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Pensions and other postretirement benefits (Details 1)
CAD in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
CAD
Dec. 31, 2014
CAD
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]        
Actual asset allocation 100.00% 100.00% 100.00% 100.00%
Expected going concern basis excess (deficit) funded status CAD 2,300      
Expected solvency basis excesss (deficit) funded status 200      
Going concern basis excess (deficit) funded status 1,900      
Solvency basis excesss (deficit) funded status 700      
Cash contribution to pension plan, expected to be 115      
Actual contributions for all pension plans contributed in next fiscal year CAD 60      
Policy 100.00%      
Percentage of plan assets denominated in European currencies 8.00%      
Percentage of plan assets denominated in other currencies 8.00%      
CAD        
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]        
Percentage of plan assets denominated in foreign currency 66.00%      
Debt instrument, face amount CAD 9,245 CAD 7,973    
USD        
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]        
Percentage of plan assets denominated in foreign currency 13.00%      
Debt instrument, face amount | $     $ 6,680 $ 6,873
JPY        
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]        
Percentage of plan assets denominated in foreign currency 5.00%      
Cash and short-term investments        
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]        
Actual asset allocation 2.00% 3.00% 2.00% 3.00%
Policy 3.00%      
Bonds and mortgages        
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]        
Actual asset allocation 30.00% 29.00% 30.00% 29.00%
Policy 37.00%      
Percentage of bonds guaranteed by governments and corporate entities (in hundredths) 74.00% 82.00%    
Equities        
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]        
Actual asset allocation 40.00% 39.00% 40.00% 39.00%
Policy 45.00%      
Maximum percentage of equity investments allocated to an individual issuer (in hundredths) 2.00% 2.00%    
Maximum percentage of equity investments allocated to an industry sector (in hundredths) 22.00% 23.00%    
Real Estate [Member]        
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]        
Actual asset allocation 2.00% 2.00% 2.00% 2.00%
Policy 4.00%      
Oil and gas        
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]        
Actual asset allocation 5.00% 8.00% 5.00% 8.00%
Policy 7.00%      
Infrastructure        
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]        
Actual asset allocation 7.00% 5.00% 7.00% 5.00%
Policy 4.00%      
Absolute Return [Member]        
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]        
Actual asset allocation 11.00% 10.00% 11.00% 10.00%
Policy 0.00%      
Risk-based allocation        
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]        
Actual asset allocation 3.00% 4.00% 3.00% 4.00%
Policy 0.00%