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IFRS 7 Disclosures - Variable Annuity and Segregated Fund Guarantees, Net of Reinsurance (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value $ 95,032 $ 95,873
Total reinsured, Guarantee value 6,868 7,536
Total, net of reinsurance, Guarantee value 88,164 88,337
Total gross of reinsurance, Fund value 86,263 96,385
Total reinsured, Fund value 5,243 6,707
Total, net of reinsurance, Fund value 81,020 89,678
Total gross of reinsurance, Amount at risk 14,689 8,029
Total reinsured, Amount at risk 1,836 1,346
Total, net of reinsurance, Amount at risk 12,853 6,683
Guaranteed minimum income benefit [Member]    
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value 5,264 5,201
Total gross of reinsurance, Fund value 3,675 4,195
Total gross of reinsurance, Amount at risk 1,593 1,074
Guaranteed minimum withdrawal benefit [Member]    
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value 60,494 61,767
Total gross of reinsurance, Fund value 49,214 56,512
Total gross of reinsurance, Amount at risk 11,388 5,943
Guaranteed Minimum Accumulation Benefit 1 [member]    
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value 18,611 18,162
Total gross of reinsurance, Fund value 18,720 18,705
Total gross of reinsurance, Amount at risk 141 11
Living benefits [Member]    
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value 84,369 85,130
Total reinsured, Guarantee value 4,515 4,522
Total gross of reinsurance, Fund value 71,609 79,412
Total reinsured, Fund value 3,173 3,667
Total gross of reinsurance, Amount at risk 13,122 7,028
Total reinsured, Amount at risk 1,343 911
Death benefits [Member]    
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value 10,663 10,743
Total reinsured, Guarantee value 2,353 3,014
Total gross of reinsurance, Fund value 14,654 16,973
Total reinsured, Fund value 2,070 3,040
Total gross of reinsurance, Amount at risk 1,567 1,001
Total reinsured, Amount at risk $ 493 $ 435