Quarterly report pursuant to Section 13 or 15(d)

Representations and Warranties Obligations and Corporate Guarantees (Details)

Representations and Warranties Obligations and Corporate Guarantees (Details) (USD $)	3 Months Ended
	Mar. 31, 2012 RescissionNotices Payment	Mar. 31, 2011	Dec. 31, 2011 RescissionNotices
Guarantor Obligations [Line Items]
Number of Payments Made By Borrower	25
Percentage of loans underlying outstanding repurchase demands	28.00%
New Purchase Claims	$ 4,700,000,000
Amount of Loan Repurchase Claims Resolved	1,300,000,000
Amount of Loan Repurchase Claims Resolved Through Rescission	773,000,000
Amount of Loan Repurchase Claims Resolved Through Repurchase and Make Whole Payments	480,000,000
Number of Open Mortgage Insurance Rescission Notices	99,000		90,000
Percent of Mortgage Insurance Recission Notes Received Which Are Resolved	27.00%
Percent of Mortgage Insurance Recission Notes Received Which Are Not Yet Resolved	73.00%
Provision	282,000,000	1,013,000,000
Representations Warranties And Guarantees Maximum Exposure Above Existing Accruals	5,000,000,000
Percentage of the voting rights of outstanding securities required to investigate loans files and demand repurchase of loans	25.00%
Unpaid principal balance of loans without repurchase requests	6,100,000,000
Percentage of loans resolved through repurchase or make whole payments	24.00%
Private Label Securitization Trust Related Repurchase Claims	50.00%
Private Label Securitization Trust Related Repurchase Claims	1,500,000,000	168,000,000
Government sponsored enterprise obligations [Member]
Guarantor Obligations [Line Items]
New Purchase Claims	3,000,000,000
Other Non Government Sponsored Entites [Member]
Guarantor Obligations [Line Items]
New Purchase Claims	1,700,000,000
Monoline [Member]
Guarantor Obligations [Line Items]
Outstanding Claims For Representations And Warranties Unpaid Principal Balance	3,100,000,000
Indemnification Agreement [Member]
Guarantor Obligations [Line Items]
Cash Paid for Repurchases	423,000,000	577,000,000
Unpaid Principal Balance Of Loan Guarantees Satisfied [Member]
Guarantor Obligations [Line Items]
Unpaid Principal Balance	532,000,000	723,000,000
Obligation to Repurchase Receivables Sold [Member]
Guarantor Obligations [Line Items]
Loss	$ 264,000,000	$ 346,000,000
Resolved Through Acceptance [Member]
Guarantor Obligations [Line Items]
Percent of Mortgage Insurance Recission Notes Received Which Are Resolved	22.00%
Resolved Through Reinstatement of Coverage or Payment of Claim [Member]
Guarantor Obligations [Line Items]
Percent of Mortgage Insurance Recission Notes Received Which Are Resolved	46.00%
Resolved Through Settlement, Policy Commutation or Similar Arrangement [Member]
Guarantor Obligations [Line Items]
Percent of Mortgage Insurance Recission Notes Received Which Are Resolved	32.00%
Implicated by Ongoing Litigation [Member]
Guarantor Obligations [Line Items]
Percent of Mortgage Insurance Recission Notes Received Which Are Not Yet Resolved	45.00%
In Process of Review [Member]
Guarantor Obligations [Line Items]
Percent of Mortgage Insurance Recission Notes Received Which Are Not Yet Resolved	34.00%
Reviewed and Being Contested [Member]
Guarantor Obligations [Line Items]
Percent of Mortgage Insurance Recission Notes Received Which Are Not Yet Resolved	66.00%
Subject of Ongoing Litigation [Member]
Guarantor Obligations [Line Items]
Percent of Mortgage Insurance Recission Notes Received Which Are Not Yet Resolved	25.00%
Minimum [Member]
Guarantor Obligations [Line Items]
Timeframe To Resolve Repurchase Claims In Dispute	90 days
Timetable to reach a settlement once a breach of representations and warranties is confirmed	60 days
Maximum [Member]
Guarantor Obligations [Line Items]
Timeframe To Resolve Repurchase Claims In Dispute	120 days
Timetable to reach a settlement once a breach of representations and warranties is confirmed	90 days