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Segmented Information - Summary of Results by Geographic Location (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of geographical areas [line items]    
Net premium income $ 24,012 $ 28,210
Net investment income (loss) 4,532 19,367
Other revenue 10,428 10,746
Total revenue 38,972 58,323
Life and health insurance [Member]    
Disclosure of geographical areas [line items]    
Net premium income 30,352 24,355
Annuities and pensions [Member]    
Disclosure of geographical areas [line items]    
Net premium income (6,340) 3,855
Asia [member]    
Disclosure of geographical areas [line items]    
Net premium income 18,185 15,783
Net investment income (loss) 371 4,258
Other revenue 2,115 1,632
Total revenue 20,671 21,673
Asia [member] | Life and health insurance [Member]    
Disclosure of geographical areas [line items]    
Net premium income 15,010 13,215
Asia [member] | Annuities and pensions [Member]    
Disclosure of geographical areas [line items]    
Net premium income 3,175 2,568
Canada [member]    
Disclosure of geographical areas [line items]    
Net premium income 9,013 4,337
Net investment income (loss) 2,933 4,642
Other revenue 2,904 3,187
Total revenue 14,850 12,166
Canada [member] | Life and health insurance [Member]    
Disclosure of geographical areas [line items]    
Net premium income 8,561 3,894
Canada [member] | Annuities and pensions [Member]    
Disclosure of geographical areas [line items]    
Net premium income 452 443
U.S. [member]    
Disclosure of geographical areas [line items]    
Net premium income (3,625) 7,624
Net investment income (loss) 1,032 10,407
Other revenue 5,395 5,911
Total revenue 2,802 23,942
U.S. [member] | Life and health insurance [Member]    
Disclosure of geographical areas [line items]    
Net premium income 6,342 6,780
U.S. [member] | Annuities and pensions [Member]    
Disclosure of geographical areas [line items]    
Net premium income (9,967) 844
Other [Member]    
Disclosure of geographical areas [line items]    
Net premium income 439 466
Net investment income (loss) 196 60
Other revenue 14 16
Total revenue 649 542
Other [Member] | Life and health insurance [Member]    
Disclosure of geographical areas [line items]    
Net premium income $ 439 $ 466