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Representations and Warranties Obligations and Corporate Guarantees - Loan Repurchases (Details) (USD $)
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3 Months Ended | 9 Months Ended | |||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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| Guarantor Obligations [Line Items] | |||||
| Representations Warranties And Guarantees Maximum Exposure Above Existing Accruals | $ 4,000,000,000 | ||||
| Payments for Legal Settlements | 51,000,000 | 469,000,000 | 1,700,000,000 | 600,000,000 | |
| Unpaid Principal Balance | 343,000,000 | 431,000,000 | 1,191,000,000 | 1,686,000,000 | |
| Cash Paid for Repurchases | 277,000,000 | 396,000,000 | 1,035,000,000 | 1,410,000,000 | |
| Loss | 168,000,000 | 231,000,000 | 466,000,000 | 640,000,000 | |
| Repurchase Demands Excluded from Outstanding Claims | 1,400,000,000 | 1,400,000,000 | 1,600,000,000 | ||
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First Lien Mortgages [Member]
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| Guarantor Obligations [Line Items] | |||||
| Unpaid Principal Balance | 318,000,000 | 422,000,000 | 1,142,000,000 | 1,636,000,000 | |
| Cash Paid for Repurchases | 251,000,000 | 387,000,000 | 984,000,000 | 1,363,000,000 | |
| Loss | 142,000,000 | 224,000,000 | 415,000,000 | 611,000,000 | |
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Home Equity [Member]
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| Guarantor Obligations [Line Items] | |||||
| Unpaid Principal Balance | 25,000,000 | 9,000,000 | 49,000,000 | 50,000,000 | |
| Cash Paid for Repurchases | 26,000,000 | 9,000,000 | 51,000,000 | 47,000,000 | |
| Loss | 26,000,000 | 7,000,000 | 51,000,000 | 29,000,000 | |
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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 | 128,000,000 | 239,000,000 | 661,000,000 | 989,000,000 | |
| Cash Paid for Repurchases | 136,000,000 | 261,000,000 | 693,000,000 | 1,065,000,000 | |
| Loss | 27,000,000 | 98,000,000 | 124,000,000 | 313,000,000 | |
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Obligation to Repurchase Receivables Sold [Member] | Home Equity [Member]
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| Guarantor Obligations [Line Items] | |||||
| Unpaid Principal Balance | 0 | 2,000,000 | 0 | 18,000,000 | |
| Cash Paid for Repurchases | 0 | 2,000,000 | 0 | 18,000,000 | |
| Loss | 0 | ||||
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Indemnification Agreement [Member] | First Lien Mortgages [Member]
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| Guarantor Obligations [Line Items] | |||||
| Unpaid Principal Balance | 190,000,000 | 183,000,000 | 481,000,000 | 647,000,000 | |
| Cash Paid for Repurchases | 115,000,000 | 126,000,000 | 291,000,000 | 298,000,000 | |
| Loss | 115,000,000 | 126,000,000 | 291,000,000 | 298,000,000 | |
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Indemnification Agreement [Member] | Home Equity [Member]
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| Guarantor Obligations [Line Items] | |||||
| Unpaid Principal Balance | 25,000,000 | 7,000,000 | 49,000,000 | 32,000,000 | |
| Cash Paid for Repurchases | 26,000,000 | 7,000,000 | 51,000,000 | 29,000,000 | |
| Loss | 26,000,000 | 7,000,000 | 51,000,000 | 29,000,000 | |
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Other Non Government Sponsored Entites [Member]
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| Guarantor Obligations [Line Items] | |||||
| Outstanding Claims For Representations And Warranties Unpaid Principal Balance | 14,800,000,000 | 14,800,000,000 | |||
| Repurchase Demands Excluded from Outstanding Claims | 13,900,000,000 | 13,900,000,000 | |||
| Repurchase Demands under Review | $ 911,000,000 | $ 911,000,000 | |||