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Segment Information (Details 2) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Assets      
Total assets: $ 8,517 $ 8,598 $ 9,161
Reportable Segment Totals
     
Assets      
Total assets: 8,225 8,360 8,883
Europe
     
Assets      
Total assets: 3,263 3,362 3,744
North America
     
Assets      
Total assets: 2,030 1,994 2,056
South America
     
Assets      
Total assets: 1,638 1,655 1,724
Asia Pacific
     
Assets      
Total assets: 1,294 1,349 1,359
Other
     
Assets      
Total assets: $ 292 $ 238 $ 278