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Outstanding Exposure (Details 2) (USD $)
9 Months Ended
Sep. 30, 2011
risk
Y
Dec. 31, 2010
risk
Outstanding Exposure  
Net Par Outstanding$ 571,725,000,000$ 617,131,000,000
% of Total Net Par Outstanding (as a percent)100.00%100.00%
Net Par Outstanding Credit Derivatives90,704,000,000109,771,000,000
RMBS
  
Outstanding Exposure  
Minimum par of assumed credits1,000,000 
Net par outstanding of transactions covered by the Bank of America Agreement4,200,000,000 
Percentage of Assured Guaranty's total below-investment-grade ("BIG") RMBS net par outstanding covered by the Bank of America Agreement (as a percent)28.00% 
U.S. RMBS
  
Outstanding Exposure  
Net Par Outstanding22,464,000,00025,130,000,000
U.S. RMBS | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding15,267,000,00016,355,000,000
% of Total Net Par Outstanding (as a percent)2.70%2.60%
U.S. RMBS | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding2,628,000,0002,252,000,000
U.S. RMBS | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding6,327,000,0008,528,000,000
U.S. RMBS | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding6,312,000,0005,575,000,000
Prime first lien
  
Outstanding Exposure  
Net Par Outstanding760,000,000849,000,000
Prime first lien | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding603,000,000624,000,000
% of Total Net Par Outstanding (as a percent)0.10%0.10%
Prime first lien | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding90,000,00082,000,000
Prime first lien | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding513,000,000542,000,000
Alt-A first lien
  
Outstanding Exposure  
Net Par Outstanding5,541,000,0006,134,000,000
Alt-A first lien | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding4,842,000,0004,657,000,000
% of Total Net Par Outstanding (as a percent)0.90%0.80%
Alt-A first lien | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding1,815,000,000976,000,000
Alt-A first lien | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding1,594,000,0003,108,000,000
Alt-A first lien | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding1,433,000,000573,000,000
Option ARM
  
Outstanding Exposure  
Net Par Outstanding2,627,000,0003,214,000,000
Option ARM | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding2,387,000,0002,859,000,000
% of Total Net Par Outstanding (as a percent)0.40%0.50%
Option ARM | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding124,000,00033,000,000
Option ARM | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding1,115,000,0002,186,000,000
Option ARM | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding1,148,000,000640,000,000
Subprime
  
Outstanding Exposure  
Net Par Outstanding8,403,000,0009,039,000,000
Subprime | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding2,970,000,0003,083,000,000
% of Total Net Par Outstanding (as a percent)0.50%0.40%
Subprime | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding153,000,000729,000,000
Subprime | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding2,608,000,0002,248,000,000
Subprime | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding209,000,000106,000,000
CES
  
Outstanding Exposure  
Net Par Outstanding1,061,000,0001,164,000,000
CES | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding1,035,000,0001,131,000,000
% of Total Net Par Outstanding (as a percent)0.20%0.20%
CES | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding 63,000,000
CES | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding497,000,000444,000,000
CES | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding538,000,000624,000,000
HELOCs
  
Outstanding Exposure  
Net Par Outstanding4,072,000,0004,730,000,000
HELOCs | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding3,430,000,0004,001,000,000
% of Total Net Par Outstanding (as a percent)0.60%0.60%
HELOCs | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding446,000,000369,000,000
HELOCs | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding2,984,000,0003,632,000,000
TruPS
  
Outstanding Exposure  
Net Par Outstanding6,467,000,0006,833,000,000
TruPS | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding3,184,000,0002,810,000,000
% of Total Net Par Outstanding (as a percent)0.60%0.50%
TruPS | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding2,232,000,0001,846,000,000
TruPS | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding952,000,000964,000,000
Other structured finance
  
Outstanding Exposure  
Net Par Outstanding95,462,000,000117,429,000,000
Other structured finance | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding3,360,000,0002,687,000,000
% of Total Net Par Outstanding (as a percent)0.60%0.40%
Other structured finance | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding1,483,000,000841,000,000
Other structured finance | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding423,000,000363,000,000
Other structured finance | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding1,454,000,0001,483,000,000
Public finance
  
Outstanding Exposure  
Net Par Outstanding447,332,000,000467,739,000,000
Public finance | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding5,416,000,0004,954,000,000
% of Total Net Par Outstanding (as a percent)0.90%0.80%
Public finance | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding4,216,000,0003,752,000,000
Public finance | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding339,000,000283,000,000
Public finance | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding861,000,000919,000,000
Total first lien
  
Outstanding Exposure  
Net par outstanding of transactions covered by the Bank of America Agreement1,900,000,000 
Percentage of Assured Guaranty's total below-investment-grade ("BIG") RMBS net par outstanding covered by the Bank of America Agreement (as a percent)17.00% 
Loss sharing agreement (as a percent)80.00% 
Maximum aggregate collateral losses6,600,000,000 
Below investment grade ("BIG")
  
Outstanding Exposure  
Probability of paying more claims than being reimbursedmore than 50% 
Constant discount rate (as a percent)5.00% 
Maximum period of liquidity claims (in years)1 
Net Par Outstanding27,227,000,00026,806,000,000
% of Total Net Par Outstanding (as a percent)4.80%4.30%
Net Par Outstanding Financial Guaranty Insurance16,278,000,00016,214,000,000
Net par outstanding FG VIE2,796,000,0002,234,000,000
Net Par Outstanding Credit Derivatives8,153,000,0008,358,000,000
Number of Risks in Financial Guaranty Insurance339315
Number of risks in FG VIE2517
Number of Risks in Credit Derivative9893
Number of Risks in Category462425
Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding10,559,000,0008,691,000,000
Net Par Outstanding Financial Guaranty Insurance6,254,000,0005,091,000,000
Net par outstanding FG VIE436,000,000359,000,000
Net Par Outstanding Credit Derivatives3,869,000,0003,241,000,000
Number of Risks in Financial Guaranty Insurance162117
Number of risks in FG VIE32
Number of Risks in Credit Derivative3531
Number of Risks in Category200150
Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding7,089,000,0009,174,000,000
Net Par Outstanding Financial Guaranty Insurance4,107,000,0005,222,000,000
Net par outstanding FG VIE1,084,000,000495,000,000
Net Par Outstanding Credit Derivatives1,898,000,0003,457,000,000
Number of Risks in Financial Guaranty Insurance6496
Number of risks in FG VIE82
Number of Risks in Credit Derivative3850
Number of Risks in Category110148
Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding9,579,000,0008,941,000,000
Net Par Outstanding Financial Guaranty Insurance5,917,000,0005,901,000,000
Net par outstanding FG VIE1,276,000,0001,380,000,000
Net Par Outstanding Credit Derivatives$ 2,386,000,000$ 1,660,000,000
Number of Risks in Financial Guaranty Insurance113102
Number of risks in FG VIE1413
Number of Risks in Credit Derivative2512
Number of Risks in Category152127