Financial Guaranty Contracts Accounted for as Credit Derivatives - Net Fair Value and Expected Losses of Credit Derivatives by Sector (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Credit Derivatives
Fair Value of Credit Derivative Asset (Liability), net	$ (1,693)		$ (1,793)
Present Value of Expected Claim (Payments) Recoveries	(139)	[1]	(282)	[1]
Present Value of Future Installment Fees Receivable	45		43
R and W Included in Credit Derivative Asset (Liability)	180		237
Pooled corporate obligations
Credit Derivatives
Fair Value of Credit Derivative Asset (Liability), net	(30)		6
Present Value of Expected Claim (Payments) Recoveries	(35)	[1]	(16)	[1]
U.S. RMBS
Credit Derivatives
Fair Value of Credit Derivative Asset (Liability), net	(1,308)		(1,237)
Present Value of Expected Claim (Payments) Recoveries	(147)	[1]	(181)	[1]
CMBS
Credit Derivatives
Fair Value of Credit Derivative Asset (Liability), net	(2)		(2)
Present Value of Expected Claim (Payments) Recoveries	0	[1]	0	[1]
Other
Credit Derivatives
Fair Value of Credit Derivative Asset (Liability), net	(353)		(560)
Present Value of Expected Claim (Payments) Recoveries	$ 43	[1]	$ (85)	[1]

[1] Represents the expected claim payments (recoveries) in excess of the present value of future installment fees to be received of $45 million as of December 31, 2013 and $43 million as of December 31, 2012. Includes R&W benefit of $180 million as of December 31, 2013 and $237 million as of December 31, 2012.