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Employee Future Benefits - Contributions (Details)
CAD in Millions
12 Months Ended
Dec. 31, 2017
CAD
Disclosure of defined benefit plans [line items]  
Expected employer contributions CAD 12
Registered  
Disclosure of defined benefit plans [line items]  
Expected employer contributions 4
Supplemental  
Disclosure of defined benefit plans [line items]  
Expected employer contributions 6
Other  
Disclosure of defined benefit plans [line items]  
Expected employer contributions CAD 2