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Discontinued Operations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Discontinued Operations, Disposed Venezuelan Subsidiaries
Dec. 31, 2010
Discontinued Operations, Disposed Venezuelan Subsidiaries
item
Subsidiaries        
Number of subsidiaries       2
Special termination benefits $ 8      
Loss from discontinued operations 10 1    
Ongoing costs related to the expropriation     $ 2