Annual report pursuant to Section 13 and 15(d)

Asset Allocation Ranges and Actual Allocation, USRIP (Detail)

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Asset Allocation Ranges and Actual Allocation, USRIP (Detail) (U.S. Retirement Income Plan, or USRIP)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Large-Cap Equity
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 10.00%  
Range maximum 35.00%  
Actual 13.90% 16.60%
Small- and Mid-Cap Equity
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 0.00%  
Range maximum 15.00%  
Actual 1.30% 5.20%
International Equity
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 10.00%  
Range maximum 30.00%  
Actual 10.70% 13.70%
Private Equity
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 2.00%  
Range maximum 10.00%  
Actual 6.20% 6.10%
Hedge Funds
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 10.00%  
Range maximum 30.00%  
Actual 17.30% 18.00%
Real Assets
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 2.00%  
Range maximum 10.00%  
Actual 5.20% 6.30%
Fixed Income
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 15.00%  
Range maximum 40.00%  
Actual 34.80% 33.10%
Cash
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 0.00%  
Range maximum 15.00%  
Actual 10.60% 1.00%