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Financial Instrument Risk Management - Derivative Financial Instruments by Counterparty Credit Rating (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of external credit grades [line items]      
Carrying value $ 162,948 $ 157,035 $ 174,499
Derivative investments      
Disclosure of external credit grades [line items]      
Carrying value 2,183 2,095  
Derivative investments | Over-the-counter derivative contracts | Credit risk | Gross positive replacement cost      
Disclosure of external credit grades [line items]      
Carrying value 2,158 2,057  
Derivative investments | Over-the-counter derivative contracts | Credit risk | Gross positive replacement cost | AA      
Disclosure of external credit grades [line items]      
Carrying value 472 482  
Derivative investments | Over-the-counter derivative contracts | Credit risk | Gross positive replacement cost | A      
Disclosure of external credit grades [line items]      
Carrying value 1,686 1,560  
Derivative investments | Over-the-counter derivative contracts | Credit risk | Gross positive replacement cost | BBB      
Disclosure of external credit grades [line items]      
Carrying value 0 15  
Derivative investments | Over-the-counter derivative contracts | Credit risk | Impact of master netting agreements      
Disclosure of external credit grades [line items]      
Carrying value (739) (1,088)  
Derivative investments | Over-the-counter derivative contracts | Credit risk | Impact of master netting agreements | AA      
Disclosure of external credit grades [line items]      
Carrying value (136) (254)  
Derivative investments | Over-the-counter derivative contracts | Credit risk | Impact of master netting agreements | A      
Disclosure of external credit grades [line items]      
Carrying value (603) (834)  
Derivative investments | Over-the-counter derivative contracts | Credit risk | Impact of master netting agreements | BBB      
Disclosure of external credit grades [line items]      
Carrying value 0 0  
Derivative investments | Over-the-counter derivative contracts | Credit risk | Net replacement cost      
Disclosure of external credit grades [line items]      
Carrying value 1,419 969  
Derivative investments | Over-the-counter derivative contracts | Credit risk | Net replacement cost | AA      
Disclosure of external credit grades [line items]      
Carrying value 336 228  
Derivative investments | Over-the-counter derivative contracts | Credit risk | Net replacement cost | A      
Disclosure of external credit grades [line items]      
Carrying value 1,083 726  
Derivative investments | Over-the-counter derivative contracts | Credit risk | Net replacement cost | BBB      
Disclosure of external credit grades [line items]      
Carrying value 0 15  
Derivative investments | Exchange-traded derivative contracts      
Disclosure of external credit grades [line items]      
Carrying value $ 25 $ 38