Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Intangible Assets (Details)

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Goodwill and Intangible Assets - Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Intangible Assets [Line Items]      
Accumulated amortization $ (1,235) $ (928)  
Gross carrying amount 4,602 4,602  
Net carrying amount 3,367 3,674  
Estimated Future Amortization Expense [Abstract]      
Amortization expense 307 309 309
2013 309    
2014 309    
2015 309    
2016 309    
2017 309    
Other [Member]
      
Schedule of Intangible Assets [Line Items]      
Other Intangible Assets 1,515 [1] 1,515 [1]  
Customer Relationships [Member]
      
Schedule of Intangible Assets [Line Items]      
Gross carrying amount 3,087 3,087  
Accumulated amortization (1,235) (928)  
Net carrying amount $ 1,852 $ 2,159  
[1] Represents value assigned to the Merrill Lynch brand.