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Financial Guaranty Contracts Accounted for as Credit Derivatives (Details 2) (USD $)
3 Months Ended6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding$ 98,005,000,000 $ 98,005,000,000 $ 109,771,000,000
Percentage of total (as a percent)100.00% 100.00% 100.00%
Net change in unrealized gains (losses)(54,059,000)35,115,000(325,695,000)287,213,000 
Super senior.
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding27,321,000,000 27,321,000,000 29,344,000,000
Percentage of total (as a percent)27.90% 27.90% 26.70%
AAA.
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding44,074,000,000 44,074,000,000 50,214,000,000
Percentage of total (as a percent)45.00% 45.00% 45.70%
AA.
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding6,392,000,000 6,392,000,000 8,138,000,000
Percentage of total (as a percent)6.50% 6.50% 7.40%
A
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding6,506,000,000 6,506,000,000 7,405,000,000
Percentage of total (as a percent)6.60% 6.60% 6.70%
BBB
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding5,276,000,000 5,276,000,000 6,312,000,000
Percentage of total (as a percent)5.40% 5.40% 5.80%
Below investment grade ("BIG")
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding8,436,000,000 8,436,000,000 8,358,000,000
Percentage of total (as a percent)8.60% 8.60% 7.70%
U.S. RMBS
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding9,147,000,000 9,147,000,000 9,776,000,000
Original Subordination (as a percent)23.90% 23.90% 23.10%
Current Subordination (as a percent)32.60% 32.60% 32.40%
Net change in unrealized gains (losses)(51,100,000)800,000(341,900,000)174,900,000 
U.S. RMBS | 2004 and Prior
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding155,000,000 155,000,000  
Original Subordination (as a percent)6.20% 6.20%  
Current Subordination (as a percent)19.30% 19.30%  
Net change in unrealized gains (losses)300,000 (3,000,000)  
U.S. RMBS | 2005
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding2,709,000,000 2,709,000,000  
Original Subordination (as a percent)30.30% 30.30%  
Current Subordination (as a percent)64.00% 64.00%  
Net change in unrealized gains (losses)1,900,000 (17,200,000)  
U.S. RMBS | 2006
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding1,693,000,000 1,693,000,000  
Original Subordination (as a percent)29.10% 29.10%  
Current Subordination (as a percent)35.40% 35.40%  
Net change in unrealized gains (losses)(60,300,000) (101,000,000)  
U.S. RMBS | 2007
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding4,590,000,000 4,590,000,000  
Original Subordination (as a percent)18.60% 18.60%  
Current Subordination (as a percent)12.70% 12.70%  
Net change in unrealized gains (losses)7,000,000 (220,700,000)  
CMBS
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding4,517,000,000 4,517,000,000 6,751,000,000
Original Subordination (as a percent)33.80% 33.80% 29.80%
Current Subordination (as a percent)39.40% 39.40% 31.30%
Net change in unrealized gains (losses)9,800,000300,00010,500,0009,800,000 
CMBS | 2004 and Prior
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding241,000,000 241,000,000  
Original Subordination (as a percent)29.60% 29.60%  
Current Subordination (as a percent)56.80% 56.80%  
Net change in unrealized gains (losses)(100,000) (200,000)  
CMBS | 2005
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding677,000,000 677,000,000  
Original Subordination (as a percent)17.80% 17.80%  
Current Subordination (as a percent)26.40% 26.40%  
CMBS | 2006
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding2,184,000,000 2,184,000,000  
Original Subordination (as a percent)33.50% 33.50%  
Current Subordination (as a percent)38.70% 38.70%  
Net change in unrealized gains (losses)10,300,000 10,900,000  
CMBS | 2007
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding1,415,000,000 1,415,000,000  
Original Subordination (as a percent)42.60% 42.60%  
Current Subordination (as a percent)43.60% 43.60%  
Net change in unrealized gains (losses)$ (400,000) $ (200,000)