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Goodwill and Intangible Assets - Changes in Intangible Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance $ 1,779  
Impairment loss recognised in profit or loss, intangible assets other than goodwill (15) $ 0
Amortization charge for the year (137) (119)
Intangible assets, ending balance 2,083 1,779
Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 2,661 2,406
Additions 266 117
Acquisitions 238 22
Foreign exchange rate movements (71) 116
Intangible assets, ending balance 3,094 2,661
Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (882) (739)
Impairment loss recognised in profit or loss, intangible assets other than goodwill (15)  
Foreign exchange rate movements 23 (24)
Amortization charge for the year (137) 119
Intangible assets, ending balance (1,011) (882)
Indefinite life intangible assets    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 669  
Intangible assets, ending balance 640 669
Indefinite life intangible assets | Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 673 625
Additions 0 0
Acquisitions 0 3
Foreign exchange rate movements (27) 45
Intangible assets, ending balance 646 673
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)
Impairment loss recognised in profit or loss, intangible assets other than goodwill (2)  
Foreign exchange rate movements 0 0
Amortization charge for the year 0 0
Intangible assets, ending balance (6) (4)
Finite life, Internally generated software    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 305  
Intangible assets, ending balance 369 305
Finite life, Internally generated software | Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 722 579
Additions 151 118
Acquisitions 0 0
Foreign exchange rate movements (16) 25
Intangible assets, ending balance 857 722
Finite life, Internally generated software | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (417) (338)
Impairment loss recognised in profit or loss, intangible assets other than goodwill (13)  
Foreign exchange rate movements 15 (13)
Amortization charge for the year (73) 66
Intangible assets, ending balance (488) (417)
Finite life, Other    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 805  
Intangible assets, ending balance 1,074 805
Finite life, Other | Gross carrying amount    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 1,266 1,202
Additions 115 (1)
Acquisitions 238 19
Foreign exchange rate movements (28) 46
Intangible assets, ending balance 1,591 1,266
Finite life, Other | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance (461) (397)
Impairment loss recognised in profit or loss, intangible assets other than goodwill 0  
Foreign exchange rate movements 8 (11)
Amortization charge for the year (64) 53
Intangible assets, ending balance $ (517) $ (461)