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Segmented Information - Summary of Results by Geographic Location (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of geographical areas [line items]    
Net premium income $ 39,065 $ 32,917
Net investment income (loss) 11,624 35,400
Other revenue 11,132 10,591
Total revenue 61,821 78,908
Life and health insurance [Member]    
Disclosure of geographical areas [line items]    
Net premium income 36,130 29,967
Annuities and pensions [Member]    
Disclosure of geographical areas [line items]    
Net premium income 2,935 2,950
Asia [member]    
Disclosure of geographical areas [line items]    
Net premium income 23,073 20,568
Net investment income (loss) 5,313 7,085
Other revenue 2,818 2,300
Total revenue 31,204 29,953
Asia [member] | Life and health insurance [Member]    
Disclosure of geographical areas [line items]    
Net premium income 20,515 18,072
Asia [member] | Annuities and pensions [Member]    
Disclosure of geographical areas [line items]    
Net premium income 2,558 2,496
Canada [member]    
Disclosure of geographical areas [line items]    
Net premium income 9,249 8,808
Net investment income (loss) 1,255 8,531
Other revenue 3,363 2,671
Total revenue 13,867 20,010
Canada [member] | Life and health insurance [Member]    
Disclosure of geographical areas [line items]    
Net premium income 8,905 8,474
Canada [member] | Annuities and pensions [Member]    
Disclosure of geographical areas [line items]    
Net premium income 344 334
U.S. [member]    
Disclosure of geographical areas [line items]    
Net premium income 6,373 3,132
Net investment income (loss) 4,830 19,735
Other revenue 4,952 5,600
Total revenue 16,155 28,467
U.S. [member] | Life and health insurance [Member]    
Disclosure of geographical areas [line items]    
Net premium income 6,340 3,012
U.S. [member] | Annuities and pensions [Member]    
Disclosure of geographical areas [line items]    
Net premium income 33 120
Other [Member]    
Disclosure of geographical areas [line items]    
Net premium income 370 409
Net investment income (loss) 226 49
Other revenue (1) 20
Total revenue 595 478
Other [Member] | Life and health insurance [Member]    
Disclosure of geographical areas [line items]    
Net premium income $ 370 $ 409