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Financial Instrument Risk Management - Maturity Analysis for Insurance Contracts (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of credit risk exposure [line items]      
Insurance contract liabilities $ 154,710 $ 154,433 $ 175,491
Insurance contract assets (184) (75) (162)
Reinsurance contract held liabilities 1,623 1,603 1,994
Reinsurance contract held assets (5,794) (6,115) (6,612)
Estimates of PV of future cash flows      
Disclosure of credit risk exposure [line items]      
Insurance contract liabilities 583,616 498,264  
Insurance contract assets (4,840) (5,193)  
Reinsurance contract held liabilities 5,533 5,566  
Reinsurance contract held assets (12,208) (13,007)  
Insurance      
Disclosure of credit risk exposure [line items]      
Insurance contract liabilities 135,669 131,294 149,412
Insurance contract assets (184) (75) (162)
Insurance | Financial liabilities      
Disclosure of credit risk exposure [line items]      
Amounts payable on demand 4,800 4,779  
Insurance | Financial assets      
Disclosure of credit risk exposure [line items]      
Amounts payable on demand 0 0  
Reinsurance contracts held      
Disclosure of credit risk exposure [line items]      
Insurance contract liabilities 1,623 1,603 1,994
Insurance contract assets (5,794) (6,115) $ (6,612)
Reinsurance contracts held | Financial liabilities      
Disclosure of credit risk exposure [line items]      
Amounts payable on demand 0 0  
Reinsurance contracts held | Financial assets      
Disclosure of credit risk exposure [line items]      
Amounts payable on demand (33) (88)  
Due in 1 year or less | Estimates of PV of future cash flows      
Disclosure of credit risk exposure [line items]      
Insurance contract liabilities 11,428 11,980  
Insurance contract assets (463) (324)  
Reinsurance contract held liabilities 140 132  
Reinsurance contract held assets (520) (684)  
1-2 years | Estimates of PV of future cash flows      
Disclosure of credit risk exposure [line items]      
Insurance contract liabilities 3,670 4,111  
Insurance contract assets (323) (341)  
Reinsurance contract held liabilities 83 80  
Reinsurance contract held assets (54) (20)  
2-3 years | Estimates of PV of future cash flows      
Disclosure of credit risk exposure [line items]      
Insurance contract liabilities 3,887 4,018  
Insurance contract assets (276) (287)  
Reinsurance contract held liabilities 88 86  
Reinsurance contract held assets (69) (31)  
3-4 years | Estimates of PV of future cash flows      
Disclosure of credit risk exposure [line items]      
Insurance contract liabilities 4,128 4,278  
Insurance contract assets (248) (254)  
Reinsurance contract held liabilities 91 89  
Reinsurance contract held assets (105) (66)  
4-5 years | Estimates of PV of future cash flows      
Disclosure of credit risk exposure [line items]      
Insurance contract liabilities 4,451 4,511  
Insurance contract assets (225) (234)  
Reinsurance contract held liabilities 95 94  
Reinsurance contract held assets (130) (104)  
Over 5 Years | Estimates of PV of future cash flows      
Disclosure of credit risk exposure [line items]      
Insurance contract liabilities 556,052 469,366  
Insurance contract assets (3,305) (3,753)  
Reinsurance contract held liabilities 5,036 5,085  
Reinsurance contract held assets $ (11,330) $ (12,102)