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Business Segment Information - Consolidated Assets (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2012
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Dec. 31, 2011
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Mar. 31, 2011
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| Segment Reporting, Asset Reconciling Item [Line Items] | ||||||
| Total assets | $ 2,181,449 | $ 2,129,046 | $ 2,274,532 | [1] | ||
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Operating Segments [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | ||||||
| Total assets | 1,870,177 | 1,921,120 | ||||
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ALM activities, including securities portfolio [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | ||||||
| Total assets | 625,704 | 641,975 | ||||
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Equity investments [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | ||||||
| Total assets | 6,080 | 35,146 | ||||
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Liquidating businesses [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | ||||||
| Total assets | 29,205 | 42,706 | ||||
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Elimination of segment excess asset allocations to match liabilities [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | ||||||
| Total assets | (519,910) | (495,772) | ||||
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Other [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | ||||||
| Total assets | $ 170,193 | $ 129,357 | ||||
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