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Goodwill and Intangible Assets - Change in Carrying Value of Goodwill and Intangible Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Apr. 30, 2024
Reconciliation of changes in intangible assets and goodwill [abstract]      
Goodwill at beginning of period $ 5,919 $ 6,014  
Intangible assets at beginning of period 4,391 4,505  
Intangible assets and goodwill at beginning of period 10,310 10,519  
Net additions / (disposals), goodwill 150 0  
Net additions / (disposals), intangible assets 508 312  
Net additions / (disposals), goodwill and intangible assets 658 312  
Amortization expense (374) (328)  
Effect of changes in foreign exchange rates 206 (95)  
Effect of changes in foreign exchange rates, intangible assets 252 (98)  
Effect of changes in foreign exchange rates, goodwill and intangible assets 458 (193)  
Goodwill at end of period 6,275 5,919  
Intangible assets at end of period 4,777 4,391  
Goodwill and intangible assets at end of period 11,052 10,310  
CQS Management Limited      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Percentage of voting equity interests acquired     100.00%
Cash consideration     $ 334
Contingent consideration     8
Goodwill     150
Canada WAM      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Goodwill at beginning of period 1,436 1,436  
Net additions / (disposals), goodwill 0 0  
Effect of changes in foreign exchange rates 0 0  
Goodwill at end of period 1,436 1,436  
U.S. WAM      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Goodwill at beginning of period 1,250 1,286  
Net additions / (disposals), goodwill 150 0  
Effect of changes in foreign exchange rates 121 (36)  
Goodwill at end of period 1,521 1,250  
Distribution networks      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets at beginning of period 834 881  
Net additions / (disposals), intangible assets 13 31  
Amortization expense (56) (53)  
Effect of changes in foreign exchange rates, intangible assets 49 (25)  
Intangible assets at end of period 840 834  
Gross carrying amount of finite life intangible assets 1,617 1,511  
Customer relationships      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets at beginning of period 582 643  
Net additions / (disposals), intangible assets 0 (4)  
Amortization expense (52) (53)  
Effect of changes in foreign exchange rates, intangible assets 12 (4)  
Intangible assets at end of period 542 582  
Gross carrying amount of finite life intangible assets 1,156 1,136  
Software      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets at beginning of period 1,102 1,068  
Net additions / (disposals), intangible assets 329 274  
Amortization expense (257) (217)  
Effect of changes in foreign exchange rates, intangible assets 38 (23)  
Intangible assets at end of period 1,212 1,102  
Gross carrying amount of finite life intangible assets 3,408 2,955  
Other      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets at beginning of period 48 52  
Net additions / (disposals), intangible assets 7 11  
Amortization expense (9) (5)  
Effect of changes in foreign exchange rates, intangible assets 13 (10)  
Intangible assets at end of period 59 48  
Gross carrying amount of finite life intangible assets 156 138  
Finite life intangible assets      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets at beginning of period 2,566 2,644  
Net additions / (disposals), intangible assets 349 312  
Amortization expense (374) (328)  
Effect of changes in foreign exchange rates, intangible assets 112 (62)  
Intangible assets at end of period 2,653 2,566  
Finite life intangible assets | CQS Management Limited      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Identifiable intangible assets recognised as of acquisition date     7
Brand      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets at beginning of period 791 813  
Net additions / (disposals), intangible assets 3 0  
Effect of changes in foreign exchange rates, intangible assets 72 (22)  
Intangible assets at end of period 866 791  
Brand | CQS Management Limited      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Identifiable intangible assets recognised as of acquisition date     3
Fund management contracts and other      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets at beginning of period 1,034 1,048  
Net additions / (disposals), intangible assets 156 0  
Effect of changes in foreign exchange rates, intangible assets 68 (14)  
Intangible assets at end of period 1,258 1,034  
Fund management contracts and other | Canada WAM      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets at beginning of period 273    
Intangible assets at end of period 273 273  
Fund management contracts and other | U.S. WAM      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets at beginning of period 386    
Intangible assets at end of period 421 386  
Indefinite life intangible assets      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets at beginning of period 1,825 1,861  
Net additions / (disposals), intangible assets 159 0  
Effect of changes in foreign exchange rates, intangible assets 140 (36)  
Intangible assets at end of period $ 2,124 $ 1,825  
Indefinite life intangible assets | CQS Management Limited      
Reconciliation of changes in intangible assets and goodwill [abstract]      
Identifiable intangible assets recognised as of acquisition date     $ 153