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Available-for-Sale Securities, at Fair Value Schedule of Realized Gain (Loss) (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 Available-for-sale Securities [Line Items] | |||
| Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds | $ 1,000,000,000 | $ 415,800,000 | |
| Available-for-sale Securities, Gross Realized Gains | 29,983,000 | 6,607,000 | 336,000 |
| Available-for-sale Securities, Gross Realized Losses | (316,000) | (332,000) | 0 |
| Available-for-sale Securities, Gross Realized Gain (Loss) | 29,667,000 | 6,275,000 | 336,000 |
| Available-for-sale Securities, Gross Realized Gains (Losses), Amortized Cost Sold | 1,000,000,000 | 409,500,000 | |
| U.S. Treasuries, Gross Realized Gains (Losses), Amortized Cost Sold | $ 295,800,000 | ||
| X | ||||||||||
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- Definition
The total amount of amortized cost of securities, categorized neither as held-to-maturity nor trading securities, sold during the reporting period. No definition available.
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- Definition
The total amount of amortized cost of U.S. Treasury securities sold during the reporting period. No definition available.
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- Definition
This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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