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Goodwill and Intangible Assets - Summary of Carrying Amounts of Goodwill and Intangible Assets (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Goodwill Beginning balance $ 6,014 $ 5,651
Total intangible assets Beginning balance 4,505 4,264
Goodwill Net additions/ (disposals)   255
Effect of changes in foreign exchange rates (95) 108
Total intangible assets Net additions/ (disposals) 312 433
Goodwill Ending balance 5,919 6,014
Total goodwill and intangible assets Net additions/ (disposals) 312 688
Total goodwill and intangible assets Beginning balance 10,519 9,915
Amortization expense (328) (344)
Effect of changes in foreign exchange rates - Total intangible assets 193 260
Effect of changes in foreign exchange rates (98) 152
Total goodwill and intangible assets Ending balance 10,310 10,519
Total intangible assets Ending balance 4,391 4,505
Distribution networks [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 881 888
Total intangible assets Net additions/ (disposals) 31 6
Amortization expense (53) (47)
Effect of changes in foreign exchange rates - Total intangible assets (25) 34
Total intangible assets Ending balance 834 881
Customer relationships [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 643 687
Total intangible assets Net additions/ (disposals) (4)  
Amortization expense (53) (56)
Effect of changes in foreign exchange rates - Total intangible assets (4) 12
Total intangible assets Ending balance 582 643
Software [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 1,068 1,091
Total intangible assets Net additions/ (disposals) 274 192
Amortization expense (217) (235)
Effect of changes in foreign exchange rates - Total intangible assets (23) 20
Total intangible assets Ending balance 1,102 1,068
Other [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 52 49
Total intangible assets Net additions/ (disposals) 11 7
Amortization expense (5) (6)
Effect of changes in foreign exchange rates - Total intangible assets (10) 2
Total intangible assets Ending balance 48 52
Finite life intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 2,644 2,715
Total intangible assets Net additions/ (disposals) 312 205
Amortization expense (328) (344)
Effect of changes in foreign exchange rates - Total intangible assets (62) 68
Total intangible assets Ending balance 2,566 2,644
Brand [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 813 761
Effect of changes in foreign exchange rates - Total intangible assets (22) 52
Total intangible assets Ending balance 791 813
Fund management contracts and other [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 1,048 788
Total intangible assets Net additions/ (disposals)   228
Effect of changes in foreign exchange rates - Total intangible assets (14) 32
Total intangible assets Ending balance 1,034 1,048
Indefinite life intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 1,861 1,549
Total intangible assets Net additions/ (disposals)   228
Effect of changes in foreign exchange rates - Total intangible assets (36) 84
Total intangible assets Ending balance $ 1,825 $ 1,861