Commitments (Details)	9 Months Ended
	Sep. 30, 2014
Heavy Oil [Member]
Commitments and Contingencies Disclosure [Line Items]
Notional amount, per day	4,000
Underlying derivative (Cdn $ per barrel)	53.63
October through December 2014 Deliveries [Member] | Natural Gas [Member]
Commitments and Contingencies Disclosure [Line Items]
Notional amount, per day	110
Underlying derivative (Cdn $ per barrel)	4.04
2015 Deliveries [Member] | Natural Gas [Member]
Commitments and Contingencies Disclosure [Line Items]
Notional amount, per day	65
Underlying derivative (Cdn $ per barrel)	4.13
2016 Deliveries [Member] | Natural Gas [Member]
Commitments and Contingencies Disclosure [Line Items]
Notional amount, per day	10