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Representations and Warranties Obligations and Corporate Guarantees (Details) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | |||||||||||||||||||||||
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Sep. 30, 2012
Payment
RescissionNotices
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Jun. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
Payment
RescissionNotices
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Sep. 30, 2011
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Dec. 31, 2011
RescissionNotices
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Sep. 30, 2012
Other Non Government Sponsored Entites [Member]
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Sep. 30, 2012
Monoline [Member]
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Dec. 31, 2011
Monoline [Member]
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Sep. 30, 2012
Indemnification Agreement [Member]
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Sep. 30, 2011
Indemnification Agreement [Member]
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Sep. 30, 2012
Indemnification Agreement [Member]
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Sep. 30, 2011
Indemnification Agreement [Member]
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Sep. 30, 2012
Unpaid Principal Balance Of Loan Guarantees Satisfied [Member]
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Sep. 30, 2011
Unpaid Principal Balance Of Loan Guarantees Satisfied [Member]
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Sep. 30, 2012
Unpaid Principal Balance Of Loan Guarantees Satisfied [Member]
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Sep. 30, 2011
Unpaid Principal Balance Of Loan Guarantees Satisfied [Member]
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Sep. 30, 2012
Obligation to Repurchase Receivables Sold [Member]
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Sep. 30, 2011
Obligation to Repurchase Receivables Sold [Member]
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Sep. 30, 2012
Obligation to Repurchase Receivables Sold [Member]
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Sep. 30, 2011
Obligation to Repurchase Receivables Sold [Member]
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Sep. 30, 2012
Resolved Through Acceptance [Member]
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Sep. 30, 2012
Resolved Through Reinstatement of Coverage or Payment of Claim [Member]
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Sep. 30, 2012
Resolved Through Settlement, Policy Commutation or Similar Arrangement [Member]
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Sep. 30, 2012
Implicated by Ongoing Litigation [Member]
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Sep. 30, 2012
In Process of Review [Member]
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Sep. 30, 2012
Reviewed and Being Contested [Member]
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Sep. 30, 2012
Subject of Ongoing Litigation [Member]
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Sep. 30, 2012
Minimum [Member]
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Sep. 30, 2012
Maximum [Member]
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Jun. 28, 2011
First Mortgage [Member]
Bank Of New York Mellon As Trustee [Member]
Trust
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Jun. 28, 2011
Second Mortgage [Member]
Bank Of New York Mellon As Trustee [Member]
Trust
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| Guarantor Obligations [Line Items] | ||||||||||||||||||||||||||||||||
| Number of Payments Made By Borrower | 25 | 25 | ||||||||||||||||||||||||||||||
| Percentage of loans underlying outstanding repurchase demands | 27.00% | 27.00% | 28.00% | |||||||||||||||||||||||||||||
| Number Of Trusts Involved In Settlement Agreement | 525 | 5 | ||||||||||||||||||||||||||||||
| Number of Open Mortgage Insurance Rescission Notices | 111,000 | 111,000 | 90,000 | |||||||||||||||||||||||||||||
| Percent of Mortgage Insurance Recission Notes Received Which Are Resolved | 29.00% | 29.00% | 21.00% | 54.00% | 25.00% | |||||||||||||||||||||||||||
| Percent of Mortgage Insurance Recission Notes Received Which Are Not Yet Resolved | 71.00% | 71.00% | 44.00% | 37.00% | 63.00% | 37.00% | ||||||||||||||||||||||||||
| Cash Paid for Repurchases | $ 396,000,000 | $ 2,249,000,000 | $ 1,410,000,000 | $ 4,386,000,000 | ||||||||||||||||||||||||||||
| Unpaid Principal Balance | 431,000,000 | 2,644,000,000 | 1,686,000,000 | 5,233,000,000 | ||||||||||||||||||||||||||||
| Loss | 231,000,000 | 1,623,000,000 | 640,000,000 | 2,975,000,000 | ||||||||||||||||||||||||||||
| Provision | 307,000,000 | 278,000,000 | 984,000,000 | 15,328,000,000 | ||||||||||||||||||||||||||||
| Representations Warranties And Guarantees Maximum Exposure Above Existing Accruals | 6,000,000,000 | 5,000,000,000 | ||||||||||||||||||||||||||||||
| Percentage of the voting rights of outstanding securities required to investigate loans files and demand repurchase of loans | 25.00% | |||||||||||||||||||||||||||||||
| Outstanding Claims For Representations And Warranties Unpaid Principal Balance | 10,100,000,000 | 2,600,000,000 | 3,100,000,000 | |||||||||||||||||||||||||||||
| Repurchase Demands under Review | 662,000,000 | |||||||||||||||||||||||||||||||
| Unpaid principal balance of loans without repurchase requests | $ 5,300,000,000 | |||||||||||||||||||||||||||||||
| Percentage of loans resolved through repurchase or make whole payments | 22.00% | |||||||||||||||||||||||||||||||
| Private Label Securitization Trust Related Repurchase Claims | 43.00% | |||||||||||||||||||||||||||||||
| Timeframe To Resolve Repurchase Claims In Dispute | 90 days | 120 days | ||||||||||||||||||||||||||||||
| Timetable to reach a settlement once a breach of representations and warranties is confirmed | 60 days | 90 days | ||||||||||||||||||||||||||||||