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Mortgage Servicing Rights - Rollforward of Mortgage Servicing Rights (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||||||||||||||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Activity for residential first mortgage MSRs | ||||||||||||||||
| Balance, beginning of period | $ 4,765,000,000 | $ 5,776,000,000 | $ 5,042,000,000 | $ 5,716,000,000 | ||||||||||||
| Additions | 113,000,000 | 147,000,000 | 378,000,000 | 270,000,000 | ||||||||||||
| Sales | (26,000,000) | (862,000,000) | (46,000,000) | (1,045,000,000) | ||||||||||||
| Amortization of expected cash flows | (235,000,000) | [1] | (260,000,000) | [1] | (467,000,000) | [1] | (574,000,000) | [1] | ||||||||
| Impact of changes in interest rates and other market factors | (310,000,000) | [2] | 806,000,000 | [2] | (627,000,000) | [2] | 1,138,000,000 | [2] | ||||||||
| Model and other cash flow assumption changes: | ||||||||||||||||
| Projected cash flows, primarily due to (increases) decreases in cost to service loans | 82,000,000 | [3] | 148,000,000 | [3] | 46,000,000 | [3] | 14,000,000 | [3] | ||||||||
| Impact of changes in the Home Price Index | 4,000,000 | [3] | (123,000,000) | [3] | (7,000,000) | [3] | (202,000,000) | [3] | ||||||||
| Impact of changes to the prepayment model | [3] | 228,000,000 | [3] | 160,000,000 | [3] | 403,000,000 | [3] | |||||||||
| Other model changes | (25,000,000) | [3],[4] | (33,000,000) | [3],[4] | (111,000,000) | [3],[4] | 107,000,000 | [3],[4] | ||||||||
| Balance, end of period | 4,368,000,000 | 5,827,000,000 | 4,368,000,000 | 5,827,000,000 | ||||||||||||
| Mortgage loans serviced for investors (in billions) | 521,000,000,000 | 759,000,000,000 | 521,000,000,000 | 759,000,000,000 | ||||||||||||
| Option adjusted spread due to MSR model recalibration | $ 31,000,000 | $ 127,000,000 | ||||||||||||||
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