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Derivatives - Derivatives Designated as Accounting Hedges - Fair Value Hedges (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |||||||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Effect of Fair Value Hedges on Results of Operations [Abstract] | ||||||||||||
| Derivative | $ (6,206) | $ (69) | $ (3,186) | |||||||||
| Hedged Item | 4,448 | (718) | 2,134 | |||||||||
| Hedge Ineffectiveness | (1,758) | (787) | (1,052) | |||||||||
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Interest Rate Risk On Long Tern Debt [Member] | Interest Expense [Member]
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| Effect of Fair Value Hedges on Results of Operations [Abstract] | ||||||||||||
| Derivative | 4,384 | [1] | 2,952 | [1] | (4,858) | [1] | ||||||
| Hedged Item | (4,969) | [1] | (3,496) | [1] | 4,082 | [1] | ||||||
| Hedge Ineffectiveness | (585) | [1] | (544) | [1] | (776) | [1] | ||||||
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Interest Rate and Foreign Currency Risk on Long Term Debt [Member] | Interest Expense [Member]
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| Effect of Fair Value Hedges on Results of Operations [Abstract] | ||||||||||||
| Derivative | 780 | [1] | (463) | [1] | 932 | [1] | ||||||
| Hedged Item | (1,057) | [1] | 130 | [1] | (858) | [1] | ||||||
| Hedge Ineffectiveness | (277) | [1] | (333) | [1] | 74 | [1] | ||||||
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Interest Rate Risk on Available For Sale Securities [Member] | Interest Income [Member]
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| Effect of Fair Value Hedges on Results of Operations [Abstract] | ||||||||||||
| Derivative | (11,386) | [2] | (2,577) | [2] | 791 | [2] | ||||||
| Hedged Item | 10,490 | [2] | 2,667 | [2] | (1,141) | [2] | ||||||
| Hedge Ineffectiveness | (896) | [2] | 90 | [2] | (350) | [2] | ||||||
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Commodity Contract [Member] | Trading Account Profits (Losses) [Member]
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| Effect of Fair Value Hedges on Results of Operations [Abstract] | ||||||||||||
| Derivative | 16 | [3] | 19 | [3] | (51) | [3] | ||||||
| Hedged Item | $ (16) | [3] | $ (19) | [3] | $ 51 | [3] | ||||||
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