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Employee Benefit Plans (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
US_Retirees_And_Spouses
US_Employees
Dec. 31, 2010
Dec. 31, 2009
Employee Benefit Plans (Textual) [Abstract]      
Expenses for defined-contribution plans $ 54 $ 41 $ 39
Number of U.S. employees participate in defined benefit health care plans 232    
Number of U.S. retirees and spouses participate in defined benefit health care plans 1,053    
Net periodic benefit cost 14 10 12
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 30    
Expected years of Defined Benefit Plans. 5 years    
Expected future benefit amounts to pay, total $ 308