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IFRS 7 Disclosures - Variable Annuity and Segregated Fund Guarantees, Net of Reinsurance (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value $ 73,176 $ 74,442
Total reinsured, Guarantee value 30,922 4,427
Total, net of reinsurance, Guarantee value 42,254 70,015
Total gross of reinsurance, Fund value 72,650 88,558
Total reinsured, Fund value 26,327 3,649
Total, net of reinsurance, Fund value 46,323 84,909
Total gross of reinsurance, Net Amount at risk 9,750 3,781
Total reinsured, Net Amount at risk 5,921 1,024
Total, net of reinsurance, Net Amount at risk 3,829 2,757
Guaranteed minimum income benefit [Member]    
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value 4,357 4,419
Total gross of reinsurance, Fund value 2,723 3,603
Total gross of reinsurance, Net Amount at risk 1,639 918
Guaranteed minimum withdrawal benefit [Member]    
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value 38,319 39,098
Total gross of reinsurance, Fund value 34,203 41,809
Total gross of reinsurance, Net Amount at risk 5,734 2,233
Guaranteed Minimum Accumulation Benefit 1 [member]    
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value 20,035 19,820
Total gross of reinsurance, Fund value 19,945 20,226
Total gross of reinsurance, Net Amount at risk 221 12
Living benefits [Member]    
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value 62,711 63,337
Total reinsured, Guarantee value 26,999 3,788
Total gross of reinsurance, Fund value 56,871 65,638
Total reinsured, Fund value 23,691 3,102
Total gross of reinsurance, Net Amount at risk 7,594 3,163
Total reinsured, Net Amount at risk 4,860 771
Death benefits [Member]    
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]    
Total gross of reinsurance, Guarantee value 10,465 11,105
Total reinsured, Guarantee value 3,923 639
Total gross of reinsurance, Fund value 15,779 22,920
Total reinsured, Fund value 2,636 547
Total gross of reinsurance, Net Amount at risk 2,156 618
Total reinsured, Net Amount at risk $ 1,061 $ 253