Summary of Change in Accumulated Other Comprehensive Income (Detail) (CAD) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
(Charge)/credit to other comprehensive income, before tax	990	(304)	(1,093)
Deferred income tax (charge)/credit (note 17)	(256)	87	279
(Charge)/credit to other comprehensive income, after tax	734	(217)	(814)