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Employee Benefit Plans (Amounts Recognized in the Consolidated Balance Sheets ) (Details) - CAD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]    
Current Liabilities $ (41) $ (58)
Liabilities, Noncurrent (559) (669)
Pension Plan [Member]    
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]    
Current Liabilities (23) (41)
Liabilities, Noncurrent (264) (367)
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent 10 9
Deferred Tax Assets, Defined Benefit Plan (15) (16)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax 548 620
Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total 286 237
Non-pension Benefit Plans [Member    
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]    
Current Liabilities (18) (17)
Liabilities, Noncurrent (295) (302)
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent 0 0
Deferred Tax Assets, Defined Benefit Plan (1) 1
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax 73 45
Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total $ (239) $ (275)