Quarterly report pursuant to Section 13 or 15(d)

Investment Securities (Details)

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Investment Securities (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Investment Securities [Abstract]          
Available-for-sale $ 699 [1]   $ 699 [1]   $ 694
Equity investments 3,070   3,070   3,810
Other investments 2,540   2,540   2,180
Total 6,309   6,309   6,684
Available-for-sale, fair value 699 [1]   699 [1]   694
Other than Temporary Impairment Losses, Investments [Abstract]          
OTTI losses related to non-agency mortgage-backed AFS securities 4 10 6 46  
OTTI losses for AFS debt securities that Merrill Lynch does not intend to hold to recovery 4 8 6 44  
Corporate Asset Backed and Non-agency Mortgage Backed Securities [Member]
         
Investment Securities [Abstract]          
Available-for-sale 295   295   296
Available-for-sale, fair value 295   295   296
Corporate ABS
         
Investment Securities [Abstract]          
Available-for-sale 238   238   47
Available-for-sale, fair value 238   238   47
Non-agency mortgage backed securities
         
Investment Securities [Abstract]          
Available-for-sale 57   57   249
Available-for-sale, fair value 57   57   249
Other than Temporary Impairment Losses, Investments [Abstract]          
OTTI losses related to non-agency mortgage-backed AFS securities 4 10 6 46  
U.S. Government and agencies
         
Investment Securities [Abstract]          
Available-for-sale 404   404   398
Available-for-sale, fair value $ 404   $ 404   $ 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.