Outstanding Exposure (Details 3)	Feb. 28, 2013 USD ($)	Dec. 31, 2012 USD ($) risk		Dec. 31, 2011 USD ($)	Dec. 31, 2012 US Public Finance USD ($) risk	Dec. 31, 2012 US Structured Finance [Member] USD ($) risk	Dec. 31, 2012 Non-sovereign USD ($) risk	Dec. 31, 2012 United States USD ($) risk	Dec. 31, 2012 United Kingdom Non-sovereign USD ($) risk	Dec. 31, 2012 Greece USD ($)		Dec. 31, 2012 Hungary USD ($)		Dec. 31, 2012 Ireland USD ($)		Dec. 31, 2012 Italy USD ($)		Dec. 31, 2012 Italy Non-sovereign USD ($) risk	Dec. 31, 2012 Portugal USD ($)		Dec. 31, 2012 Spain USD ($)		Dec. 31, 2012 Australia Non-sovereign USD ($) risk	Dec. 31, 2012 Canada Non-sovereign USD ($) risk	Dec. 31, 2012 France Non-sovereign USD ($) risk	Dec. 31, 2012 Other Countries Non-sovereign USD ($) risk	Jun. 30, 2012 Sovereign Debt EUR (€)	Dec. 31, 2012 Sovereign and sub-sovereign exposure USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Public finance USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Infrastructure Finance [Member] USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Greece USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Greece Public finance USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Greece Infrastructure Finance [Member] USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Hungary USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Hungary Public finance USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Hungary Infrastructure Finance [Member] USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Ireland USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Ireland Public finance USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Ireland Infrastructure Finance [Member] USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Italy USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Italy Public finance USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Italy Infrastructure Finance [Member] USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Portugal USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Portugal Public finance USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Portugal Infrastructure Finance [Member] USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Spain USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Spain Public finance USD ($)		Dec. 31, 2012 Sovereign and sub-sovereign exposure Spain Infrastructure Finance [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt USD ($)		Dec. 31, 2012 Non Sovereign Debt Regulated Utilities [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt RMBS USD ($)		Dec. 31, 2012 Non Sovereign Debt Commercial Receivable [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Pooled Corporate Obligations [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Greece USD ($)		Dec. 31, 2012 Non Sovereign Debt Greece Regulated Utilities [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Greece RMBS USD ($)		Dec. 31, 2012 Non Sovereign Debt Greece Commercial Receivable [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Greece Pooled Corporate Obligations [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Hungary USD ($)		Dec. 31, 2012 Non Sovereign Debt Hungary Regulated Utilities [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Hungary RMBS USD ($)		Dec. 31, 2012 Non Sovereign Debt Hungary Commercial Receivable [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Hungary Pooled Corporate Obligations [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Ireland USD ($)		Dec. 31, 2012 Non Sovereign Debt Ireland Regulated Utilities [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Ireland RMBS USD ($)		Dec. 31, 2012 Non Sovereign Debt Ireland Commercial Receivable [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Ireland Pooled Corporate Obligations [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Italy USD ($)		Dec. 31, 2012 Non Sovereign Debt Italy Regulated Utilities [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Italy RMBS USD ($)		Dec. 31, 2012 Non Sovereign Debt Italy Commercial Receivable [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Italy Pooled Corporate Obligations [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Portugal USD ($)		Dec. 31, 2012 Non Sovereign Debt Portugal Regulated Utilities [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Portugal RMBS USD ($)		Dec. 31, 2012 Non Sovereign Debt Portugal Commercial Receivable [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Portugal Pooled Corporate Obligations [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Spain USD ($)		Dec. 31, 2012 Non Sovereign Debt Spain Regulated Utilities [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Spain RMBS USD ($)		Dec. 31, 2012 Non Sovereign Debt Spain Commercial Receivable [Member] USD ($)		Dec. 31, 2012 Non Sovereign Debt Spain Pooled Corporate Obligations [Member] USD ($)		Dec. 31, 2012 Below investment grade (BIG) USD ($)		Dec. 31, 2012 Below investment grade (BIG) Greece USD ($)		Dec. 31, 2012 Below investment grade (BIG) Hungary USD ($)		Dec. 31, 2012 Below investment grade (BIG) Ireland USD ($)		Dec. 31, 2012 Below investment grade (BIG) Italy USD ($)		Dec. 31, 2012 Below investment grade (BIG) Portugal USD ($)		Dec. 31, 2012 Below investment grade (BIG) Spain USD ($)		Dec. 31, 2012 California US Public Finance USD ($) risk	Dec. 31, 2012 New York US Public Finance USD ($) risk	Dec. 31, 2012 Pennsylvania US Public Finance USD ($) risk	Dec. 31, 2012 Texas US Public Finance USD ($) risk	Dec. 31, 2012 Florida US Public Finance USD ($) risk	Dec. 31, 2012 Illinois US Public Finance USD ($) risk	Dec. 31, 2012 New Jersey US Public Finance USD ($) risk	Dec. 31, 2012 Michigan US Public Finance USD ($) risk	Dec. 31, 2012 Georgia US Public Finance USD ($) risk	Dec. 31, 2012 Ohio US Public Finance USD ($) risk	Dec. 31, 2012 Other States US Public Finance USD ($) risk
Financial Guaranty Portfolio
Mortgage Loans Transferred to New Servicer	$ 3,000,000,000	$ 2,700,000,000
Insured Financial Obligations Number of Contracts		14,886			13,487	1,080	319	14,567	124									12					33	11	23	116																																																																																																																																1,532	1,051	1,133	1,273	446	933	704	745	205	576	4,889
Insured Financial Obligations Outstanding Principal Amount		519,893,000,000		558,048,000,000	387,967,000,000	74,695,000,000	57,231,000,000	462,662,000,000	23,624,000,000									2,347,000,000					7,558,000,000	4,160,000,000	3,914,000,000	15,628,000,000																																																																																																																																57,302,000,000	31,402,000,000	31,173,000,000	29,942,000,000	24,111,000,000	25,297,000,000	15,999,000,000	15,516,000,000	10,001,000,000	9,634,000,000	137,590,000,000
Insured Financial Obligations Outstanding Principal Amount as Percentage of Total Outstanding Principal		100.00%			74.60%	14.40%	11.00%	89.00%	4.50%									0.50%					1.50%	0.80%	0.80%	2.90%																																																																																																																																11.00%	6.00%	6.00%	5.80%	4.60%	4.90%	3.10%	3.00%	1.90%	1.90%	26.40%
Ceded Par Amount		32,146,000,000	[1]	56,294,000,000
Net Economic Exposure to Selected European Countries		4,596,000,000	[2]							25,000,000	[2],[3]	655,000,000	[2]	365,000,000	[2]	2,347,000,000	[2]		234,000,000	[2]	970,000,000	[2],[3]						2,438,000,000	[2]	1,378,000,000	[2]	1,060,000,000	[2]	0	[2],[3]	0	[2],[3]	0	[2],[3]	434,000,000	[2]	0	[2]	434,000,000	[2]	24,000,000	[2]	0	[2]	24,000,000	[2]	1,340,000,000	[2]	1,007,000,000	[2]	333,000,000	[2]	205,000,000	[2]	105,000,000	[2]	100,000,000	[2]	435,000,000	[2],[3]	266,000,000	[2],[3]	169,000,000	[2],[3]	2,158,000,000	[2]	238,000,000	[2]	856,000,000	[2]	95,000,000	[2]	969,000,000	[2]	25,000,000	[2],[3]	0	[2],[3]	0	[2],[3]	0	[2],[3]	25,000,000	[2],[3]	221,000,000	[2]	0	[2]	219,000,000	[2]	2,000,000	[2]	0	[2]	341,000,000	[2]	0	[2]	139,000,000	[2]	13,000,000	[2]	189,000,000	[2]	1,007,000,000	[2]	229,000,000	[2]	498,000,000	[2]	63,000,000	[2]	217,000,000	[2]	29,000,000	[2]	0	[2]	0	[2]	15,000,000	[2]	14,000,000	[2]	535,000,000	[2],[3]	9,000,000	[2],[3]	0	[2],[3]	2,000,000	[2],[3]	524,000,000	[2],[3]	1,411,000,000	[2]	0	[2],[3]	616,000,000	[2]	7,000,000	[2]	248,000,000	[2]	121,000,000	[2]	419,000,000	[2],[3]
Net exposure of debt																											218,000,000
Mortgage Guaranty Insured Obligations Outstanding Principal Amount		154,000,000
Mortgage Loans Specially Serviced	$ 1,700,000,000	$ 900,000,000

[1] Includes $3,928 million in ceded par outstanding related to insured credit derivatives.

[2] While the Company’s exposures are shown in U.S. dollars, the obligations the Company insures are in various currencies, including U.S. dollars, Euros and British pounds sterling. Included in the table above is $139 million of reinsurance assumed on a 2004 - 2006 pool of Irish residential mortgages that is part of the Company’s remaining legacy mortgage reinsurance business. One of the residential mortgage-backed securities included in the table above includes residential mortgages in both Italy and Germany, and only the portion of the transaction equal to the portion of the original mortgage pool in Italian mortgages is shown in the table.

[3] See Note 6, Expected Loss to be Paid.