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Pensions and other postretirement benefits (Details 1) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]    
Policy 100.00%  
Actual asset allocation 100.00% 100.00%
Expected going concern basis excess (deficit) funded status CAD 2,500.0  
Expected solvency basis excesss (deficit) funded status 100.0  
Going concern basis excess (deficit) funded status   CAD 2,200.0
Solvency basis excesss (deficit) funded status   CAD 300.0
Cash contribution to pension plan, expected to be 115.0  
Actual contributions for all pension plans contributed in next fiscal year CAD 60.0  
Cash and short-term investments    
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]    
Policy 3.00%  
Actual asset allocation 3.00% 2.00%
Bonds and mortgages    
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]    
Policy 40.00%  
Actual asset allocation 33.00% 30.00%
Percentage of bonds guaranteed by governments and corporate entities (in hundredths) 66.00% 74.00%
Private debt    
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]    
Policy 0.00%  
Actual asset allocation 1.00% 1.00%
Equities    
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]    
Policy 42.00%  
Actual asset allocation 38.00% 41.00%
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) 21.00% 22.00%
Real Estate [Member]    
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]    
Policy 4.00%  
Actual asset allocation 2.00% 2.00%
Oil and gas    
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]    
Policy 7.00%  
Actual asset allocation 6.00% 5.00%
Infrastructure    
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]    
Policy 4.00%  
Actual asset allocation 5.00% 5.00%
Absolute Return [Member]    
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]    
Policy 0.00%  
Actual asset allocation 10.00% 11.00%
Risk-based allocation    
Defined Benefit Plan Fair Value Of Investments Disclosure [Line Items]    
Policy 0.00%  
Actual asset allocation 2.00% 3.00%