Goodwill and Intangible Assets (Details) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill
Beginning Balance	CAD 164	CAD 150
Amortization	0	0
Foreign exchange impact	31	14
Additions	3
Ending Balance	198	164
Intangible assets
Cost, Beginning Balance	22	22
Accumulated amortization, Beginning Balance	(10)	(10)
Net carrying amounts, Beginning balance	12	12
Amortization	(1)	(1)
Foreign exchange impact	2	1
Cost, Ending Balance	22	22
Accumulated amortization, Ending Balance	(9)	(10)
Net carrying amounts, Ending balance	13	12
Total goodwill and intangible assets
Beginning Balance	176	162
Amortization	(1)	(1)
Foreign exchange impact	33	15
Additions	3
Ending Balance	CAD 211	CAD 176