Contingencies - Legal Proceedings (Details) CAD in Millions						6 Months Ended
	Jul. 11, 2016 CAD claim	Jul. 05, 2016 CAD	Jul. 04, 2016 CAD claim	Apr. 12, 2016 CAD	Jul. 06, 2015 CAD	Jun. 30, 2016 CAD claim
Claimed loss or damages as a result of derailment [Member]
Commitments and Contingencies Disclosure [Line Items]
Settlement amounts						CAD 440
Number of notices for claims of damage to cargo | claim						2
Province of Quebec [Member] | Lac-Megantic Rail Accident [Member]
Commitments and Contingencies Disclosure [Line Items]
Value of damages sought					CAD 409
The “WD Trustee” [Member] | Lac-Megantic Rail Accident [Member] | Lost Lading Loss Recovery [Member]
Commitments and Contingencies Disclosure [Line Items]
Value of damages sought				CAD 6
Subsequent Event [Member] | Quebec Minister of Sustainable Development and Environment [Member] | Lac-Megantic Rail Accident [Member]
Commitments and Contingencies Disclosure [Line Items]
Value of damages sought		CAD 95
Subsequent Event [Member] | Initial 8 Insurers [Member] | Lac-Megantic Rail Accident [Member] | Subrogated Insurance Claim [Member]
Commitments and Contingencies Disclosure [Line Items]
Value of damages sought			CAD 16
Number of notices for claims of damage to cargo | claim			8
Subsequent Event [Member] | Additional 2 Insurers [Member] | Lac-Megantic Rail Accident [Member] | Subrogated Insurance Claim [Member]
Commitments and Contingencies Disclosure [Line Items]
Value of damages sought	CAD 3
Number of notices for claims of damage to cargo | claim	2
World Fuel Entities [Member] | Lac-Megantic Rail Accident [Member]
Commitments and Contingencies Disclosure [Line Items]
Settlement amounts				110
Irving Oil [Member] | MMA Bankruptcy Estate [Member] | Lac-Megantic Rail Accident [Member]
Commitments and Contingencies Disclosure [Line Items]
Settlement amounts				CAD 60