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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, 2012
Dec. 31, 2011
Large-Cap Equity
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 10.00%  
Range maximum 35.00%  
Actual 19.10% 13.90%
Small- and Mid-Cap Equity
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 0.00%  
Range maximum 15.00%  
Actual 4.00% 1.30%
International Equity
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 10.00%  
Range maximum 30.00%  
Actual 16.70% 10.70%
Private Equity
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 2.00%  
Range maximum 10.00%  
Actual 7.30% 6.20%
Hedge Funds
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 10.00%  
Range maximum 30.00%  
Actual 18.00% 17.30%
Real Assets
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 2.00%  
Range maximum 10.00%  
Actual 5.90% 5.20%
Fixed Income
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 15.00%  
Range maximum 40.00%  
Actual 27.50% 34.80%
Cash
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 0.00%  
Range maximum 15.00%  
Actual 1.50% 10.60%