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Financial Instrument Risk Management - Credit Risk Exposure By Internal Rating (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of credit risk exposure [line items]      
Notional amount $ 178,698 $ 162,948  
Mortgages and loans      
Disclosure of credit risk exposure [line items]      
Notional amount 57,619 54,600  
Amortized cost | Mortgages and loans      
Disclosure of credit risk exposure [line items]      
Notional amount 1,861 2,100  
Amortized cost | Mortgages and loans | 12-month expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 1,790 2,045  
Amortized cost | Mortgages and loans | Lifetime expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 49 50  
Amortized cost | Mortgages and loans | Lifetime expected credit losses | Financial instruments credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 22 5  
Gross carrying amount | Amortized cost | Mortgages and loans      
Disclosure of credit risk exposure [line items]      
Notional amount 1,875 2,111  
Gross carrying amount | Amortized cost | Mortgages and loans | 12-month expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 1,791 2,046  
Gross carrying amount | Amortized cost | Mortgages and loans | Lifetime expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 49 50  
Gross carrying amount | Amortized cost | Mortgages and loans | Lifetime expected credit losses | Financial instruments credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 35 15  
Gross carrying amount | Amortized cost | Mortgages and loans | Investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 1,832 2,071  
Gross carrying amount | Amortized cost | Mortgages and loans | Investment grade | 12-month expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 1,791 2,046  
Gross carrying amount | Amortized cost | Mortgages and loans | Investment grade | Lifetime expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 41 25  
Gross carrying amount | Amortized cost | Mortgages and loans | Investment grade | Lifetime expected credit losses | Financial instruments credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0 0  
Gross carrying amount | Amortized cost | Mortgages and loans | Non-investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 8 25  
Gross carrying amount | Amortized cost | Mortgages and loans | Non-investment grade | 12-month expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0 0  
Gross carrying amount | Amortized cost | Mortgages and loans | Non-investment grade | Lifetime expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 8 25  
Gross carrying amount | Amortized cost | Mortgages and loans | Non-investment grade | Lifetime expected credit losses | Financial instruments credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0 0  
Gross carrying amount | Amortized cost | Mortgages and loans | Impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 35 15  
Gross carrying amount | Amortized cost | Mortgages and loans | Impaired | 12-month expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0 0  
Gross carrying amount | Amortized cost | Mortgages and loans | Impaired | Lifetime expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0 0  
Gross carrying amount | Amortized cost | Mortgages and loans | Impaired | Lifetime expected credit losses | Financial instruments credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 35 15  
Gross carrying amount | FVOCI | Mortgages and loans      
Disclosure of credit risk exposure [line items]      
Notional amount 2,525 1,948  
Gross carrying amount | FVOCI | Mortgages and loans | 12-month expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 2,490 1,889  
Gross carrying amount | FVOCI | Mortgages and loans | Lifetime expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 27 57  
Gross carrying amount | FVOCI | Mortgages and loans | Lifetime expected credit losses | Financial instruments credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 8 2  
Gross carrying amount | FVOCI | Mortgages and loans | Investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 2,447 1,818  
Gross carrying amount | FVOCI | Mortgages and loans | Investment grade | 12-month expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 2,433 1,806  
Gross carrying amount | FVOCI | Mortgages and loans | Investment grade | Lifetime expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 14 12  
Gross carrying amount | FVOCI | Mortgages and loans | Investment grade | Lifetime expected credit losses | Financial instruments credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0 0  
Gross carrying amount | FVOCI | Mortgages and loans | Non-investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 70 128  
Gross carrying amount | FVOCI | Mortgages and loans | Non-investment grade | 12-month expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 57 83  
Gross carrying amount | FVOCI | Mortgages and loans | Non-investment grade | Lifetime expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 13 45  
Gross carrying amount | FVOCI | Mortgages and loans | Non-investment grade | Lifetime expected credit losses | Financial instruments credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0 0  
Gross carrying amount | FVOCI | Mortgages and loans | Impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 8 2  
Gross carrying amount | FVOCI | Mortgages and loans | Impaired | 12-month expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0 0  
Gross carrying amount | FVOCI | Mortgages and loans | Impaired | Lifetime expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0 0  
Gross carrying amount | FVOCI | Mortgages and loans | Impaired | Lifetime expected credit losses | Financial instruments credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 8 2  
Gross carrying amount | FVOCI | Debt securities      
Disclosure of credit risk exposure [line items]      
Notional amount 13,849 14,313  
Gross carrying amount | FVOCI | Debt securities | 12-month expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 13,829 14,223  
Gross carrying amount | FVOCI | Debt securities | Lifetime expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 20 90  
Gross carrying amount | FVOCI | Debt securities | Lifetime expected credit losses | Financial instruments credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0 0  
Gross carrying amount | FVOCI | Debt securities | Investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 13,667 13,888  
Gross carrying amount | FVOCI | Debt securities | Investment grade | 12-month expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 13,649 13,834  
Gross carrying amount | FVOCI | Debt securities | Investment grade | Lifetime expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 18 54  
Gross carrying amount | FVOCI | Debt securities | Investment grade | Lifetime expected credit losses | Financial instruments credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0 0  
Gross carrying amount | FVOCI | Debt securities | Non-investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 182 425  
Gross carrying amount | FVOCI | Debt securities | Non-investment grade | 12-month expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 180 389  
Gross carrying amount | FVOCI | Debt securities | Non-investment grade | Lifetime expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 2 36  
Gross carrying amount | FVOCI | Debt securities | Non-investment grade | Lifetime expected credit losses | Financial instruments credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0 0  
Accumulated impairment | Mortgages and loans      
Disclosure of credit risk exposure [line items]      
Notional amount 62 57 $ 43
Accumulated impairment | Mortgages and loans | 12-month expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 6 8 4
Accumulated impairment | Mortgages and loans | Lifetime expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 1 0 0
Accumulated impairment | Mortgages and loans | Lifetime expected credit losses | Financial instruments credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 55 49 39
Accumulated impairment | Debt securities      
Disclosure of credit risk exposure [line items]      
Notional amount 26 32 32
Accumulated impairment | Debt securities | 12-month expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 25 30 30
Accumulated impairment | Debt securities | Lifetime expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 1 2 2
Accumulated impairment | Debt securities | Lifetime expected credit losses | Financial instruments credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0 0 $ 0
Accumulated impairment | Amortized cost | Mortgages and loans      
Disclosure of credit risk exposure [line items]      
Notional amount 14 11  
Accumulated impairment | Amortized cost | Mortgages and loans | 12-month expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 1 1  
Accumulated impairment | Amortized cost | Mortgages and loans | Lifetime expected credit losses | Financial instruments not credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0 0  
Accumulated impairment | Amortized cost | Mortgages and loans | Lifetime expected credit losses | Financial instruments credit-impaired      
Disclosure of credit risk exposure [line items]      
Notional amount $ 13 $ 10