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Segmented Information - Summary of Results by Geographic Location (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of geographical areas [line items]    
Net premium income $ 37,853 $ 39,065
Net investment income (loss) (29,870) 11,624
Other revenue 9,164 11,132
Total revenue 17,147 61,821
Life and health insurance [Member]    
Disclosure of geographical areas [line items]    
Net premium income 35,483 36,130
Annuities and pensions [Member]    
Disclosure of geographical areas [line items]    
Net premium income 2,370 2,935
Asia [member]    
Disclosure of geographical areas [line items]    
Net premium income 21,572 23,073
Net investment income (loss) (8,468) 5,313
Other revenue 2,702 2,818
Total revenue 15,806 31,204
Asia [member] | Life and health insurance [Member]    
Disclosure of geographical areas [line items]    
Net premium income 18,786 20,515
Asia [member] | Annuities and pensions [Member]    
Disclosure of geographical areas [line items]    
Net premium income 2,786 2,558
Canada [member]    
Disclosure of geographical areas [line items]    
Net premium income 10,062 9,249
Net investment income (loss) (8,435) 1,255
Other revenue 3,246 3,363
Total revenue 4,873 13,867
Canada [member] | Life and health insurance [Member]    
Disclosure of geographical areas [line items]    
Net premium income 9,615 8,905
Canada [member] | Annuities and pensions [Member]    
Disclosure of geographical areas [line items]    
Net premium income 447 344
U.S. [member]    
Disclosure of geographical areas [line items]    
Net premium income 5,717 6,373
Net investment income (loss) (13,288) 4,830
Other revenue 3,217 4,952
Total revenue (4,354) 16,155
U.S. [member] | Life and health insurance [Member]    
Disclosure of geographical areas [line items]    
Net premium income 6,580 6,340
U.S. [member] | Annuities and pensions [Member]    
Disclosure of geographical areas [line items]    
Net premium income (863) 33
Other [Member]    
Disclosure of geographical areas [line items]    
Net premium income 502 370
Net investment income (loss) 321 226
Other revenue (1) (1)
Total revenue 822 595
Other [Member] | Life and health insurance [Member]    
Disclosure of geographical areas [line items]    
Net premium income $ 502 $ 370