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Business Segment Information - Reconciliation of Revenue and Net Income (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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| Segment Reporting Revenue And Net Income Loss Reconciling Item [Line Items] | ||||||||
| Segments' total revenue, net of interest expense (FTE basis) | $ 22,949 | $ 22,202 | $ 46,357 | $ 44,687 | ||||
| Revenues | 22,727 | 21,968 | 45,924 | 44,246 | ||||
| Net income (loss) | 4,012 | 2,463 | 5,495 | 3,116 | ||||
| Liabilities, fair value adjustment | 10 | (62) | (80) | (3,400) | ||||
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Operating Segments [Member]
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| Segment Reporting Revenue And Net Income Loss Reconciling Item [Line Items] | ||||||||
| Segments' total revenue, net of interest expense (FTE basis) | 22,376 | 21,604 | 45,420 | 44,484 | ||||
| Net income (loss) | 3,463 | 2,827 | 5,918 | 6,087 | ||||
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ALM activities [Member]
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| Segment Reporting Revenue And Net Income Loss Reconciling Item [Line Items] | ||||||||
| Revenues | (94) | [1] | 477 | [1] | (410) | (692) | ||
| Net income (loss) | (166) | (229) | (677) | (2,052) | ||||
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Equity investment income [Member]
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| Segment Reporting Revenue And Net Income Loss Reconciling Item [Line Items] | ||||||||
| Revenues | 576 | (36) | 1,096 | 394 | ||||
| Net income (loss) | 363 | (23) | 690 | 248 | ||||
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Liquidating businesses [Member]
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| Segment Reporting Revenue And Net Income Loss Reconciling Item [Line Items] | ||||||||
| Revenues | 91 | 157 | 251 | 501 | ||||
| Net income (loss) | 352 | (112) | (436) | (1,167) | ||||
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FTE basis adjustment [Member]
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| Segment Reporting Revenue And Net Income Loss Reconciling Item [Line Items] | ||||||||
| Revenues | $ (222) | $ (234) | $ (433) | $ (441) | ||||
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