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Goodwill and Intangible Assets - Summary of Carrying Amounts of Goodwill and Intangible Assets (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Goodwill Beginning balance $ 5,713 $ 5,884
Total intangible assets Beginning balance 4,127 4,223
Goodwill Additions/ disposals (65)  
Total intangible assets Additions/ Disposals 145 303
Effect of changes in foreign exchange rates 216 (171)
Goodwill Ending balance 5,864 5,713
Total goodwill and intangible assets Beginning balance 9,840 10,107
Total goodwill and intangible assets Additions/ Disposals 80 303
Amortization expense 255 229
Effect of changes in foreign exchange rates 432 (341)
Effect of changes in foreign exchange rates - Total intangible assets 216 (170)
Total goodwill and intangible assets Ending balance 10,097 9,840
Total intangible assets Ending balance 4,233 4,127
Distribution networks [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 989 1,093
Total intangible assets Additions/ Disposals (133)  
Amortization expense 48 47
Effect of changes in foreign exchange rates - Total intangible assets 60 (57)
Total intangible assets Ending balance 868 989
Customer relationships [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 899 969
Amortization expense 55 56
Effect of changes in foreign exchange rates - Total intangible assets 16 (14)
Total intangible assets Ending balance 860 899
Software [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 661 494
Total intangible assets Additions/ Disposals 275 303
Amortization expense 147 121
Effect of changes in foreign exchange rates - Total intangible assets 32 (15)
Total intangible assets Ending balance 821 661
Other [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 70 77
Amortization expense 5 5
Effect of changes in foreign exchange rates - Total intangible assets 2 (2)
Total intangible assets Ending balance 67 70
Finite life intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 2,619 2,633
Total intangible assets Additions/ Disposals 142 303
Amortization expense 255 229
Effect of changes in foreign exchange rates - Total intangible assets 110 (88)
Total intangible assets Ending balance 2,616 2,619
Brand [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 753 805
Effect of changes in foreign exchange rates - Total intangible assets 66 (52)
Total intangible assets Ending balance 819 753
Fund management contracts and other [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 755 785
Total intangible assets Additions/ Disposals 3  
Effect of changes in foreign exchange rates - Total intangible assets 40 (30)
Total intangible assets Ending balance 798 755
Indefinite life intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 1,508 1,590
Total intangible assets Additions/ Disposals 3  
Effect of changes in foreign exchange rates - Total intangible assets 106 (82)
Total intangible assets Ending balance $ 1,617 $ 1,508