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Goodwill
12 Months Ended
Dec. 31, 2020
Intangible Assets [Abstract]  
Goodwill Goodwill
(CAD$ in millions)Steelmaking
Coal Operations
Quebrada
Blanca
Total
January 1, 2019$702 $419 $1,121 
Changes in foreign exchange rates— (20)(20)
December 31, 2019$702 $399 $1,101 
Changes in foreign exchange rates— (8)(8)
December 31, 2020$702 $391 $1,093 

The results of our annual goodwill impairment analysis and key assumptions used in the analysis are outlined in Notes 8(b) and 8(c).