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Insurance Contract Liabilities and Investment Contract Liabilities - Changes in Insurance Contract Liabilities and Reinsurance Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Insurance contract liabilities    
Insurance contract liabilities, beginning balance $ 131,184  
Insurance contract liabilities, change in balances on in-force policies 9,919 $ 8,559
Insurance contract liabilities, balances arising from new policies 5,004 3,171
Insurance contract liabilities, method and assumption changes (63) (363)
Investment contract liabilities, increase (decrease) in Insurance contract liabilities and Reinsurance assets 14,860 11,367
Insurance contract liabilities, other changes 0 (123)
Insurance contract liabilities, foreign exchange rate movements (1,021) (2,252)
Insurance contract liabilities, ending balance 145,773 131,184
Reinsurance assets    
Reinsurance assets, beginning balance 4,024  
Reinsurance assets, change in balances on in-force policies (107) 268
Reinsurance assets, change in balances arising from new policies 82 136
Reinsurance assets, method and assumption changes (179) (376)
Reinsurance assets, increase (decrease) in Insurance contract liabilities and Reinsurance assets (204) 28
Reinsurance assets, other changes 0 (123)
Reinsurance assets, foreign exchange rate movements (65) (163)
Reinsurance assets, ending balance 3,843 4,024
Net Changes In Insurance Contract Liabilities And Reinsurance Assets [Abstract]    
Net insurance contract liabilities and reinsurance assets, beginning balance 127,160  
Net change in balances on in-force policies 10,026 8,291
Net balance arising from new policies 4,922 3,035
Net method and assumption change 116 13
Net increase (decrease) in Insurance contract liabilities and Reinsurance assets 15,064 11,339
Net, other changes 0 0
Net foreign exchange rate movement (956) (2,089)
Net insurance contract liabilities and reinsurance assets, ending balance 141,930 127,160
Balances before Other policy liabilities and assets    
Insurance contract liabilities    
Insurance contract liabilities, beginning balance 123,894 114,902
Insurance contract liabilities, ending balance 137,733 123,894
Reinsurance assets    
Reinsurance assets, beginning balance 3,395 3,653
Reinsurance assets, ending balance 3,126 3,395
Net Changes In Insurance Contract Liabilities And Reinsurance Assets [Abstract]    
Net insurance contract liabilities and reinsurance assets, beginning balance 120,499 111,249
Net insurance contract liabilities and reinsurance assets, ending balance 134,607 120,499
Other policy liabilities and assets    
Insurance contract liabilities    
Insurance contract liabilities, beginning balance 7,290  
Insurance contract liabilities, ending balance 8,040 7,290
Reinsurance assets    
Reinsurance assets, beginning balance 629  
Reinsurance assets, ending balance 717 629
Net Changes In Insurance Contract Liabilities And Reinsurance Assets [Abstract]    
Net insurance contract liabilities and reinsurance assets, beginning balance 6,661  
Net insurance contract liabilities and reinsurance assets, ending balance $ 7,323 $ 6,661