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Schedule of Pension and Postemployment Benefit Costs (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension Benefit Costs
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 9 $ 9 $ 8
Interest cost 4 4 4
Expected return on plan assets (3) (3) (3)
Settlement charge 1 3 0
Employee contributions (1) (1) (1)
Amortization of actuarial loss 1 1 1
Total costs 11 13 9
Postemployment Benefit Costs
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 4 4 4
Interest cost 1 2 2
Expected return on plan assets 0 0 0
Settlement charge 0 0 0
Employee contributions 0 0 0
Amortization of actuarial loss 0 0 0
Total costs $ 5 $ 6 $ 6