Annual report pursuant to Section 13 and 15(d)

Investment Securities (Details)

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Investment Securities (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Investment Securities [Abstract]      
Available-for-sale, amortized cost $ 656 [1] $ 694  
Available-for-sale, fair value 656 [1] 694  
Equity investments 2,627 3,810  
Other investments 2,620 2,180  
Total 5,903 6,684  
Other than Temporary Impairment Losses, Investments [Abstract]      
OTTI losses related to non-agency mortgage-backed AFS securities 6 69 174
OTTI losses for AFS debt securities that Merrill Lynch does not intend to hold to recovery 6 59 172
Corporate Asset Backed and Non-agency Mortgage Backed Securities [Member]
     
Investment Securities [Abstract]      
Available-for-sale, amortized cost 266 296  
Available-for-sale, fair value 266 296  
Corporate ABS
     
Investment Securities [Abstract]      
Available-for-sale, amortized cost 226 47  
Available-for-sale, fair value 226 47  
Non-agency mortgage backed securities
     
Investment Securities [Abstract]      
Available-for-sale, amortized cost 40 249  
Available-for-sale, fair value 40 249  
Other than Temporary Impairment Losses, Investments [Abstract]      
OTTI losses related to non-agency mortgage-backed AFS securities 6 69 174
U.S. Government and agencies
     
Investment Securities [Abstract]      
Available-for-sale, amortized cost 390 398  
Available-for-sale, fair value $ 390 $ 398  
[1] Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay their obligations with or without prepayment penalties.