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Goodwill and Intangible Assets - Summary of Carrying Amounts of Goodwill and Intangible Assets (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Goodwill Beginning balance CAD 5,884 CAD 5,685
Total intangible assets Beginning balance 4,223 3,699
Goodwill Additions/ disposals   256
Total intangible assets Additions/ Disposals 306 840
Effect of changes in foreign exchange rates (171) (57)
Goodwill Ending balance 5,713 5,884
Total goodwill and intangible assets Beginning balance 10,107 9,384
Total goodwill and intangible assets Additions/ Disposals 306 1,096
Amortization expense 229 234
Effect of changes in foreign exchange rates (344) (139)
Effect of changes in foreign exchange rates - Total intangible assets (173) (82)
Total goodwill and intangible assets Ending balance 9,840 10,107
Total intangible assets Ending balance 4,127 4,223
Distribution networks [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 1,093 726
Total intangible assets Additions/ Disposals   450
Amortization expense 47 50
Effect of changes in foreign exchange rates - Total intangible assets (57) (33)
Total intangible assets Ending balance 989 1,093
Customer relationships [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 969 947
Total intangible assets Additions/ Disposals   79
Amortization expense 56 53
Effect of changes in foreign exchange rates - Total intangible assets (14) (4)
Total intangible assets Ending balance 899 969
Software [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 494 396
Total intangible assets Additions/ Disposals 306 229
Amortization expense 121 126
Effect of changes in foreign exchange rates - Total intangible assets (18) (5)
Total intangible assets Ending balance 661 494
Other [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 77 76
Total intangible assets Additions/ Disposals   6
Amortization expense 5 5
Effect of changes in foreign exchange rates - Total intangible assets (2)  
Total intangible assets Ending balance 70 77
Finite life intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 2,633 2,145
Total intangible assets Additions/ Disposals 306 764
Amortization expense 229 234
Effect of changes in foreign exchange rates - Total intangible assets (91) (42)
Total intangible assets Ending balance 2,619 2,633
Brand [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 805 831
Effect of changes in foreign exchange rates - Total intangible assets (52) (26)
Total intangible assets Ending balance 753 805
Fund management contracts and other [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 785 723
Total intangible assets Additions/ Disposals   76
Effect of changes in foreign exchange rates - Total intangible assets (30) (14)
Total intangible assets Ending balance 755 785
Indefinite life intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Total intangible assets Beginning balance 1,590 1,554
Total intangible assets Additions/ Disposals   76
Effect of changes in foreign exchange rates - Total intangible assets (82) (40)
Total intangible assets Ending balance CAD 1,508 CAD 1,590