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Pension and other Post-Retirement Benefits - Investment Objectives (Details) - Defined benefits pension plans - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension and other PostRetirement Benefits,      
Employer contributions   $ 182 $ 160
Contribution deposited in solvency reserve account   $ 2 $ 3
Expected cash contributions $ 172    
Equities      
Pension and other PostRetirement Benefits,      
Plan asset allocation percentage   48.00% 56.00%
Equities | Canada      
Pension and other PostRetirement Benefits,      
Plan asset allocation percentage   13.00% 18.00%
Equities | United States      
Pension and other PostRetirement Benefits,      
Plan asset allocation percentage   17.00% 19.00%
Equities | Foreign      
Pension and other PostRetirement Benefits,      
Plan asset allocation percentage   18.00% 19.00%
Fixed income | Canada      
Pension and other PostRetirement Benefits,      
Plan asset allocation percentage   43.00% 39.00%
Real estate      
Pension and other PostRetirement Benefits,      
Plan asset allocation percentage   100.00% 100.00%
Real estate | Canada      
Pension and other PostRetirement Benefits,      
Plan asset allocation percentage   9.00% 5.00%