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Pre-tax Net Changes in Projected Benefit Obligations Recognized in Other Comprehensive Income (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Total recognized in other comprehensive expense (income) $ (7) $ (12) $ 2
Pension Benefit Obligations
      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) arising during the year 7 (1)  
Amortization of (gain) loss included in net periodic benefit cost (1) (1)  
Recognition of loss due to settlement (1) (3)  
Foreign currency exchange 0 1  
Total recognized in other comprehensive expense (income) 5 (4)  
Postemployment Benefit Obligations
      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) arising during the year (12) (7)  
Amortization of (gain) loss included in net periodic benefit cost 0 0  
Recognition of loss due to settlement 0 0  
Foreign currency exchange 0 0  
Total recognized in other comprehensive expense (income) $ (12) $ (7)