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Mortgage Servicing Rights - Rollforward of Mortgage Servicing Rights (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||||||||||||||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Activity for residential first mortgage MSRs | ||||||||||||||||
| Balance, beginning of period | $ 4,368,000,000 | $ 5,827,000,000 | $ 5,042,000,000 | $ 5,716,000,000 | ||||||||||||
| Additions | 203,000,000 | 129,000,000 | 581,000,000 | 399,000,000 | ||||||||||||
| Sales | (1,000,000) | (729,000,000) | (47,000,000) | (1,774,000,000) | ||||||||||||
| Amortization of expected cash flows | (232,000,000) | [1] | (240,000,000) | [1] | (699,000,000) | [1] | (814,000,000) | [1] | ||||||||
| Impact of changes in interest rates and other market factors | (10,000,000) | [2] | 24,000,000 | [2] | (637,000,000) | [2] | 1,162,000,000 | [2] | ||||||||
| Model and other cash flow assumption changes: | ||||||||||||||||
| Projected cash flows, including changes in costs to service loans | (82,000,000) | [3] | 9,000,000 | [3] | (36,000,000) | [3] | 23,000,000 | [3] | ||||||||
| Impact of changes in the Home Price Index | 5,000,000 | [3] | (197,000,000) | [3] | (2,000,000) | [3] | (399,000,000) | [3] | ||||||||
| Impact of changes to the prepayment model | (18,000,000) | [3] | 206,000,000 | [3] | 142,000,000 | [3] | 609,000,000 | [3] | ||||||||
| Other model changes | 10,000,000 | [3],[4] | 29,000,000 | [3],[4] | (101,000,000) | [3],[4] | 136,000,000 | [3],[4] | ||||||||
| Balance, end of period | 4,243,000,000 | 5,058,000,000 | 4,243,000,000 | 5,058,000,000 | ||||||||||||
| Mortgage loans serviced for investors (in billions) | 507,000,000,000 | 616,000,000,000 | 507,000,000,000 | 616,000,000,000 | ||||||||||||
| Option adjusted spread due to MSR model recalibration | $ (127,000,000) | |||||||||||||||
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