Presentation - Venezuelan Operations (Details) In Millions, unless otherwise specified					3 Months Ended
	Jun. 30, 2012 USD ($)	Dec. 31, 2011 USD ($)	Jun. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)	Jun. 30, 2012 VENEZUELA USD ($)	Jun. 30, 2012 VENEZUELA VEB	Dec. 31, 2011 VENEZUELA USD ($)
Net monetary assets					$ 460		$ 301
Cash and cash equivalents included in net monetary assets	15,101	17,148	17,472	14,805	542		331
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					$ 150