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Financial Instruments Currency losses - total (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Currency losses [Abstract]        
Currency Losses Net $ 0 $ 0 $ 0 $ 1