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Goodwill and Intangible Assets - Changes in Intangible Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance $ 4,724 $ 3,370
Intangible assets, ending balance 5,174 4,724
Gross carrying value    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 6,420 4,713
Additions 433 229
Acquisitions 435 1,231
Disposals   (1)
Foreign exchange rate movements (92) 248
Intangible assets, ending balance 7,196 6,420
Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (1,696) (1,343)
Amortization charge for the year (344) (287)
Disposals   1
Impairment of intangible assets (5) (18)
Foreign exchange rate movements 23 (49)
Intangible assets, ending balance (2,022) (1,696)
Indefinite life    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 1,092  
Intangible assets, ending balance 1,194 1,092
Indefinite life | Gross carrying value    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 1,117 1,081
Additions 46 0
Acquisitions 67 0
Disposals   0
Foreign exchange rate movements (8) 36
Intangible assets, ending balance 1,222 1,117
Indefinite life | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (25) (23)
Amortization charge for the year 0 0
Disposals   0
Impairment of intangible assets (5) 0
Foreign exchange rate movements 2 (2)
Intangible assets, ending balance (28) (25)
Internally generated software    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 996  
Intangible assets, ending balance 1,004 996
Internally generated software | Gross carrying value    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 1,761 1,265
Additions 126 206
Acquisitions 0 232
Disposals   (1)
Foreign exchange rate movements (11) 59
Intangible assets, ending balance 1,876 1,761
Internally generated software | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (765) (615)
Amortization charge for the year (113) (113)
Disposals   1
Impairment of intangible assets 0 (16)
Foreign exchange rate movements 6 (22)
Intangible assets, ending balance (872) (765)
Other    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 2,636  
Intangible assets, ending balance 2,976 2,636
Other | Gross carrying value    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 3,542 2,367
Additions 261 23
Acquisitions 368 999
Disposals   0
Foreign exchange rate movements (73) 153
Intangible assets, ending balance 4,098 3,542
Other | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (906) (705)
Amortization charge for the year (231) (174)
Disposals   0
Impairment of intangible assets 0 (2)
Foreign exchange rate movements 15 (25)
Intangible assets, ending balance $ (1,122) $ (906)