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Financial instruments (Details 1)
$ in Millions
12 Months Ended
Dec. 31, 2015
CAD
Dec. 31, 2014
CAD
Dec. 31, 2013
CAD
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2012
CAD
Interest rate derivatives [Abstract]            
Accumulated other comprehensive income (loss), unamortized gain (loss) relating to treasury stock, after tax CAD (2,406,000,000) CAD (2,961,000,000) CAD (2,040,000,000)     CAD (3,861,000,000)
Derivative instruments [Member]            
Interest rate derivatives [Abstract]            
Accumulated other comprehensive income (loss), unamortized gain (loss) relating to treasury stock, after tax 7,000,000 7,000,000 8,000,000     CAD 8,000,000
Foreign Exchange Forward [Member]            
Foreign currency derivatives [Abstract]            
Gain on foreign exchange forward contracts net pretax 61,000,000 9,000,000 CAD 6,000,000      
Unrealized gain on foreign exchange forward contracts 4,000,000 9,000,000        
Unrealized loss on foreign exchange forward contracts CAD 2,000,000 CAD 0        
Foreign Exchange Forward [Member] | USD            
Foreign currency derivatives [Abstract]            
Foreign exchange forward contracts notional amount | $       $ 361 $ 350