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Outstanding Exposure (Details) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Outstanding Exposure  
Gross Debt Service Outstanding$ 984,553,000,000$ 1,029,982,000,000
Net Debt Service Outstanding886,768,000,000927,143,000,000
Net Par Outstanding587,196,000,000617,131,000,000
% of Total Net Par Outstanding (as a percent)100.00%100.00%
Public finance
  
Outstanding Exposure  
Gross Debt Service Outstanding826,907,000,000851,634,000,000
Net Debt Service Outstanding739,493,000,000760,167,000,000
Net Par Outstanding454,500,000,000.00467,739,000,000
Outstanding commitments to provide guaranties1,700,000,000 
Outstanding commitments to provide guaranties, amount expiring prior to December 31, 20111,300,000,000 
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 U.S.
  
Outstanding Exposure  
Net Par Outstanding413,274,000,000426,996,000,000
% of Total Net Par Outstanding (as a percent)100.00%100.00%
Public finance U.S. | AAA.
  
Outstanding Exposure  
Net Par Outstanding5,078,000,0005,784,000,000
% of Total Net Par Outstanding (as a percent)1.20%1.40%
Public finance U.S. | AA.
  
Outstanding Exposure  
Net Par Outstanding151,571,000,000161,906,000,000
% of Total Net Par Outstanding (as a percent)36.70%37.90%
Public finance U.S. | A
  
Outstanding Exposure  
Net Par Outstanding211,736,000,000214,199,000,000
% of Total Net Par Outstanding (as a percent)51.20%50.20%
Public finance U.S. | BBB
  
Outstanding Exposure  
Net Par Outstanding41,939,000,00041,948,000,000
% of Total Net Par Outstanding (as a percent)10.20%9.80%
Public finance U.S. | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding2,950,000,0003,159,000,000
% of Total Net Par Outstanding (as a percent)0.70%0.70%
Public finance Non-U.S.
  
Outstanding Exposure  
Net Par Outstanding41,226,000,00040,743,000,000
% of Total Net Par Outstanding (as a percent)100.00%100.00%
Public finance Non-U.S. | Super senior
  
Outstanding Exposure  
Net Par Outstanding1,507,000,0001,420,000,000
% of Total Net Par Outstanding (as a percent)3.70%3.50%
Public finance Non-U.S. | AAA.
  
Outstanding Exposure  
Net Par Outstanding1,379,000,0001,378,000,000
% of Total Net Par Outstanding (as a percent)3.30%3.40%
Public finance Non-U.S. | AA.
  
Outstanding Exposure  
Net Par Outstanding1,145,000,0001,330,000,000
% of Total Net Par Outstanding (as a percent)2.80%3.30%
Public finance Non-U.S. | A
  
Outstanding Exposure  
Net Par Outstanding12,517,000,00012,482,000,000
% of Total Net Par Outstanding (as a percent)30.40%30.60%
Public finance Non-U.S. | BBB
  
Outstanding Exposure  
Net Par Outstanding22,318,000,00022,338,000,000
% of Total Net Par Outstanding (as a percent)54.10%54.80%
Public finance Non-U.S. | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding2,360,000,0001,795,000,000
% of Total Net Par Outstanding (as a percent)5.70%4.40%
Other Structured finance.
  
Outstanding Exposure  
Gross Debt Service Outstanding157,646,000,000178,348,000,000
Net Debt Service Outstanding147,275,000,000166,976,000,000
Outstanding commitments to provide guaranties3,900,000,000 
Structured finance U.S.
  
Outstanding Exposure  
Net Par Outstanding103,978,000,000118,756,000,000
% of Total Net Par Outstanding (as a percent)100.00%100.00%
Structured finance U.S. | Super senior
  
Outstanding Exposure  
Net Par Outstanding19,957,000,00021,837,000,000
% of Total Net Par Outstanding (as a percent)19.20%18.40%
Structured finance U.S. | AAA.
  
Outstanding Exposure  
Net Par Outstanding38,175,000,00045,067,000,000
% of Total Net Par Outstanding (as a percent)36.70%37.90%
Structured finance U.S. | AA.
  
Outstanding Exposure  
Net Par Outstanding14,236,000,00017,355,000,000
% of Total Net Par Outstanding (as a percent)13.70%14.60%
Structured finance U.S. | A
  
Outstanding Exposure  
Net Par Outstanding5,721,000,0006,396,000,000
% of Total Net Par Outstanding (as a percent)5.50%5.40%
Structured finance U.S. | BBB
  
Outstanding Exposure  
Net Par Outstanding5,248,000,0007,543,000,000
% of Total Net Par Outstanding (as a percent)5.00%6.40%
Structured finance U.S. | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding20,641,000,00020,558,000,000
% of Total Net Par Outstanding (as a percent)19.90%17.30%
Structured finance Non-U.S.
  
Outstanding Exposure  
Net Par Outstanding28,718,000,00030,636,000,000
% of Total Net Par Outstanding (as a percent)100.00%100.00%
Structured finance Non-U.S. | Super senior
  
Outstanding Exposure  
Net Par Outstanding7,683,000,0007,882,000,000
% of Total Net Par Outstanding (as a percent)26.80%25.70%
Structured finance Non-U.S. | AAA.
  
Outstanding Exposure  
Net Par Outstanding12,722,000,00013,573,000,000
% of Total Net Par Outstanding (as a percent)44.30%44.30%
Structured finance Non-U.S. | AA.
  
Outstanding Exposure  
Net Par Outstanding1,606,000,0001,969,000,000
% of Total Net Par Outstanding (as a percent)5.60%6.40%
Structured finance Non-U.S. | A
  
Outstanding Exposure  
Net Par Outstanding1,610,000,0001,873,000,000
% of Total Net Par Outstanding (as a percent)5.60%6.10%
Structured finance Non-U.S. | BBB
  
Outstanding Exposure  
Net Par Outstanding3,273,000,0004,045,000,000
% of Total Net Par Outstanding (as a percent)11.30%13.20%
Structured finance Non-U.S. | Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding1,824,000,0001,294,000,000
% of Total Net Par Outstanding (as a percent)6.40%4.30%
Super senior
  
Outstanding Exposure  
Net Par Outstanding29,147,000,00031,139,000,000
% of Total Net Par Outstanding (as a percent)5.00%5.00%
AAA.
  
Outstanding Exposure  
Net Par Outstanding57,354,000,00065,802,000,000
% of Total Net Par Outstanding (as a percent)9.80%10.70%
AA.
  
Outstanding Exposure  
Net Par Outstanding168,558,000,000182,560,000,000
% of Total Net Par Outstanding (as a percent)28.70%29.60%
A
  
Outstanding Exposure  
Net Par Outstanding231,584,000,000234,950,000,000
% of Total Net Par Outstanding (as a percent)39.40%38.10%
BBB
  
Outstanding Exposure  
Net Par Outstanding72,778,000,00075,874,000,000
% of Total Net Par Outstanding (as a percent)12.40%12.30%
Below investment grade ("BIG")
  
Outstanding Exposure  
Net Par Outstanding$ 27,775,000,000$ 26,806,000,000
% of Total Net Par Outstanding (as a percent)4.70%4.30%