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Employee Future Benefits - Status of Plans (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) $ (238) $ (247)  
Accrued current liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (11) (12)  
Other long-term liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (227) (235)  
Fair value of plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) 381 428 $ 433
Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (619) (675) (663)
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (146) (145)  
Registered | Accrued current liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (5) (4)  
Registered | Other long-term liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (141) (141)  
Registered | Fair value of plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) 368 416 423
Registered | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (514) (561) (554)
Supplemental      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (67) (75)  
Supplemental | Accrued current liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (5) (6)  
Supplemental | Other long-term liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (62) (69)  
Supplemental | Fair value of plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) 13 12 10
Supplemental | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (80) (87) (82)
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (25) (27)  
Other | Accrued current liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (1) (2)  
Other | Other long-term liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (24) (25)  
Other | Fair value of plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) 0 0 0
Other | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) $ (25) $ (27) $ (27)