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Commitments and Guarantees (Narrative) (Details) (USD $)
9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Financial Standby Letter of Credit [Member]
Sep. 30, 2012
Total Repurchase and Indemnification Claims [Member]
Residential Mortgages [Member]
Sep. 30, 2012
Recourse Obligations [Member]
Commercial Mortgage [Member]
Dec. 31, 2011
Recourse Obligations [Member]
Commercial Mortgage [Member]
Sep. 30, 2011
Recourse Obligations [Member]
Commercial Mortgage [Member]
Dec. 31, 2010
Recourse Obligations [Member]
Commercial Mortgage [Member]
Loss Contingencies [Line Items]              
Unfunded commitments - private equity investments $ 201,000,000            
Unfunded commitments - other investments 4,000,000            
Standby letters of credit and risk participations in standby letters of credit and bankers' acceptances - Terms outstanding - Minimum   1 year          
Standby letters of credit and risk participations in standby letters of credit and bankers' acceptances - Terms outstanding - Maximum   6 years          
Maximum Exposure   14,800,000,000   3,900,000,000 4,000,000,000    
Standby letters of credit and risk participations in standby letters of credit and bankers' acceptances - remarketing programs   7,500,000,000          
Standby letters of credit and risk participations in standby letters of credit and bankers' acceptances - Assets securing certain specifically identified standby letters of credit   1,700,000,000          
Standby letters of credit and risk participations in standby letters of credit and bankers' acceptances - recourse provisions from third parties   3,400,000,000          
Standby letters of credit and risk participations in standby letters of credit and bankers' acceptances - Liability carrying amount   258,000,000          
Standby bond purchase agreements to support municipal bond obligations 625,000,000            
Other liquidity facilities commitments 145,000,000            
Commercial mortgage recourse obligations - Unpaid principal balance of loans sold       12,900,000,000 13,000,000,000    
Reserves, Beginning balance       43,000,000 47,000,000 49,000,000 54,000,000
Reserves, Ending balance       43,000,000 47,000,000 49,000,000 54,000,000
Repurchase Potential Excess Loss Range Maxmium     $ 324,000,000