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Share Capital and Earnings Per share - Schedule of Dividends Payable on Non-cumulative Preferred Shares (Detail) - Major ordinary share transactions [Member]
Feb. 21, 2017
CAD / shares
Class 1, Series 11 Preferred shares [Member]  
Disclosure of Dividends [Line Items]  
Dividend declared but not paid CAD 0.250000
Class 1, Series 13 Preferred shares [Member]  
Disclosure of Dividends [Line Items]  
Dividend declared but not paid 0.237500
Class 1, Series 15 Preferred shares [Member]  
Disclosure of Dividends [Line Items]  
Dividend declared but not paid 0.243750
Class 1, Series 17 Preferred shares [Member]  
Disclosure of Dividends [Line Items]  
Dividend declared but not paid 0.243750
Class 1, Series 19 Preferred shares [Member]  
Disclosure of Dividends [Line Items]  
Dividend declared but not paid 0.237500
Class 1, Series 21 Preferred shares [Member]  
Disclosure of Dividends [Line Items]  
Dividend declared but not paid 0.350000
Class 1, Series 23 Preferred shares [Member]  
Disclosure of Dividends [Line Items]  
Dividend declared but not paid 0.303125
Class A, Series 2 Preferred shares [Member]  
Disclosure of Dividends [Line Items]  
Dividend declared but not paid 0.290630
Class A, Series 3 Preferred shares [Member]  
Disclosure of Dividends [Line Items]  
Dividend declared but not paid 0.281250
Class 1, Series 3 Preferred shares [Member]  
Disclosure of Dividends [Line Items]  
Dividend declared but not paid 0.136125
Class 1, Series 4 Preferred shares [Member]  
Disclosure of Dividends [Line Items]  
Dividend declared but not paid 0.141103
Class 1, Series 5 Preferred shares [Member]  
Disclosure of Dividends [Line Items]  
Dividend declared but not paid 0.243188
Class 1, Series 7 Preferred shares [Member]  
Disclosure of Dividends [Line Items]  
Dividend declared but not paid 0.269500
Class 1, Series 9 Preferred shares [Member]  
Disclosure of Dividends [Line Items]  
Dividend declared but not paid CAD 0.271938