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Asset and Goodwill Impairment Testing (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Pre-tax Impairment Reversal and (Asset Impairments) Recorded in Statement of Income

The following pre-tax impairment reversal and (asset impairments) were recorded in the statement of income:

Impairment Reversal and (Asset Impairments)

 

(CAD$ in millions)

    2018      2017  

Steelmaking coal CGU

    $ —        $ 207  

Other

      (41 )       (44 ) 
  

 

 

     

 

 

  

Total

    $ (41 )     $ 163  
  

 

 

     

 

 

  

Summary of Key Assumptions Used in Our Asset Impairment Reversal and Goodwill Impairment Analyses

The following are the key assumptions used in our impairment testing calculations during the years ended December 31, 2018 and 2017:

 

    

2018

   

2017
Steelmaking coal prices    Current price used in initial year, decreased to a long-term price in 2023 of US$150 per tonne    Current price used in initial year, decreased to a long-term price in 2022 of US$140 per tonne
Copper prices    Current price used in initial year, increased to a long-term price in 2023 of US$3.00 per pound    Current price used in initial year, decreased to a long-term price in 2022 of US$3.00 per pound
Discount rate    6.0%    5.9%
Long-term foreign exchange rate    1 U.S. to 1.25 Canadian dollars    1 U.S. to 1.25 Canadian dollars
Inflation rate    2%    2%