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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, 2022
Dec. 31, 2021
Disclosure of changes in insurance contract liabilities [Line Items]    
Beginning balance $ 392,275 $ 385,554
New policies 5,481 6,223
Normal in-force movement (39,000) 4,160
Changes in methods and assumptions 269 742
Reinsurance transactions (1,469)  
Impact of changes in foreign exchange rates 13,849 (4,404)
Ending balance 371,405 392,275
Net actuarial liabilities [Member]    
Disclosure of changes in insurance contract liabilities [Line Items]    
Beginning balance 332,272 325,408
New policies 5,365 5,947
Normal in-force movement (39,174) 4,689
Changes in methods and assumptions 112 287
Reinsurance transactions (2,419)  
Impact of changes in foreign exchange rates 10,439 (4,059)
Ending balance 306,595 332,272
Other insurance contract liabilities [Member]    
Disclosure of changes in insurance contract liabilities [Line Items]    
Beginning balance 15,472 14,377
Normal in-force movement 1,216 1,283
Changes in methods and assumptions (192)  
Impact of changes in foreign exchange rates 640 (188)
Ending balance 17,136 15,472
Net insurance contract liabilities [Member]    
Disclosure of changes in insurance contract liabilities [Line Items]    
Beginning balance 347,744 339,785
New policies 5,365 5,947
Normal in-force movement (37,958) 5,972
Changes in methods and assumptions (80) 287
Reinsurance transactions (2,419)  
Impact of changes in foreign exchange rates 11,079 (4,247)
Ending balance 323,731 347,744
Reinsurance assets [member]    
Disclosure of changes in insurance contract liabilities [Line Items]    
Beginning balance 44,531 45,769
New policies 116 276
Normal in-force movement (1,042) (1,812)
Changes in methods and assumptions 349 455
Reinsurance transactions 950  
Impact of changes in foreign exchange rates 2,770 (157)
Ending balance $ 47,674 $ 44,531