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Income Taxes - Narrative (Details) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax assets     $ 1,455 $ 1,209
Unused tax losses for which a deferred tax asset has not been recognised     553 702
Capital tax losses for which no deferred tax asset recognised     101 102
Temporary differences associated with investments in subsidiaries, branches, joint ventures and associates for which a deferred tax liability has not been recognised     $ 6,068 $ 5,723
Tax rate and other legislative changes     0.10% 0.00%
Applicable tax rate     26.50% 26.75%
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     $ 1 $ 30
United Kingdom        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Capital losses     455 460
Canada        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Capital losses     178 176
Tax rate and other legislative changes 8.00% 12.00%    
Unused tax losses        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Accumulated non-capital tax losses     3,317 3,245
Unused tax losses | United States        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax assets     $ 1 $ 6