Quarterly report pursuant to Section 13 or 15(d)

Investments (Details)

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Investments (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Trading Securities    
Trading securities, net unrealized (gains) losses $ 13 $ 3
Marketable Securities 125 132
Other Assets 73 77
Total trading securities $ 198 $ 209