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Variable Interest Entities and Securitization Activities (Mortgage Servicing Activities for SPEs) (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2012
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Dec. 31, 2011
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| Amounts past due 90 days or greater (unpaid principal balance) | $ 800 | $ 1,500 | ||||
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Unconsolidated SPEs | Residential Mortgage
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| Assets serviced (unpaid principal balance) | 805 | 9,821 | ||||
| Amounts past due 90 days or greater (unpaid principal balance) | 85 | [1] | 3,087 | [1] | ||
| Percentage of amounts past due 90 days or greater | 10.60% | [1] | 31.40% | [1] | ||
| Credit losses | 0 | 631 | ||||
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Unconsolidated SPEs | Commercial Mortgage
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| Assets serviced (unpaid principal balance) | 5,923 | 5,750 | ||||
| Amounts past due 90 days or greater (unpaid principal balance) | 0 | [1] | 0 | [1] | ||
| Percentage of amounts past due 90 days or greater | 0.00% | [1] | 0.00% | [1] | ||
| Credit losses | 0 | 0 | ||||
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Consolidated SPEs | Residential Mortgage
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| Assets serviced (unpaid principal balance) | 1,187 | 2,180 | ||||
| Amounts past due 90 days or greater (unpaid principal balance) | 34 | [1] | 354 | [1] | ||
| Percentage of amounts past due 90 days or greater | 2.90% | [1] | 16.20% | [1] | ||
| Credit losses | 5 | 81 | ||||
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Consolidated SPEs | Commercial Mortgage
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| Assets serviced (unpaid principal balance) | 878 | 1,596 | ||||
| Amounts past due 90 days or greater (unpaid principal balance) | 0 | [1] | 0 | [1] | ||
| Percentage of amounts past due 90 days or greater | 0.00% | [1] | 0.00% | [1] | ||
| Credit losses | $ 0 | $ 0 | ||||
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