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Employee Benefit Plans - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Employees
Dec. 31, 2011
Dec. 31, 2010
Expenses for defined-contribution plans $ 82 $ 54 $ 41
Number of U.S retirees and spouses participate in defined benefit health care plans 1,105    
Number of U.S. employees participate in defined benefit health care plans 232    
Net periodic benefit cost 10 14 10
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 32    
Expected years of Defined Benefit Plans. 5 years    
Expected future benefit amounts to pay, total $ 326