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Discontinued Operations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 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 3 1 13 2    
Ongoing costs related to the expropriation         $ 5