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Representations and Warranties Obligations and Corporate Guarantees - Loan Repurchases (Details) (USD $)
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12 Months Ended | |||||||||
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Dec. 31, 2012
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Dec. 31, 2011
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Counterparty | $ 28,278,000,000 | [1],[2],[3] | $ 12,607,000,000 | [1],[2] | ||||||
| New Purchase Claims | 22,400,000,000 | |||||||||
| Outstanding Claims, From Mortgage Insurance Recission Notices | 2,300,000,000 | 1,200,000,000 | ||||||||
| Loss On Repurchase Or Reimbursement Of Repurchase Claims For First Lien Mortgages And Home Equity Loans From The Investor Or Securitization Trust | 1,600,000,000 | 1,700,000,000 | ||||||||
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First Lien Mortgages [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Unpaid Principal Balance | 2,015,000,000 | 6,042,000,000 | ||||||||
| Cash Paid for Repurchases | 1,698,000,000 | 5,093,000,000 | ||||||||
| Loss | 814,000,000 | 3,372,000,000 | ||||||||
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Home Equity Line of Credit [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Unpaid Principal Balance | 60,000,000 | 127,000,000 | ||||||||
| Cash Paid for Repurchases | 57,000,000 | 127,000,000 | ||||||||
| Loss | 33,000,000 | 113,000,000 | ||||||||
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Obligation to Repurchase Receivables Sold [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Loss | 847,000,000 | 3,485,000,000 | ||||||||
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Obligation to Repurchase Receivables Sold [Member] | First Lien Mortgages [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Unpaid Principal Balance | 1,184,000,000 | 2,713,000,000 | ||||||||
| Cash Paid for Repurchases | 1,273,000,000 | 3,067,000,000 | ||||||||
| Loss | 389,000,000 | 1,346,000,000 | ||||||||
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Obligation to Repurchase Receivables Sold [Member] | Home Equity Line of Credit [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Unpaid Principal Balance | 24,000,000 | 28,000,000 | ||||||||
| Cash Paid for Repurchases | 24,000,000 | 28,000,000 | ||||||||
| Loss | 0 | 14,000,000 | ||||||||
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Indemnification Agreement [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Cash Paid for Repurchases | 1,755,000,000 | 5,220,000,000 | ||||||||
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Indemnification Agreement [Member] | First Lien Mortgages [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Unpaid Principal Balance | 831,000,000 | 3,329,000,000 | ||||||||
| Cash Paid for Repurchases | 425,000,000 | 2,026,000,000 | ||||||||
| Loss | 425,000,000 | 2,026,000,000 | ||||||||
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Indemnification Agreement [Member] | Home Equity Line of Credit [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Unpaid Principal Balance | 36,000,000 | 99,000,000 | ||||||||
| Cash Paid for Repurchases | 33,000,000 | 99,000,000 | ||||||||
| Loss | 33,000,000 | 99,000,000 | ||||||||
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Monoline [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| New Purchase Claims | 295,000,000 | |||||||||
| Outstanding Claims For Representations And Warranties Unpaid Principal Balance | 2,400,000,000 | 3,100,000,000 | ||||||||
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Whole loan sale, private-label securitizations and other [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Repurchase Demands Received Excluded from Outstanding Claims | 1,300,000,000 | |||||||||
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United States Government Agencies And Sponsored Enterprises Debt Securities [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Counterparty | 13,530,000,000 | [1],[2],[3] | 6,221,000,000 | [1],[2] | ||||||
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Whole loan sale, private-label securitizations and other [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Counterparty | $ 12,299,000,000 | [1],[2] | $ 3,304,000,000 | [1],[2] | ||||||
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