|
Business Segment Information - Consolidated Assets (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2013
|
Dec. 31, 2012
|
Mar. 31, 2012
|
|---|---|---|---|
| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | $ 2,174,819 | $ 2,209,974 | $ 2,181,449 |
|
Operating Segments [Member]
|
|||
| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 1,952,504 | 1,839,916 | |
|
ALM activities, including securities portfolio [Member]
|
|||
| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 693,498 | 641,385 | |
|
Equity investments [Member]
|
|||
| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 4,858 | 6,182 | |
|
Liquidating businesses [Member]
|
|||
| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | 29,496 | 35,954 | |
|
Elimination of segment excess asset allocations to match liabilities [Member]
|
|||
| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | (552,838) | (496,391) | |
|
Other [Member]
|
|||
| Segment Reporting, Asset Reconciling Item [Line Items] | |||
| Total assets | $ 47,301 | $ 154,403 |