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Representations and Warranties Obligations and Corporate Guarantees - Loan Repurchases (Details) (USD $)
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3 Months Ended | 6 Months Ended | |||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 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 | 1,600,000,000 | 56,000,000 | 1,700,000,000 | 131,000,000 | |
| Unpaid Principal Balance | 284,000,000 | 723,000,000 | 848,000,000 | 1,255,000,000 | |
| Cash Paid for Repurchases | 250,000,000 | 591,000,000 | 758,000,000 | 1,014,000,000 | |
| Loss | 171,000,000 | 145,000,000 | 298,000,000 | 409,000,000 | |
| Repurchase Demands Excluded from Outstanding Claims | 1,500,000,000 | 1,500,000,000 | 1,600,000,000 | ||
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First Lien Mortgages [Member]
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| Guarantor Obligations [Line Items] | |||||
| Unpaid Principal Balance | 268,000,000 | 697,000,000 | 824,000,000 | 1,214,000,000 | |
| Cash Paid for Repurchases | 234,000,000 | 568,000,000 | 733,000,000 | 976,000,000 | |
| Loss | 155,000,000 | 134,000,000 | 273,000,000 | 387,000,000 | |
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Home Equity [Member]
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| Guarantor Obligations [Line Items] | |||||
| Unpaid Principal Balance | 16,000,000 | 26,000,000 | 24,000,000 | 41,000,000 | |
| Cash Paid for Repurchases | 16,000,000 | 23,000,000 | 25,000,000 | 38,000,000 | |
| Loss | 16,000,000 | 11,000,000 | 25,000,000 | 22,000,000 | |
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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 | 112,000,000 | 500,000,000 | 533,000,000 | 750,000,000 | |
| Cash Paid for Repurchases | 120,000,000 | 520,000,000 | 557,000,000 | 804,000,000 | |
| Loss | 41,000,000 | 86,000,000 | 97,000,000 | 215,000,000 | |
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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 | 12,000,000 | 0 | 16,000,000 | |
| Cash Paid for Repurchases | 0 | 12,000,000 | 0 | 16,000,000 | |
| Loss | 0 | ||||
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Indemnification Agreement [Member] | First Lien Mortgages [Member]
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| Guarantor Obligations [Line Items] | |||||
| Unpaid Principal Balance | 156,000,000 | 197,000,000 | 291,000,000 | 464,000,000 | |
| Cash Paid for Repurchases | 114,000,000 | 48,000,000 | 176,000,000 | 172,000,000 | |
| Loss | 114,000,000 | 48,000,000 | 176,000,000 | 172,000,000 | |
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Indemnification Agreement [Member] | Home Equity [Member]
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| Guarantor Obligations [Line Items] | |||||
| Unpaid Principal Balance | 16,000,000 | 14,000,000 | 24,000,000 | 25,000,000 | |
| Cash Paid for Repurchases | 16,000,000 | 11,000,000 | 25,000,000 | 22,000,000 | |
| Loss | 16,000,000 | 11,000,000 | 25,000,000 | 22,000,000 | |
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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 | 13,900,000,000 | 13,900,000,000 | |||
| Repurchase Demands Excluded from Outstanding Claims | 13,400,000,000 | 13,400,000,000 | |||
| Repurchase Demands under Review | $ 545,000,000 | $ 545,000,000 | |||