Other Long-Term Obligations (Detail) (CAD) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Schedule of Other Liabilities [Line Items]
Employee retirement benefits	1,237	[1]	1,448	[1]
Asset retirement obligations and other environmental liabilities	1,139	[2]	1,258	[2]
Share-based incentive compensation liabilities	222		140
Other obligations	219		245
Total other long-term obligations	2,817		3,091

[1] Total recorded employee retirement benefits obligations also included $53 million in current liabilities (2013 - $53 million).

[2] Total asset retirement obligations and other environmental liabilities also included $157 million in current liabilities (2013 - $154 million).