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Goodwill and Intangible Assets - Changes in Intangible Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance $ 2,083  
Amortization charge for the year (156) $ (137)
Impairment of intangible assets (11) (15)
Intangible assets, ending balance 2,477 2,083
Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 3,094 2,661
Additions 230 266
Acquisitions 358 238
Foreign exchange rate movements (31) (71)
Disposals (9)  
Intangible assets, ending balance 3,642 3,094
Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (1,011) (882)
Foreign exchange rate movements 13 23
Amortization charge for the year (156) (137)
Impairment of intangible assets (11) (15)
Intangible assets, ending balance (1,165) (1,011)
Indefinite life intangible assets    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 640  
Intangible assets, ending balance 924 640
Indefinite life intangible assets | Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 646 673
Additions 0 0
Acquisitions 295 0
Foreign exchange rate movements (3) (27)
Disposals 0  
Intangible assets, ending balance 938 646
Indefinite life intangible assets | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (6) (4)
Foreign exchange rate movements 1 0
Amortization charge for the year 0 0
Impairment of intangible assets (9) (2)
Intangible assets, ending balance (14) (6)
Finite life, Internally generated software    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 369  
Intangible assets, ending balance 509 369
Finite life, Internally generated software | Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 857 722
Additions 230 151
Acquisitions 0 0
Foreign exchange rate movements (13) (16)
Disposals (4)  
Intangible assets, ending balance 1,070 857
Finite life, Internally generated software | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (488) (417)
Foreign exchange rate movements 7 15
Amortization charge for the year (78) (73)
Impairment of intangible assets (2) (13)
Intangible assets, ending balance (561) (488)
Finite life, Other    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 1,074  
Intangible assets, ending balance 1,044 1,074
Finite life, Other | Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 1,591 1,266
Additions 0 115
Acquisitions 63 238
Foreign exchange rate movements (15) (28)
Disposals (5)  
Intangible assets, ending balance 1,634 1,591
Finite life, Other | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (517) (461)
Foreign exchange rate movements 5 8
Amortization charge for the year (78) (64)
Impairment of intangible assets 0 0
Intangible assets, ending balance $ (590) $ (517)