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Financial Guaranty Contracts Accounted for as Credit Derivatives (Details 2) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding$ 90,704,000,000 $ 90,704,000,000 $ 109,771,000,000
Percentage of total (as a percent)100.00% 100.00% 100.00%
Net change in unrealized gains (losses)1,155,531,000(276,427,000)829,836,00010,786,000 
Super senior
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding23,744,000,000 23,744,000,000 29,344,000,000
Percentage of total (as a percent)26.20% 26.20% 26.70%
AAA.
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding43,350,000,000 43,350,000,000 50,214,000,000
Percentage of total (as a percent)47.80% 47.80% 45.70%
AA.
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding4,361,000,000 4,361,000,000 8,138,000,000
Percentage of total (as a percent)4.80% 4.80% 7.40%
A
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding6,312,000,000 6,312,000,000 7,405,000,000
Percentage of total (as a percent)7.00% 7.00% 6.70%
BBB
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding4,784,000,000 4,784,000,000 6,312,000,000
Percentage of total (as a percent)5.20% 5.20% 5.80%
Below investment grade ("BIG")
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding8,153,000,000 8,153,000,000 8,358,000,000
Percentage of total (as a percent)9.00% 9.00% 7.70%
U.S. RMBS
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding8,858,000,000 8,858,000,000 9,776,000,000
Original Subordination (as a percent)24.00% 24.00% 23.10%
Current Subordination (as a percent)31.70% 31.70% 32.40%
Net change in unrealized gains (losses)999,600,000(228,800,000)657,700,000(53,900,000) 
U.S. RMBS | 2004 and Prior
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding149,000,000 149,000,000  
Original Subordination (as a percent)6.20% 6.20%  
Current Subordination (as a percent)19.40% 19.40%  
Net change in unrealized gains (losses)2,500,000 (500,000)  
U.S. RMBS | 2005
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding2,623,000,000 2,623,000,000  
Original Subordination (as a percent)30.40% 30.40%  
Current Subordination (as a percent)64.50% 64.50%  
Net change in unrealized gains (losses)14,100,000 (3,100,000)  
U.S. RMBS | 2006
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding1,660,000,000 1,660,000,000  
Original Subordination (as a percent)29.30% 29.30%  
Current Subordination (as a percent)35.40% 35.40%  
Net change in unrealized gains (losses)104,000,000 3,000,000  
U.S. RMBS | 2007
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding4,426,000,000 4,426,000,000  
Original Subordination (as a percent)18.60% 18.60%  
Current Subordination (as a percent)10.50% 10.50%  
Net change in unrealized gains (losses)879,000,000 658,300,000  
CMBS
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding4,480,000,000 4,480,000,000 6,751,000,000
Original Subordination (as a percent)33.90% 33.90% 29.80%
Current Subordination (as a percent)40.10% 40.10% 31.30%
Net change in unrealized gains (losses)(200,000)400,00010,300,00010,200,000 
CMBS | 2004 and Prior
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding211,000,000 211,000,000  
Original Subordination (as a percent)29.80% 29.80%  
Current Subordination (as a percent)57.40% 57.40%  
Net change in unrealized gains (losses)200,000    
CMBS | 2005
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding676,000,000 676,000,000  
Original Subordination (as a percent)17.80% 17.80%  
Current Subordination (as a percent)31.20% 31.20%  
Net change in unrealized gains (losses)(100,000) (100,000)  
CMBS | 2006
     
Distribution of Credit Derivative Net Par Outstanding     
Net Par Outstanding2,178,000,000 2,178,000,000  
Original Subordination (as a percent)33.60% 33.60%  
Current Subordination (as a percent)38.80% 38.80%  
Net change in unrealized gains (losses)700,000 11,600,000  
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)43.80% 43.80%  
Net change in unrealized gains (losses)$ (1,000,000) $ (1,200,000)