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Business Segment Information - Reconciliation of Revenue and Net Income (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 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) | $ 21,743 | $ 20,657 | $ 68,100 | $ 65,344 | ||||
| Revenues | 21,530 | 20,428 | 67,454 | 64,674 | ||||
| Net income (loss) | 2,497 | 340 | 7,992 | 3,456 | ||||
| Liabilities, fair value adjustment | (152) | (1,300) | (232) | (4,700) | ||||
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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) | 20,876 | 21,491 | 66,295 | 65,975 | ||||
| Net income (loss) | 1,854 | 1,940 | 7,779 | 8,035 | ||||
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ALM activities [Member]
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| Segment Reporting Revenue And Net Income Loss Reconciling Item [Line Items] | ||||||||
| Revenues | (180) | [1] | (930) | [1] | (590) | (1,623) | ||
| Net income (loss) | (71) | (1,156) | (748) | (3,209) | ||||
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Equity investment income [Member]
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| Segment Reporting Revenue And Net Income Loss Reconciling Item [Line Items] | ||||||||
| Revenues | 1,121 | 172 | 2,217 | 566 | ||||
| Net income (loss) | 706 | 108 | 1,397 | 357 | ||||
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Liquidating businesses [Member]
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| Segment Reporting Revenue And Net Income Loss Reconciling Item [Line Items] | ||||||||
| Revenues | (74) | (76) | 178 | 426 | ||||
| Net income (loss) | 8 | (552) | (436) | (1,727) | ||||
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FTE basis adjustment [Member]
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| Segment Reporting Revenue And Net Income Loss Reconciling Item [Line Items] | ||||||||
| Revenues | $ (213) | $ (229) | $ (646) | $ (670) | ||||
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