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Goodwill and Intangible Assets - Changes in Intangible Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance $ 1,667  
Amortization charge for the year 119 $ 112
Intangible assets, ending balance 1,779 1,667
Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 2,406 2,351
Additions 117 86
Acquisitions 22 61
Disposals, intangible assets other than goodwill   3
Foreign exchange rate movements 116 (89)
Intangible assets, ending balance 2,661 2,406
Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (739) (648)
Disposals, intangible assets other than goodwill   (3)
Foreign exchange rate movements (24) 18
Amortization charge for the year (119) (112)
Intangible assets, ending balance (882) (739)
Indefinite life intangible assets    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 621  
Intangible assets, ending balance 669 621
Indefinite life intangible assets | Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 625 661
Additions 0 0
Acquisitions 3 0
Disposals, intangible assets other than goodwill   0
Foreign exchange rate movements 45 (36)
Intangible assets, ending balance 673 625
Indefinite life intangible assets | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (4) (4)
Disposals, intangible assets other than goodwill   0
Foreign exchange rate movements 0 0
Amortization charge for the year 0 0
Intangible assets, ending balance (4) (4)
Finite life, Internally generated software    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 241  
Intangible assets, ending balance 305 241
Finite life, Internally generated software | Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 579 518
Additions 118 81
Acquisitions 0 0
Disposals, intangible assets other than goodwill   3
Foreign exchange rate movements 25 (17)
Intangible assets, ending balance 722 579
Finite life, Internally generated software | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (338) (291)
Disposals, intangible assets other than goodwill   (3)
Foreign exchange rate movements (13) 9
Amortization charge for the year (66) (59)
Intangible assets, ending balance (417) (338)
Finite life, Other    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 805  
Intangible assets, ending balance 805 805
Finite life, Other | Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 1,202 1,172
Additions (1) 5
Acquisitions 19 61
Disposals, intangible assets other than goodwill   0
Foreign exchange rate movements 46 (36)
Intangible assets, ending balance 1,266 1,202
Finite life, Other | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (397) (353)
Disposals, intangible assets other than goodwill   0
Foreign exchange rate movements (11) 9
Amortization charge for the year (53) (53)
Intangible assets, ending balance $ (461) $ (397)