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Cash Flow Information Changes in Liabilities from Financing Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance at beginning of the period $ 3,741 $ 4,415
Net cash flows (626) (631)
New leases 10 14
Dividends declared 107 64
Foreign exchange impact 95 (115)
Other (2) (6)
Balance at end of the period 3,325 3,741
Long-term debt and finance lease obligations    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance at beginning of the period 3,707 4,361
Net cash flows (540) (545)
New leases 10 14
Dividends declared 0 0
Foreign exchange impact 95 (115)
Other (5) (8)
Balance at end of the period 3,267 3,707
Dividends payable (common and preferred)    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance at beginning of the period 34 54
Net cash flows (86) (86)
New leases 0 0
Dividends declared 107 64
Foreign exchange impact 0 0
Other 3 2
Balance at end of the period $ 58 $ 34