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Outstanding Exposure (Details 2) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Outstanding Exposure  
Net Par Outstanding$ 587,196,000,000$ 617,131,000,000
% of Total Net Par Outstanding (as a percent)100.00%100.00%
Net Par Outstanding Credit Derivatives98,005,000,000109,771,000,000
RMBS
  
Outstanding Exposure  
Minimum par of assumed credits1,000,000 
Net par outstanding of transactions covered by the Bank of America Agreement4,400,000,000 
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 Outstanding23,266,000,00025,130,000,000
U.S. RMBS | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding15,857,000,00016,355,000,000
% 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 Outstanding2,110,000,0002,252,000,000
U.S. RMBS | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding7,187,000,0008,528,000,000
U.S. RMBS | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding6,560,000,0005,575,000,000
Prime first lien
  
Outstanding Exposure  
Net Par Outstanding786,000,000849,000,000
Prime first lien | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding608,000,000624,000,000
% 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 Outstanding26,000,00082,000,000
Prime first lien | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding582,000,000542,000,000
Alt-A first lien
  
Outstanding Exposure  
Net Par Outstanding5,731,000,0006,134,000,000
Alt-A first lien | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding5,011,000,0004,657,000,000
% 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 Outstanding1,127,000,000976,000,000
Alt-A first lien | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding2,397,000,0003,108,000,000
Alt-A first lien | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding1,487,000,000573,000,000
Option ARM
  
Outstanding Exposure  
Net Par Outstanding2,809,000,0003,214,000,000
Option ARM | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding2,562,000,0002,859,000,000
% of Total Net Par Outstanding (as a percent)0.40%0.50%
Option ARM | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding 33,000,000
Option ARM | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding1,302,000,0002,186,000,000
Option ARM | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding1,260,000,000640,000,000
Subprime
  
Outstanding Exposure  
Net Par Outstanding8,572,000,0009,039,000,000
Subprime | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding3,014,000,0003,083,000,000
% of Total Net Par Outstanding (as a percent)0.50%0.40%
Subprime | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding334,000,000729,000,000
Subprime | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding2,468,000,0002,248,000,000
Subprime | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding212,000,000106,000,000
CES
  
Outstanding Exposure  
Net Par Outstanding1,087,000,0001,164,000,000
CES | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding1,058,000,0001,131,000,000
% of Total Net Par Outstanding (as a percent)0.20%0.20%
CES | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding153,000,00063,000,000
CES | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding438,000,000444,000,000
CES | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding467,000,000624,000,000
HELOCs
  
Outstanding Exposure  
Net Par Outstanding4,281,000,0004,730,000,000
HELOCs | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding3,604,000,0004,001,000,000
% of Total Net Par Outstanding (as a percent)0.60%0.60%
HELOCs | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding470,000,000369,000,000
HELOCs | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding3,134,000,0003,632,000,000
Other structured finance
  
Outstanding Exposure  
Net Par Outstanding109,430,000,000.00124,262,000,000
Other structured finance | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding6,608,000,0005,497,000,000
% of Total Net Par Outstanding (as a percent)1.10%0.90%
Other structured finance | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding3,756,000,0002,687,000,000
Other structured finance | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding424,000,000363,000,000
Other structured finance | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding2,428,000,0002,447,000,000
Public finance
  
Outstanding Exposure  
Net Par Outstanding454,500,000,000.00467,739,000,000
Public finance | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding5,310,000,0004,954,000,000
% of Total Net Par Outstanding (as a percent)0.90%0.80%
Public finance | Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding4,241,000,0003,752,000,000
Public finance | Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding204,000,000283,000,000
Public finance | Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding865,000,000919,000,000
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 Outstanding27,775,000,00026,806,000,000
% of Total Net Par Outstanding (as a percent)4.70%4.30%
Net Par Outstanding Financial Guaranty Insurance19,339,000,00018,448,000,000
Net Par Outstanding Credit Derivatives8,436,000,0008,358,000,000
Number of Risks in Financial Guaranty Insurance364332
Number of Risks in Credit Derivative9793
Number of Risks in Category461425
Below investment grade ("BIG") | BIG 1
  
Outstanding Exposure  
Net Par Outstanding10,107,000,0008,691,000,000
Net Par Outstanding Financial Guaranty Insurance6,877,000,0005,450,000,000
Net Par Outstanding Credit Derivatives3,230,000,0003,241,000,000
Number of Risks in Financial Guaranty Insurance151119
Number of Risks in Credit Derivative3031
Number of Risks in Category181150
Below investment grade ("BIG") | BIG 2
  
Outstanding Exposure  
Net Par Outstanding7,815,000,0009,174,000,000
Net Par Outstanding Financial Guaranty Insurance5,038,000,0005,717,000,000
Net Par Outstanding Credit Derivatives2,777,000,0003,457,000,000
Number of Risks in Financial Guaranty Insurance8498
Number of Risks in Credit Derivative4450
Number of Risks in Category128148
Below investment grade ("BIG") | BIG 3
  
Outstanding Exposure  
Net Par Outstanding9,853,000,0008,941,000,000
Net Par Outstanding Financial Guaranty Insurance7,424,000,0007,281,000,000
Net Par Outstanding Credit Derivatives$ 2,429,000,000$ 1,660,000,000
Number of Risks in Financial Guaranty Insurance129115
Number of Risks in Credit Derivative2312
Number of Risks in Category152127