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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, 2018
Dec. 31, 2017
Insurance contract liabilities    
Insurance contract liabilities, beginning balance $ 117,785  
Insurance contract liabilities, change in balances on in-force policies (3,094) $ 2,757
Insurance contract liabilities, balances arising from new policies 3,780 2,941
Insurance contract liabilities, method and assumption changes (374) (371)
Insurance contract liabilities, increase (decrease) in Insurance contract liabilities and Reinsurance assets 312 5,327
Insurance contract liabilities, foreign exchange rate movements 3,499 (2,647)
Insurance contract liabilities, ending balance 121,923 117,785
Reinsurance assets    
Reinsurance assets, beginning balance 4,028  
Reinsurance assets, change in balances on in-force policies (129) (779)
Reinsurance assets, change in balances arising from new policies 128 156
Reinsurance assets, method and assumption changes (96) (198)
Reinsurance assets, increase (decrease) in Insurance contract liabilities and Reinsurance assets (97) (821)
Reinsurance assets, foreign exchange rate movements 247 (217)
Reinsurance assets, ending balance 4,141 4,028
Net Changes In Insurance Contract Liabilities And Reinsurance Assets [Abstract]    
Net insurance contract liabilities and reinsurance assets, beginning balance 113,757  
Net change in balances on in-force policies (2,965) 3,536
Net balance arising from new policies 3,652 2,785
Net method and assumption change (278) (173)
Net increase (decrease) in Insurance contract liabilities and Reinsurance assets 409 6,148
Net foreign exchange rate movement 3,252 (2,430)
Net insurance contract liabilities and reinsurance assets, ending balance 117,782 113,757
Balances before Other policy liabilities and assets    
Insurance contract liabilities    
Insurance contract liabilities, beginning balance 111,091 108,411
Insurance contract liabilities, ending balance 114,902 111,091
Reinsurance assets    
Reinsurance assets, beginning balance 3,503 4,541
Reinsurance assets, ending balance 3,653 3,503
Net Changes In Insurance Contract Liabilities And Reinsurance Assets [Abstract]    
Net insurance contract liabilities and reinsurance assets, beginning balance 107,588 103,870
Net insurance contract liabilities and reinsurance assets, ending balance 111,249 107,588
Other policy liabilities and assets    
Insurance contract liabilities    
Insurance contract liabilities, beginning balance 6,694  
Insurance contract liabilities, ending balance 7,021 6,694
Reinsurance assets    
Reinsurance assets, beginning balance 525  
Reinsurance assets, ending balance 488 525
Net Changes In Insurance Contract Liabilities And Reinsurance Assets [Abstract]    
Net insurance contract liabilities and reinsurance assets, beginning balance 6,169  
Net insurance contract liabilities and reinsurance assets, ending balance $ 6,533 $ 6,169