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Securities - Realized Gains and Losses (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
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Mar. 31, 2013
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Mar. 31, 2012
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| Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] | ||
| Net gains on sales of debt securities | $ 68 | $ 752 |
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Debt Securities [Member]
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| Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] | ||
| Gross Gains | 69 | 1,173 |
| Gross Losses | (1) | (421) |
| Net gains on sales of debt securities | 68 | 752 |
| Income tax expense attributable to realized net gains on sales of AFS debt securities | $ 25 | $ 278 |
| X | ||||||||||
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- Definition
Income tax expense attributable to realized net gains on sales on debt securities. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- 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
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| X | ||||||||||
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- 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
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| X | ||||||||||
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- 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
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