Quarterly report pursuant to Section 13 or 15(d)

Business Segment Information - Consolidated Assets (Details)

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Business Segment Information - Consolidated Assets (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets $ 2,181,449 $ 2,129,046 $ 2,274,532 [1]
Operating Segments [Member]
     
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets 1,870,177   1,921,120
ALM activities, including securities portfolio [Member]
     
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets 625,704   641,975
Equity investments [Member]
     
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets 6,080   35,146
Liquidating businesses [Member]
     
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets 29,205   42,706
Elimination of segment excess asset allocations to match liabilities [Member]
     
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets (519,910)   (495,772)
Other [Member]
     
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets $ 170,193   $ 129,357
[1] There were no material intersegment revenues.