|
Business Segment Information - Consolidated Assets (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2013
|
Dec. 31, 2012
|
Jun. 30, 2012
|
|---|---|---|---|
| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | $ 2,123,320 | $ 2,209,974 | $ 2,160,854 |
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Operating Segments [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 1,917,344 | 1,834,446 | |
|
ALM activities, including securities portfolio [Member]
|
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| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 659,623 | 641,210 | |
|
Equity investments [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 4,172 | 5,546 | |
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Liquidating businesses [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 72,508 | 181,802 | |
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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 | $ (530,327) | $ (502,150) |