Annual report pursuant to Section 13 and 15(d)

Asset Allocation Ranges and Actual Allocation, CRIP (Detail)

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Asset Allocation Ranges and Actual Allocation, CRIP (Detail) (Canadian Retirement Income Plan, or CRIP)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Canadian Equities
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 25.00%  
Range maximum 50.00%  
Actual 34.80% 35.30%
U.S. Equities
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 0.00%  
Range maximum 19.00%  
Actual 5.20% 4.90%
International Equities
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 0.00%  
Range maximum 19.00%  
Actual 8.90% 8.90%
Fixed Income
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 30.00%  
Range maximum 70.00%  
Actual 50.50% 50.30%
Money Market
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 0.00%  
Range maximum 10.00%  
Actual 0.60% 0.60%