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Schedule of Pension and Postemployment Benefit Costs (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Benefit Costs
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 10 $ 9 $ 9
Interest cost 3 4 4
Expected return on plan assets (2) (3) (3)
Settlement charge 1 1 3
Employee contributions (1) (1) (1)
Amortization of actuarial loss (gain) 2 1 1
Total costs 13 11 13
Postemployment Benefit Costs
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 3 4 4
Interest cost 1 1 2
Expected return on plan assets 0 0 0
Settlement charge 0 0 0
Employee contributions 0 0 0
Amortization of actuarial loss (gain) (1) 0 0
Total costs $ 3 $ 5 $ 6