|
Securities - Realized Gains and Losses (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2012
|
Sep. 30, 2011
|
Sep. 30, 2012
|
Sep. 30, 2011
|
|
| Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] | ||||
| Net gains on sales of debt securities | $ 339 | $ 737 | $ 1,491 | $ 2,182 |
|
Debt Securities [Member]
|
||||
| Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] | ||||
| Gross Gains | 361 | 745 | 1,957 | 2,200 |
| Gross Losses | (22) | (8) | (466) | (18) |
| Net gains on sales of debt securities | 339 | 737 | 1,491 | 2,182 |
| Income tax expense attributable to realized net gains on sales of AFS debt securities | $ 125 | $ 273 | $ 552 | $ 807 |
| X | ||||||||||
|
- Definition
Income tax expense attributable to realized net gains on sales on debt securities. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The difference between the carrying value and the sale price of debt securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|