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Insurance Contract Liabilities and Reinsurance Assets - Summary of Change in Insurance Contract Liabilities (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of changes in insurance contract liabilities [Line Items]    
Beginning balance $ 385,554 $ 351,161
New policies 6,223 3,647
Normal in-force movement 4,160 30,622
Changes in methods and assumptions 742 5,122
Impact of changes in foreign exchange rates (4,404) (4,998)
Ending balance 392,275 385,554
Net actuarial liabilities [Member]    
Disclosure of changes in insurance contract liabilities [Line Items]    
Beginning balance 325,408 296,589
New policies 5,947 3,166
Normal in-force movement 4,689 32,340
Changes in methods and assumptions 287 563
Reinsurance transactions   (3,360)
Impact of changes in foreign exchange rates (4,059) (3,890)
Ending balance 332,272 325,408
Other insurance contract liabilities [Member]    
Disclosure of changes in insurance contract liabilities [Line Items]    
Beginning balance 14,377 13,219
Normal in-force movement 1,283 1,312
Impact of changes in foreign exchange rates (188) (154)
Ending balance 15,472 14,377
Net insurance contract liabilities [Member]    
Disclosure of changes in insurance contract liabilities [Line Items]    
Beginning balance 339,785 309,808
New policies 5,947 3,166
Normal in-force movement 5,972 33,652
Changes in methods and assumptions 287 563
Reinsurance transactions   (3,360)
Impact of changes in foreign exchange rates (4,247) (4,044)
Ending balance 347,744 339,785
Reinsurance assets [member]    
Disclosure of changes in insurance contract liabilities [Line Items]    
Beginning balance 45,769 41,353
New policies 276 481
Normal in-force movement (1,812) (3,030)
Changes in methods and assumptions 455 4,559
Reinsurance transactions   3,360
Impact of changes in foreign exchange rates (157) (954)
Ending balance $ 44,531 $ 45,769