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Income Taxes - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets $ 1,209 $ 1,295
Unused tax losses for which a deferred tax asset has not been recognised 702 511
Capital tax losses for which no deferred tax asset recognised 102 100
Temporary differences associated with investments in subsidiaries, branches, joint ventures and associates for which a deferred tax liability has not been recognised $ 5,723 $ 5,611
Applicable tax rate 26.75% 26.80%
Provisional tax benefit relating to revaluation of deferred tax balances   $ 53
One-time deemed repatriation charge   46
Withholding taxes on distributions from foreign subsidiaries $ 28 26
Bottom of range    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Applicable tax rate 0.00%  
Top of range    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Applicable tax rate 30.00%  
United States    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Capital losses $ 0 26
United Kingdom    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Capital losses 460 449
Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Capital losses 176 176
Asia    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Benefit related to investments in joint ventures 16 16
Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Accumulated non-capital tax losses 3,245 2,662
Deferred tax assets 600 543
Unused tax losses | United States    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets $ 6 $ 6