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IFRS 7 Disclosures - Variable Annuity and Segregated Fund Guarantees, Net of Reinsurance (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value $ 74,442 $ 76,240
Total reinsured, Guarantee value 4,427 4,602
Total, net of reinsurance, Guarantee value 70,015 71,638
Total gross of reinsurance, Fund value 88,558 86,210
Total reinsured, Fund value 3,649 3,691
Total, net of reinsurance, Fund value 84,909 82,519
Total gross of reinsurance, Net Amount at risk 3,781 4,910
Total reinsured, Net Amount at risk 1,024 1,177
Total, net of reinsurance, Net Amount at risk 2,757 3,733
Guaranteed minimum income benefit [Member]    
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value 4,419 4,555
Total gross of reinsurance, Fund value 3,603 3,642
Total gross of reinsurance, Net Amount at risk 918 1,064
Guaranteed minimum withdrawal benefit [Member]    
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value 39,098 42,570
Total gross of reinsurance, Fund value 41,809 44,075
Total gross of reinsurance, Net Amount at risk 2,233 3,128
Guaranteed Minimum Accumulation Benefit 1 [member]    
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value 19,820 18,463
Total gross of reinsurance, Fund value 20,226 18,945
Total gross of reinsurance, Net Amount at risk 12 8
Living benefits [Member]    
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value 63,337 65,588
Total reinsured, Guarantee value 3,788 3,917
Total gross of reinsurance, Fund value 65,638 66,662
Total reinsured, Fund value 3,102 3,157
Total gross of reinsurance, Net Amount at risk 3,163 4,200
Total reinsured, Net Amount at risk 771 895
Death benefits [Member]    
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value 11,105 10,652
Total reinsured, Guarantee value 639 685
Total gross of reinsurance, Fund value 22,920 19,548
Total reinsured, Fund value 547 534
Total gross of reinsurance, Net Amount at risk 618 710
Total reinsured, Net Amount at risk $ 253 $ 282