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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, 2019
Dec. 31, 2018
Insurance contract liabilities    
Insurance contract liabilities, beginning balance $ 121,923  
Insurance contract liabilities, change in balances on in-force policies 7,632 $ (3,094)
Insurance contract liabilities, balances arising from new policies 4,098 3,780
Insurance contract liabilities, method and assumption changes (363) (374)
Insurance contract liabilities, increase (decrease) in Insurance contract liabilities and Reinsurance assets 11,367 312
Insurance contract liabilities, other changes (123) 0
Insurance contract liabilities, foreign exchange rate movements (2,252) 3,499
Insurance contract liabilities, ending balance 131,184 121,923
Reinsurance assets    
Reinsurance assets, beginning balance 4,141  
Reinsurance assets, change in balances on in-force policies 268 (129)
Reinsurance assets, change in balances arising from new policies 136 128
Reinsurance assets, method and assumption changes (376) (96)
Reinsurance assets, increase (decrease) in Insurance contract liabilities and Reinsurance assets 28 (97)
Reinsurance assets, other changes (123) 0
Reinsurance assets, foreign exchange rate movements (163) 247
Reinsurance assets, ending balance 4,024 4,141
Net Changes In Insurance Contract Liabilities And Reinsurance Assets [Abstract]    
Net insurance contract liabilities and reinsurance assets, beginning balance 117,782  
Net change in balances on in-force policies 7,364 (2,965)
Net balance arising from new policies 3,962 3,652
Net method and assumption change 13 (278)
Net increase (decrease) in Insurance contract liabilities and Reinsurance assets 11,339 409
Net, other changes 0 0
Net foreign exchange rate movement (2,089) 3,252
Net insurance contract liabilities and reinsurance assets, ending balance 127,160 117,782
Balances before Other policy liabilities and assets    
Insurance contract liabilities    
Insurance contract liabilities, beginning balance 114,902 111,091
Insurance contract liabilities, ending balance 123,894 114,902
Reinsurance assets    
Reinsurance assets, beginning balance 3,653 3,503
Reinsurance assets, ending balance 3,395 3,653
Net Changes In Insurance Contract Liabilities And Reinsurance Assets [Abstract]    
Net insurance contract liabilities and reinsurance assets, beginning balance 111,249 107,588
Net insurance contract liabilities and reinsurance assets, ending balance 120,499 111,249
Other policy liabilities and assets    
Insurance contract liabilities    
Insurance contract liabilities, beginning balance 7,021  
Insurance contract liabilities, ending balance 7,290 7,021
Reinsurance assets    
Reinsurance assets, beginning balance 488  
Reinsurance assets, ending balance 629 488
Net Changes In Insurance Contract Liabilities And Reinsurance Assets [Abstract]    
Net insurance contract liabilities and reinsurance assets, beginning balance 6,533  
Net insurance contract liabilities and reinsurance assets, ending balance $ 6,661 $ 6,533