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Mortgage Servicing Rights (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||||||||||||||||||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
Commercial and Residential Reverse Mortgage [Member]
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Dec. 31, 2011
Commercial and Residential Reverse Mortgage [Member]
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| Servicing Assets at Fair Value [Line Items] | ||||||||||||||||||||
| Servicing Asset at Amortized Cost | $ 172,000,000 | $ 132,000,000 | ||||||||||||||||||
| Activity for residential first mortgage MSRs | ||||||||||||||||||||
| Balance, January 1 | 7,589,000,000 | 15,282,000,000 | 7,378,000,000 | 14,900,000,000 | ||||||||||||||||
| Additions | 91,000,000 | 410,000,000 | 168,000,000 | 1,251,000,000 | ||||||||||||||||
| Sales | (98,000,000) | [1] | (234,000,000) | [1] | (98,000,000) | (234,000,000) | ||||||||||||||
| Impact of customer payments | (282,000,000) | [2] | (639,000,000) | [2] | (803,000,000) | [2] | (1,345,000,000) | [2] | ||||||||||||
| Impact of changes in interest rates and other market factors | (1,717,000,000) | [3] | (1,094,000,000) | [3] | (742,000,000) | [3] | (385,000,000) | [3] | ||||||||||||
| Model and other cash flow assumption changes: | ||||||||||||||||||||
| Projected cash flows, primarily due to increases in cost to service loans | 666,000,000 | [4],[5] | (1,501,000,000) | [4],[5] | 393,000,000 | [4],[5] | (2,029,000,000) | [4],[5] | ||||||||||||
| Impact of changes in the Home Price Index | 5,000,000 | [5] | 212,000,000 | [5] | 20,000,000 | [5] | 434,000,000 | [5] | ||||||||||||
| Impact of changes to the prepayment model | 342,000,000 | [5] | 303,000,000 | [5] | 342,000,000 | [5] | 126,000,000 | [5] | ||||||||||||
| Other model changes | (888,000,000) | [5] | (367,000,000) | [5] | (950,000,000) | [5] | (346,000,000) | [5] | ||||||||||||
| Balance, June 30 | 5,708,000,000 | 12,372,000,000 | 5,708,000,000 | 12,372,000,000 | ||||||||||||||||
| Mortgage loans serviced for investors (in billions) | $ 1,224,000,000,000 | $ 1,578,000,000,000 | $ 1,224,000,000,000 | $ 1,578,000,000,000 | ||||||||||||||||
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