$ MILLIONSDec. 31, 2020Dec. 31, 2019
Cost$3,527 $4,479 
Accumulated amortization(579)(543)
Total$2,948 $3,936 
The following table presents the change in the cost balance of intangible assets:
For the year ended
US$ MILLIONSDec. 31, 2020Dec. 31, 2019
Cost at beginning of the year$4,479 $4,631 
Additions, net of disposals35 21 
Foreign currency translation(987)(173)
Cost at end of year$3,527 $4,479 

The following table presents the accumulated amortization for our company’s intangible assets:
For the year ended
US$ MILLIONSDec. 31, 2020Dec. 31, 2019
Accumulated amortization at beginning of year$(543)$(364)
Amortization(152)(195)
Foreign currency translation116 16 
Accumulated amortization at end of year$(579)$(543)
Disclosure of detailed information about intangible assets
Intangible assets are allocated to the following cash generating units:
As of
US$ MILLIONSDec. 31, 2020Dec. 31, 2019
Brazilian regulated gas transmission operation$2,903 $3,885 
U.K. regulated distribution operation45 51 
Total$2,948 $3,936