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Business Segment Information - Consolidated Assets (Details) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2012
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Dec. 31, 2011
|
Sep. 30, 2011
|
|---|---|---|---|
| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | $ 2,166,162 | $ 2,129,046 | $ 2,219,628 |
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Operating Segments [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 1,902,195 | 1,883,663 | |
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ALM activities, including securities portfolio [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 634,209 | 653,131 | |
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Equity investments [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 5,521 | 14,737 | |
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Liquidating businesses [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 27,166 | 38,136 | |
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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 | (538,980) | (489,548) | |
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Other [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | $ 136,051 | $ 119,509 |