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Financial Instrument Risk Management - Credit Default Swaps by Underlying Financial Instrument Credit Rating (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of external credit grades [line items]      
Notional amount $ 162,948 $ 157,035 $ 174,499
Fair value 162,854 156,900  
Credit default swap contract      
Disclosure of external credit grades [line items]      
Notional amount 1,031 1,360  
Fair value 20 16  
Total single name credit default swap contracts | Credit default swap contract      
Disclosure of external credit grades [line items]      
Notional amount 1,031 1,360  
Fair value 20 16  
Total single name credit default swap contracts | AA | Credit default swap contract      
Disclosure of external credit grades [line items]      
Notional amount 0 20  
Fair value 0 0  
Total single name credit default swap contracts | A | Credit default swap contract      
Disclosure of external credit grades [line items]      
Notional amount 491 587  
Fair value 5 4  
Total single name credit default swap contracts | BB | Credit default swap contract      
Disclosure of external credit grades [line items]      
Notional amount 540 706  
Fair value 15 5  
Total single name credit default swap contracts | BBB | Credit default swap contract      
Disclosure of external credit grades [line items]      
Notional amount 0 47  
Fair value $ 0 $ 7