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GOODWILL
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL GOODWILL
Liquids
Pipelines
Gas
Transmission and Midstream
Gas
Distribution and Storage
Energy
Services
Consolidated
(millions of Canadian dollars)
Balance at January 1, 20198,324 20,777 5,356 34,459 
Foreign exchange and other(373)(933)— — (1,306)
Balance at December 31, 20191,2
7,951 19,844 5,356 33,153 
Foreign exchange and other(123)(364)  (487)
Acquisition  22  22 
Balance at December 31, 20201,2
7,828 19,480 5,378 2 32,688 
1 Gross cost of goodwill as at December 31, 2020 and 2019 was $34.3 billion and $34.7 billion, respectively.
2 Accumulated impairment as at December 31, 2020 and 2019 was $1.6 billion .