Schedule of Non Cancelable Operating Leases (Detail) (CAD) In Millions, unless otherwise specified	Dec. 31, 2013
Operating Leased Assets [Line Items]
Lease payments under minimum commitments, 2014	177	[1]
Lease payments under minimum commitments, 2015	88	[1]
Lease payments under minimum commitments, 2016	47	[1]
Lease payments under minimum commitments, 2017	33	[1]
Lease payments under minimum commitments, 2018	12	[1]
Lease payments under minimum commitments, After 2018	32	[1]
Total lease payments under minimum commitments	389	[1]

[1] Net rental cost under cancelable and non-cancelable operating leases incurred in 2013 was $287 million (2012 - $271 million, 2011 - $226 million). Related rental income was not material.