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Income Taxes - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets   $ 1,634 $ 1,455
Unused tax losses for which a deferred tax asset has not been recognised   587 553
Capital tax losses for which no deferred tax asset recognised   110 101
Temporary differences associated with investments in subsidiaries, branches, joint ventures and associates for which a deferred tax liability has not been recognised   $ 5,299 $ 5,489
Tax rate and other legislative changes   0.00% 0.10%
Applicable tax rate   26.50% 26.50%
Changes in tax rates or tax laws enacted or announced [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Statutory tax rate, net of Alberta tax rate reduction 26.25%    
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   $ 19 $ 1
United Kingdom      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Capital losses   460 455
Canada      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Capital losses   169 178
Unused tax losses      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Accumulated non-capital tax losses   3,382 3,317
Unused tax losses | United States      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets   $ 4 $ 1