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Post-Retirement and Other Long-Term Employees Benefits - Components of Net Periodic Benefit Cost (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Unrealized gain (loss) on defined benefit pension plans [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 40 $ 34 $ 25
Interest cost 31 33 26
Expected return on plan assets (18) (20) (18)
Amortization of actuarial net loss (gain) 12 6 4
Amortization of prior service cost 5 1 1
Effect of settlement   (1) 5
Effect of curtailment     (2)
Net periodic benefit cost 70 53 41
Other Pension Plans, Defined Benefit [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 9 8 8
Interest cost 3 3 2
Amortization of actuarial net loss (gain) 2 (5) 3
Amortization of prior service cost     1
Effect of curtailment     (1)
Net periodic benefit cost $ 14 $ 6 $ 13