v2.4.0.6
Goodwill and Net Intangible Assets (Changes in Carrying Amount of Intangible Assets) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Intangible Assets [Line Items]      
Amortizable net intangible assets, beginning balance $ 3,872 $ 4,230  
Foreign currency translation adjustments and other 6 (10)  
Amortization expense (340) (345)  
Impairment losses (4) [1] (7)  
Increase due to Smith Barney trade name 280 [2]    
Intangible assets acquired during the period 4 5  
Intangible assets disposed of during the period (42) [3] (1)  
Amortizable net intangible assets, ending balance 3,776 3,872  
Mortgage servicing rights 7 133 157
Indefinite-lived intangible assets   280 280
Net intangible assets 3,783 4,285 4,667
Institutional Securities
      
Intangible Assets [Line Items]      
Amortizable net intangible assets, beginning balance 229 262  
Foreign currency translation adjustments and other 5 (10)  
Amortization expense (17) (23)  
Impairment losses (4) [1] (4)  
Increase due to Smith Barney trade name 0 [2]    
Intangible assets acquired during the period 4 5  
Intangible assets disposed of during the period (42) [3] (1)  
Amortizable net intangible assets, ending balance 175 229  
Mortgage servicing rights 0 122 151
Indefinite-lived intangible assets   0 0
Net intangible assets 175 351 413
Global Wealth Management Group
      
Intangible Assets [Line Items]      
Amortizable net intangible assets, beginning balance 3,641 3,963  
Foreign currency translation adjustments and other 1 0  
Amortization expense (322) (322)  
Impairment losses 0 [1] 0  
Increase due to Smith Barney trade name 280 [2]    
Intangible assets acquired during the period 0 0  
Intangible assets disposed of during the period 0 [3] 0  
Amortizable net intangible assets, ending balance 3,600 3,641  
Mortgage servicing rights 7 11 6
Indefinite-lived intangible assets   280 280
Net intangible assets 3,607 3,932 4,249
Asset Management
      
Intangible Assets [Line Items]      
Amortizable net intangible assets, beginning balance 2 5  
Foreign currency translation adjustments and other 0 0  
Amortization expense (1) 0  
Impairment losses 0 [1] (3)  
Increase due to Smith Barney trade name 0 [2]    
Intangible assets acquired during the period 0 0  
Intangible assets disposed of during the period 0 [3] 0  
Amortizable net intangible assets, ending balance 1 2  
Mortgage servicing rights 0 0 0
Indefinite-lived intangible assets   0 0
Net intangible assets $ 1 $ 2 $ 5
[1] Impairment losses are recorded within Other expenses in the consolidated statements of income.
[2] The Global Wealth Management Group business segment activity represents the reclassification of $280 million from an indefinite-lived to a finite-lived intangible asset (see Note 2).
[3] The Institutional Securities business segment activity represents intangible assets disposed of in connection with the sale of a principal investment.