Financial Guaranty Insurance Losses - Reconciliation of Net Expected Loss to be Paid and Net Expected Loss to be Expensed Insurance Contracts (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Guarantor Obligations [Line Items]
Total, Salvage and subrogation recoverable payable, net	$ 219	[1]	$ 155	[1]
Reinsurance recoverable on unpaid losses	37		36
Total present value basis	391	[2]
Net expected loss to be expensed related to consolidated financial guaranty VIEs	84
Financial Guaranty Variable Interest Entities
Guarantor Obligations [Line Items]
Net expected loss to be paid	108
Consolidated Entity Excluding Variable Interest Entities (VIE)
Guarantor Obligations [Line Items]
Contra-paid, net	50
Total, Salvage and subrogation recoverable payable, net	214
Loss and LAE reserve	(598)
Reinsurance recoverable on unpaid losses	17	[3]
Financial Guarantee [Member]
Guarantor Obligations [Line Items]
Net expected loss to be paid	708
Financial Guarantee [Member] | Before VIE Adjustment [Member]
Guarantor Obligations [Line Items]
Net expected loss to be paid	816
Financial guaranty insurance
Guarantor Obligations [Line Items]
Net expected loss to be paid	708		741
Contra-paid, net	50	[4]	39	[4]
Total present value basis	$ 391	[5]

[1] (1)See “Components of Net Reserves (Salvage)” table for loss and LAE reserve and salvage and subrogation recoverable components.

[2] Consolidation of FG VIEs resulted in reductions of $84 million in net expected loss to be expensed which is on a present value basis.

[3] R&W recoverables recorded in other assets on the consolidated balance sheet.

[4] Excludes $137 million and $187 million of deferred premium revenue, and $49 million and $55 million of contra-paid related to FG VIEs as of March 31, 2014 and December 31, 2013, respectively.

[5] Excludes $84 million as of March 31, 2014, related to consolidated FG VIEs.