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Derivatives - Derivatives Designated as Accounting Hedges - Fair Value Hedges (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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| Effect of Fair Value Hedges on Results of Operations [Abstract] | ||||||||||
| Derivative | $ (1,644) | $ 2,125 | ||||||||
| Hedged Item | 1,384 | (2,233) | ||||||||
| Hedge Ineffectiveness | (260) | (108) | ||||||||
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Interest rate risk on long-terrn debt [Member] | Interest rate risk on long-term debt [Member]
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| Effect of Fair Value Hedges on Results of Operations [Abstract] | ||||||||||
| Derivative | (953) | [1] | (1,001) | [1] | ||||||
| Hedged Item | 771 | [1] | 764 | [1] | ||||||
| Hedge Ineffectiveness | (182) | [1] | (237) | [1] | ||||||
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Interest rate and foreign currency risk on long-term debt [Member] | Interest rate risk on long-term debt [Member]
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| Effect of Fair Value Hedges on Results of Operations [Abstract] | ||||||||||
| Derivative | (1,538) | [1] | 155 | [1] | ||||||
| Hedged Item | 1,456 | [1] | (173) | [1] | ||||||
| Hedge Ineffectiveness | (82) | [1] | (18) | [1] | ||||||
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Interest rate risk on AFS securities [Member] | Interest rate risk on AFS securities [Member]
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| Effect of Fair Value Hedges on Results of Operations [Abstract] | ||||||||||
| Derivative | 850 | [2] | 2,948 | [2] | ||||||
| Hedged Item | (846) | [2] | (2,801) | [2] | ||||||
| Hedge Ineffectiveness | 4 | [2] | 147 | [2] | ||||||
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Commodity price risk on commodity inventory [Member] | Commodity price risk on commodity inventory [Member]
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| Effect of Fair Value Hedges on Results of Operations [Abstract] | ||||||||||
| Derivative | (3) | [3] | 23 | [3] | ||||||
| Hedged Item | $ 3 | [3] | $ (23) | [3] | ||||||
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