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INVESTMENTS (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Trading Securities      
Trading securities, net unrealized gains (losses) $ 19 $ (5) $ (3)
Marketable securities 184 138  
Other assets 82 73  
Trading Securities $ 266 $ 211