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Other income (expense) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Other income (expense)      
Investment and interest income $ 85 $ 86 $ 98
Foreign exchange gains (losses) 21 (55) 184
License fee income 80 54 49
Gains (losses) on sale of securities and affiliated companies 17 9 (2)
Impairment of available-for-sale securities (5) (3) (12)
Miscellaneous income (loss) (230) 39 64
Other income (expense) (32) 130 381
Forward starting swap costs included in Miscellaneous income (loss) (149)    
Bridge financing costs $ 54