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Fair Value, Assets Recorded at Fair Value on a Nonrecurring Basis Level 3 Valuation Techniques and Significant Unobservable Inputs (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 12 Months Ended |
|---|---|---|
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Mar. 31, 2013
|
Dec. 31, 2012
|
|
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| Mortgages held for sale | 42,624 | 42,305 |
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Minimum [Member] | Mortgages held for sale [Member] | Discounted cash flow [Member]
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| Fair Value Inputs [Abstract] | ||
| Discount rate | 3.40% | 3.40% |
| Loss severity | 1.40% | 1.30% |
| Default rate | 0.70% | 0.60% |
| Prepayment rate | 1.00% | 1.00% |
|
Minimum [Member] | Residential Portfolio Segment [Member] | Mortgages held for sale [Member] | Discounted cash flow [Member]
|
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| Fair Value Inputs [Abstract] | ||
| Discount rate | 4.00% | 4.10% |
| Loss severity | 2.00% | 2.00% |
| Default rate | 1.10% | 2.90% |
| Prepayment rate | 1.00% | 1.00% |
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Maximum [Member] | Mortgages held for sale [Member] | Discounted cash flow [Member]
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| Fair Value Inputs [Abstract] | ||
| Discount rate | 7.90% | 7.50% |
| Loss severity | 36.20% | 35.30% |
| Default rate | 14.90% | 14.80% |
| Prepayment rate | 10.60% | 11.00% |
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Maximum [Member] | Residential Portfolio Segment [Member] | Mortgages held for sale [Member] | Discounted cash flow [Member]
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| Fair Value Inputs [Abstract] | ||
| Discount rate | 11.80% | 11.90% |
| Loss severity | 42.60% | 45.00% |
| Default rate | 6.50% | 21.20% |
| Prepayment rate | 100.00% | 100.00% |
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Weighted Average [Member] | Mortgages held for sale [Member] | Discounted cash flow [Member]
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| Fair Value Inputs [Abstract] | ||
| Discount rate | 5.50% | 5.40% |
| Loss severity | 26.60% | 26.40% |
| Default rate | 3.50% | 5.50% |
| Prepayment rate | 5.70% | 6.20% |
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Weighted Average [Member] | Residential Portfolio Segment [Member] | Mortgages held for sale [Member] | Discounted cash flow [Member]
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| Fair Value Inputs [Abstract] | ||
| Discount rate | 10.70% | 10.90% |
| Loss severity | 5.80% | 6.00% |
| Default rate | 3.00% | 7.90% |
| Prepayment rate | 66.30% | 66.70% |
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Nonrecurring [Member]
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| Mortgages held for sale | 3,197 | 2,554 |
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Level 3 [Member] | Nonrecurring [Member]
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| Mortgages held for sale | 1,042 | 1,045 |
| Total insignificant level 3 assets | 73 | 148 |
| Total | 1,115 | 1,193 |
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Level 3 [Member] | Nonrecurring [Member] | Residential Portfolio Segment [Member] | Discounted cash flow [Member]
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| Mortgages held for sale | 1,042 | 1,045 |