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Mortgage Banking Activities Textuals (Details) (USD $)
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12 Months Ended | |||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2008
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| Mortgage Banking Activities (Textual) [Abstract] | ||||
| Amortization | $ (264,000,000) | $ (228,000,000) | $ (264,000,000) | |
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Commercial Mortgage Servicing [Member]
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| Mortgage Banking Activities (Textual) [Abstract] | ||||
| Fair value residential amortized MSR | 1,440,000,000 | 1,371,000,000 | ||
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Residential Mortgage Servicing [Member]
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| Mortgage Banking Activities (Textual) [Abstract] | ||||
| Amortization | (50,000,000) | (5,000,000) | ||
| Fair value residential amortized MSR | 316,000,000 | 441,000,000 | ||
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Liability for mortgage loans repurchase losses [Member]
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| Mortgage Banking Activities (Textual) [Abstract] | ||||
| Loss Contingency, Range of Possible Loss, Portion Not Accrued | 2,100,000,000 | |||
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Amortized [Member]
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| Mortgage Banking Activities (Textual) [Abstract] | ||||
| Amortization | (264,000,000) | (228,000,000) | (264,000,000) | |
| Valuation allowance | 37,000,000 | 3,000,000 | 0 | 0 |
| Fair value residential amortized MSR | 1,756,000,000 | 1,812,000,000 | 1,261,000,000 | 1,555,000,000 |
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Amortized [Member] | Residential Mortgage Servicing [Member]
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| Mortgage Banking Activities (Textual) [Abstract] | ||||
| Balance of amortized MSRs | 350,000,000 | 400,000,000 | ||
| Valuation allowance | $ 37,000,000 | $ 3,000,000 | ||