|
Business Segment Information - Consolidated Assets (Details) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2013
|
Dec. 31, 2012
|
Sep. 30, 2012
|
|---|---|---|---|
| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | $ 2,126,653 | $ 2,209,974 | $ 2,166,162 |
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Operating Segments [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 1,948,784 | 1,872,589 | |
|
ALM activities, including securities portfolio [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 662,206 | 677,585 | |
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Equity investments [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 2,625 | 5,626 | |
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Liquidating businesses [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 70,991 | 124,053 | |
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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 | $ (557,953) | $ (513,691) |