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Employee Benefit Plans (Changes in Benefit Obligation and Plan Assets and the Funded Status) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined benefit pension plans    
Change in Projected Benefit Obligation ("PBO") and Accumulated Post-retirement Benefit Obligation ("APBO")    
Benefit Obligation, Beginning Balance $ 2,822 $ 2,650
Service cost 46 47
Plan participant contributions 7 8
Interest cost 84 102
Benefits Paid (135) (130)
Actuarial (gains) losses 189 231
Settlement, curtailments (229) (20)
Foreign currency translation adjustment (25) (66)
Benefit Obligation, Ending Balance 2,759 2,822
Change in plan assets    
Plan Assets, Beginning Balance 2,593 2,300
Employer contributions 41 52
Plan participant contributions 7 8
Benefits paid (135) (130)
Actual return on assets, net of expenses 310 424
Settlements and curtailments (191) (7)
Foreign currency translation adjustment (20) (54)
Plan Assets, Ending Balance 2,605 2,593
Funded Status    
Funded status, end of year (154) (229)
Non-pension Benefit Plans    
Change in Projected Benefit Obligation ("PBO") and Accumulated Post-retirement Benefit Obligation ("APBO")    
Benefit Obligation, Beginning Balance 353 350
Service cost 5 4
Plan participant contributions 5 5
Interest cost 10 14
Benefits Paid (27) (23)
Actuarial (gains) losses 52 19
Settlement, curtailments (52) 0
Foreign currency translation adjustment (7) (16)
Benefit Obligation, Ending Balance 339 353
Change in plan assets    
Plan Assets, Beginning Balance 56 49
Employer contributions 21 19
Plan participant contributions 5 5
Benefits paid (27) (23)
Actual return on assets, net of expenses 5 7
Settlements and curtailments (7) 0
Foreign currency translation adjustment (1) (1)
Plan Assets, Ending Balance 52 56
Funded Status    
Funded status, end of year $ (287) $ (297)