Business Segments (Parenthetical) (Detail) (CAD) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Operating revenues	32,722	[1],[2],[3]	31,053	[1],[2],[3]	30,474	[1],[2],[3]
Write-down of refinery plant and equipment reported as depreciation and depletion expenses	245
Decommissioning, environmental and employee-related costs reported as production and manufacturing expenses	132
Amount incurred related to decommissioning, environmental and employee related cost	40
Property plant and equipment under construction	9,234		13,846
Goodwill	224		204
Pre Tax
Segment Reporting Information [Line Items]
Charges related to conversion of refinery to terminal	377
After Tax
Segment Reporting Information [Line Items]
Charges related to conversion of refinery to terminal	280
United States Exports
Segment Reporting Information [Line Items]
Operating revenues	5,217		4,358		4,175
Upstream
Segment Reporting Information [Line Items]
Operating revenues	6,016	[3]	4,674	[3]	5,278	[3]
Goodwill	20

[1] Operating revenues include federal excise tax of $1,423 million (2012 - $1,338 million, 2011 - $1,320 million).

[2] Operating revenues include amounts from related parties of $2,385 million (2012 - $2,907 million, 2011 - $2,818 million), (note 16).

[3] Includes export sales to the United States of $5,217 million (2012 - $4,358 million, 2011 - $4,175 million). Export sales to the United States were recorded in all operating segments, with the largest effects in the Upstream segment.