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	Jun. 30, 2014		Dec. 31, 2013
Guarantor Obligations [Line Items]
Salvage and subrogation recoverable, net of reinsurance	$ 253	[1]	$ 155	[1]
Other recoveries	59		36
Net expected loss to be expensed	370	[2]
Net expected loss to be expensed related to consolidated financial guaranty VIEs	82
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	38
Salvage and subrogation recoverable, net of reinsurance	247
Loss and LAE reserve, net of reinsurance	(714)
Other recoveries	15	[3]
Financial Guarantee [Member]
Guarantor Obligations [Line Items]
Net expected loss to be paid	784
Financial Guarantee [Member] | Before VIE Adjustment [Member]
Guarantor Obligations [Line Items]
Net expected loss to be paid	892
Financial guaranty insurance
Guarantor Obligations [Line Items]
Net expected loss to be paid	784		741
Contra-paid, net	38	[4]	39	[4]
Net expected loss to be expensed	$ 370	[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 $82 million in net expected loss to be expensed on a present value basis.

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

[4] Excludes $132 million and $187 million of deferred premium revenue, and $47 million and $55 million of contra-paid related to FG VIEs as of June 30, 2014 and December 31, 2013, respectively.

[5] Excludes $82 million as of June 30, 2014, related to consolidated FG VIEs.