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LMIMCo's investment policies restrict the use of derivatives to either establish long exposures for purposes of expediency or capital efficiency, or to hedge risks to the extent of a plan's current exposure to such risks. Most derivative transactions are settled on a daily basis. 2 U.S. equity securities included shares of our issued and outstanding common stock purchased by investment managers in the amounts of $7 million (less than .03% of plan assets) as of December 31, 2009. 289Postretirement Benefit Plans (Schedule of Qualified Defined Benefit Pension Plans and Retiree Medical and Life Insurance Plans by Asset Category) (Details) (USD $)MillionsUnKnownUnKnownUnKnowntruetrue