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Trading Securities, at Fair Value (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Schedule of Trading Securities and Other Trading Assets [Line Items] | |||
| Trading Securities, Cost | $ 1,000,000,000 | $ 200,000,000 | |
| Trading Securities | 1,003,301,000 | 199,523,000 | |
| Trading Securities, Gross Unrealized Gain (Loss) | 3,100,000 | (500,000) | |
| Proceeds from sales of trading securities | 1,222,959,000 | 58,516,000 | 0 |
| Trading Securities, Amortized Cost Sold | 1,200,000,000 | 58,200,000 | |
| Trading Securities, Realized Gain (Loss) | 3,300,000 | 300,000 | |
| Trading Securities, Change in Unrealized Holding Gain (Loss) | $ 3,500,000 | $ (500,000) | |
| X | ||||||||||
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- Definition
The cash inflow associated with sale of trading securities. No definition available.
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| X | ||||||||||
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- Definition
The total amount of amortized cost of trading securities sold during the reporting period. No definition available.
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- Definition
The net amount of gross unrealized gains (losses) for trading securities, at a point in time. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This item represents a parenthetical disclosure for the cost of securities classified as trading. No definition available.
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- Definition
This item represents the gain (loss) realized during the period from the sale of trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of trading securities held at each balance sheet date, that was included in earnings for the period. Trading securities are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) and the change in net unrealized holding gain (loss) is included in earnings for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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