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GOODWILL
 12 Months Ended
Dec. 31, 2021
Intangible Assets [Abstract]  
GOODWILL GOODWILL
The following table presents the carrying amount for Brookfield Infrastructure’s goodwill:
US$ MILLIONS20212020
Balance at beginning of the year$6,634 $6,553 
Acquisitions through business combinations(1)
2,400 27 
Assets held by subsidiaries disposed during the period(2)
(56)— 
Foreign currency translation and other1 54 
Balance at end of the year$8,979 $6,634 
(1)See Note 6, Acquisition of Businesses, for additional information.
(2)See Note 5, Disposition of Businesses, for additional information.
Goodwill is evaluated for impairment annually or more often if events or circumstances indicate there may be impairment. Impairment is determined by assessing if the carrying value of cash generating units or a group of cash generating units, including the allocated goodwill, exceeds its recoverable amount determined as the greater of the estimated fair value less costs of disposal or the value in use. During 2021, the carrying amount of each cash generating unit was determined to not exceed its recoverable amount.
Goodwill is allocated to the following cash generating units or group of cash generating units:
US$ MILLIONS20212020
Canadian diversified midstream operation(1)
$2,125 $— 
North American rail operations2,105 2,126 
North American residential energy infrastructure operation1,356 1,296 
Western Canadian natural gas gathering and processing operation762 756 
U.S. data center operation503 487 
Brazilian regulated transmission operation456 490 
Colombian natural gas distribution operation433 520 
U.K. telecom tower operation341 345 
Other898 614 
Total$8,979 $6,634 
(1)See Note 6, Acquisition of Businesses, for additional information.
The recoverable amount of the goodwill has been determined using a discounted cash flow model whereby the fair value measurement is classified under level 3 on the fair value hierarchy. For businesses with the most significant goodwill as separately listed in the table above, the key inputs in determining the fair value of each cash generating unit under the discounted cash flow model are the utilization of discount rates ranging from 11% to 14%, terminal value multiples of 6x to 20x and discrete cash flow periods from 6 to 20 years.