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Other Income (Expense), Net (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
Other, net        
Income from cash and cash investments $ 2 $ 1 $ 4 $ 3
Income from financial investments, net 2 33 18 50
Impairment of financial investments, net (2)   (2)  
Other items, net   (2) (3)  
Total other, net 2 32 17 53
Other Income (Expense), Net (Textual) [Abstract]        
Currency gains (losses) included in other items , net $ 0 $ 3 $ 1 $ 1