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Financial assets and liabilities - Interest Rate Exposures (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
CAD ($)
Jun. 30, 2021
CAD ($)
Jun. 30, 2022
CAD ($)
Jun. 30, 2021
CAD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
CAD ($)
Disclosure of detailed information about hedging instruments [line items]            
Net gains (losses) on change in fair value of derivatives $ (81,000,000) $ 100,000,000 $ (6,000,000) $ 160,000,000    
Interest rate risk            
Disclosure of detailed information about hedging instruments [line items]            
Net gains (losses) on change in fair value of derivatives $ 1,000,000   $ 2,000,000      
Percentage of possible change in risk variable 1.00%   1.00%   1.00%  
Interest rate risk | Top of range            
Disclosure of detailed information about hedging instruments [line items]            
Reasonably possible change in risk variable impact on net earnings $ 28,000,000   $ 28,000,000      
Interest rate risk | Bottom of range            
Disclosure of detailed information about hedging instruments [line items]            
Reasonably possible change in risk variable impact on net earnings 40,000,000   40,000,000      
Interest rate swaptions | Interest rate risk            
Disclosure of detailed information about hedging instruments [line items]            
Principal amount 750,000,000   750,000,000      
Proceeds from sale of financial assets 6,000,000          
Financial liabilities, at fair value 9,000,000   9,000,000      
Interest rate swap | Interest rate risk            
Disclosure of detailed information about hedging instruments [line items]            
Principal amount $ 540,000,000   $ 540,000,000      
Financial liabilities, at fair value         $ 8,000,000  
Currency basis rate swap contract | Interest rate risk            
Disclosure of detailed information about hedging instruments [line items]            
Percentage of possible change in risk variable 0.10%   0.10%   0.10%  
Reasonably possible change in risk variable impact on net earnings $ 7,000,000   $ 7,000,000      
Dividend rate reset of preference shares | Interest rate options | Interest rate risk            
Disclosure of detailed information about hedging instruments [line items]            
Financial instruments designated as hedging instruments, at fair value 0   0     $ 2,000,000
Preferred shares            
Disclosure of detailed information about hedging instruments [line items]            
Value of shares $ 3,885,000,000   $ 3,885,000,000     4,003,000,000
Preferred shares | Interest rate risk            
Disclosure of detailed information about hedging instruments [line items]            
Value of shares           $ 582,000,000