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Risk Management - Credit Default Swaps (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of credit risk exposure [line items]    
Notional amount $ 499,021 $ 440,077
Credit protection purchased 0 0
Credit default swaps    
Disclosure of credit risk exposure [line items]    
Notional amount 114 131
Total fair value $ 2 $ 3
Weighted average maturity 3 years 3 years
Credit default swaps | AA    
Disclosure of credit risk exposure [line items]    
Notional amount $ 23 $ 23
Total fair value $ 1 $ 1
Weighted average maturity 3 years 4 years
Credit default swaps | A    
Disclosure of credit risk exposure [line items]    
Notional amount $ 68 $ 94
Total fair value $ 1 $ 2
Weighted average maturity 3 years 3 years
Credit default swaps | BBB    
Disclosure of credit risk exposure [line items]    
Notional amount $ 23 $ 14
Total fair value $ 0 $ 0
Weighted average maturity 2 years 1 year
Credit default swaps | CDS Credit    
Disclosure of credit risk exposure [line items]    
Notional amount $ 114 $ 131
Total fair value $ 2 $ 3
Weighted average maturity 3 years 3 years