Quarterly report pursuant to Section 13 or 15(d)

Trading Securities, at Fair Value (Details)

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Trading Securities, at Fair Value (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Trading Securities, Cost $ 1,000,000,000 $ 1,000,000,000   $ 1,000,000,000
Trading Securities 999,375,000 999,375,000   1,003,301,000
Trading Securities, Gross Unrealized Gain (Loss) 3,000,000 3,000,000   3,100,000
Proceeds from sales of trading securities   1,001,904,000 500,133,000  
Trading Securities, Amortized Cost Sold   1,000,000,000    
Trading Securities, Realized Gain (Loss)   1,700,000    
Trading Securities, Change in Unrealized Holding Gain (Loss) $ 1,200,000 $ (100,000)