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Post-Retirement and Other Long-Term Employees Benefits - Changes in Benefit Obligation and Plan Assets (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Change in plan assets:      
Plan assets at fair value at beginning of year $ 378    
Employer contributions 34 30  
Plan assets at fair value at end of year 422 378  
Net amount recognized in the balance sheet consisted of the following:      
Non-current assets 5 1  
Long-term liabilities (477) (409)  
Unrealized gain (loss) on defined benefit pension plans [Member]
      
Change in benefit obligation:      
Benefit obligation at beginning of year 794 701  
Service cost 40 34 25
Interest cost 31 33 26
Employee contributions 6 7  
Benefits paid (21) (20)  
Effect of settlement (31) (18)  
Actuarial (gain) loss 58 73  
Transfer in 70 3  
Transfer out (70) (3)  
Plan amendment 4    
Foreign currency translation adjustment 20 (16)  
Benefit obligation at end of year 901 794 701
Change in plan assets:      
Plan assets at fair value at beginning of year 378 372  
Expected return on plan assets 18 20 18
Employer contributions 34 30  
Employee contributions 6 7  
Benefits paid (11) (8)  
Effect of settlement (30) (16)  
Actuarial gain (loss) 17 (25)  
Transfer in 40 1  
Transfer out (40) (1)  
Foreign currency translation adjustments 10 (2)  
Plan assets at fair value at end of year 422 378 372
Funded status (479) (416)  
Net amount recognized in the balance sheet consisted of the following:      
Non-current assets 5 1  
Current liabilities (16) (16)  
Long-term liabilities (468) (401)  
Net amount recognized (479) (416)  
Other Pension Plans, Defined Benefit [Member]
      
Change in benefit obligation:      
Benefit obligation at beginning of year 52 50  
Service cost 9 8 8
Interest cost 3 3 2
Benefits paid (3) (2)  
Actuarial (gain) loss 2 (5)  
Transfer in 3 1  
Transfer out (3) (1)  
Foreign currency translation adjustment   (2)  
Benefit obligation at end of year 63 52 50
Change in plan assets:      
Funded status (63) (52)  
Net amount recognized in the balance sheet consisted of the following:      
Current liabilities (3) (3)  
Long-term liabilities (60) (49)  
Net amount recognized $ (63) $ (52)