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Mortgage Banking Activities, Liability for Mortgage Loan Repurchase Losses (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
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| Liability For Mortgage Loan Repurchase Losses [Abstract] | |||
| Balance, beginning of year | $ 1,326 | $ 1,289 | $ 1,033 |
| Loan sales | 275 | 101 | 144 |
| Change in estimate | 1,665 | 1,184 | 1,474 |
| Total additions | 1,940 | 1,285 | 1,618 |
| Losses | (1,060) | (1,248) | (1,362) |
| Balance, end of year | $ 2,206 | $ 1,326 | $ 1,289 |