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Goodwill and Intangible Assets - Changes in Intangible Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Internally generated software    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance $ 1,004  
Intangible assets, ending balance 1,122 $ 1,004
Internally generated software | Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 1,876 1,761
Additions 303 126
Acquisitions   0
Disposals (21)  
Foreign exchange rate movements 70 (11)
Intangible assets, ending balance 2,228 1,876
Internally generated software | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (872) (765)
Amortization charge for the year (218) (113)
Disposals 21  
Impairment of intangible assets 0 0
Foreign exchange rate movements (37) 6
Intangible assets, ending balance (1,106) (872)
Other    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 2,976  
Intangible assets, ending balance 2,701 2,976
Other | Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 4,098 3,542
Additions 3 261
Acquisitions   368
Disposals 0  
Foreign exchange rate movements 236 (73)
Intangible assets, ending balance 4,337 4,098
Other | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (1,122) (906)
Amortization charge for the year (259) (231)
Disposals 0  
Impairment of intangible assets (195) 0
Foreign exchange rate movements (60) 15
Intangible assets, ending balance (1,636) (1,122)
Intangible assets, beginning balance 5,174  
Intangible assets, ending balance 5,058 5,174
Goodwill and intangible recoverable amount based on value-in-use 303  
Asia    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Impairment of intangible assets (186)  
Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 7,196 6,420
Additions 306 433
Acquisitions   435
Disposals (68)  
Foreign exchange rate movements 404 (92)
Intangible assets, ending balance 7,838 7,196
Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (2,022) (1,696)
Amortization charge for the year (477) (344)
Disposals 21  
Impairment of intangible assets (201) (5)
Foreign exchange rate movements (101) 23
Intangible assets, ending balance (2,780) (2,022)
Indefinite life    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 1,194  
Intangible assets, ending balance 1,235 1,194
Indefinite life | Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 1,222 1,117
Additions 0 46
Acquisitions   67
Disposals (47)  
Foreign exchange rate movements 98 (8)
Intangible assets, ending balance 1,273 1,222
Indefinite life | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (28) (25)
Amortization charge for the year 0 0
Disposals 0  
Impairment of intangible assets (6) (5)
Foreign exchange rate movements (4) 2
Intangible assets, ending balance $ (38) $ (28)