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Presentation - Venezuelan Operations (Details)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Dec. 31, 2011
VENEZUELA
USD ($)
Dec. 31, 2011
VENEZUELA
VEB
Dec. 31, 2010
VENEZUELA
USD ($)
Monetary Assets, Net         $ 311   $ 41
Cash and Cash Equivalents, at Carrying Value 17,148 14,805 20,894 21,804 331   132
Foreign Currency Spot Exchange Rate           4.3  
Impact from 50% change in the official bolivar exchange rate         50.00%    
Foreign currency translation loss that would occur from a 50% change in the official bolivar exchange rate         $ 100