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Derivatives - Net Investment and Economic Hedges (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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| Net gains (losses) on economic hedges [Abstract] | ||||||||||||
| Interest rate risk | $ 6 | [1] | $ 182 | [1] | $ 17 | [1] | $ 178 | [1] | ||||
| Foreign currency risk | 48 | [1] | (2,350) | [1] | (456) | [1] | 796 | [1] | ||||
| Credit risk | (22) | [1] | 65 | [1] | (53) | [1] | 48 | [1] | ||||
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Foreign Exchange Risk [Member]
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| Net investment hedges of foreign operations [Abstract] | ||||||||||||
| Hedge Ineffectivenes and Amounts Excluded from Effectiveness Testing | 12 | [2] | (110) | [2] | (86) | [2] | (267) | [2] | ||||
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Net Investment Hedging [Member] | Foreign Exchange Risk [Member]
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| Net investment hedges of foreign operations [Abstract] | ||||||||||||
| Gains (losses) Recognized in Accumulated OCI | (567) | 1,215 | (457) | 254 | ||||||||
| Gains (losses) in Income Reclassified from Accumulated OCI | (12) | [2] | (18) | [2] | (49) | [2] | (21) | [2] | ||||
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Trading Account Assets [Member] | Net Investment Hedging [Member] | Designated as Hedging Instrument [Member]
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| Net investment hedges of foreign operations [Abstract] | ||||||||||||
| Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value | 175 | 690 | 175 | 690 | ||||||||
| Notional Amount of Derivative Instruments Designated as Net Investment Hedges | 3,328 | 20,068 | 3,328 | 20,068 | ||||||||
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Trading Liabilities [Member] | Net Investment Hedging [Member] | Designated as Hedging Instrument [Member]
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| Net investment hedges of foreign operations [Abstract] | ||||||||||||
| Derivative Instruments in Hedges, Net Investment in Foreign Operations, Liabilities, Fair Value | 794 | 492 | 794 | 492 | ||||||||
| Notional Amount of Derivative Instruments Designated as Net Investment Hedges | 19,560 | 7,338 | 19,560 | 7,338 | ||||||||
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Long-term Borrowings [Member] | Net Investment Hedging [Member] | Designated as Hedging Instrument [Member]
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| Net investment hedges of foreign operations [Abstract] | ||||||||||||
| Derivative Instruments in Hedges, Net Investment in Foreign Operations, Liabilities, Fair Value | $ 0 | $ 61 | $ 0 | $ 61 | ||||||||
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