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Mortgage Banking Activities, Liability for Mortgage Loan Repurchase Losses (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
|
| Liability For Mortgage Loan Repurchase Losses [Abstract] | ||||
| Balance, beginning of period | $ 2,317 | $ 1,444 | $ 2,206 | $ 1,326 |
| Provision for repurchase losses: | ||||
| Loan sales | 40 | 72 | 99 | 134 |
| Change in estimate | 25 | 597 | 275 | 965 |
| Total additions | 65 | 669 | 374 | 1,099 |
| Losses | (160) | (349) | (358) | (661) |
| Balance, end of period | $ 2,222 | $ 1,764 | $ 2,222 | $ 1,764 |