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Net Interest and Other Financial Costs - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Mar. 27, 2013
2014 Senior Convertible Notes
Sep. 30, 2013
2014 Senior Convertible Notes
Sep. 30, 2012
Senior Notes Due Twenty Thirteen [Member]
Sep. 30, 2012
Senior Notes Due Twenty Thirteen [Member]
Interest Expense [Line Items]                
Net foreign currency remeasurement gains/losses $ 3 $ 6 $ 9 $ 2        
Charge for guarantee in unconsolidated equity method investment during the period 22   22          
Charge associated with repurchases/redemptions of senior notes           34 18 18
Repurchased face amount of senior notes         $ 542 $ 542 $ 300 $ 300
Senior notes stated interest rate           4.00%    
Debt instrument, due date           May 15, 2014   Jun. 01, 2013