| http://www.w3.org/ns/prov#value | - As of December 31, 2011, marketable securities of $250 million were included in prepaid expenses and other current assets and $223 million were included in other non-current assets in the condensed consolidated statements of financial position.Derivative Financial Instruments and Hedging ActivitiesThe notional values of our derivative portfolio, which at March 31, 2012, and December 31, 2011, cons
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