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
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Investment Securities [Abstract]      
Available-for-sale, amortized cost $ 615 [1]   $ 656
Available-for-sale, fair value 615 [1]   656
Other Debt Securities Carried at Fair Value 7,512 [2]   7,722 [2]
Equity investments 2,080   2,627
Other investments 2,880   2,620
Total 13,087   13,625
Other than Temporary Impairment Losses, Investments [Abstract]      
OTTI losses related to non-agency mortgage-backed AFS securities 0 2  
OTTI losses for AFS debt securities that Merrill Lynch does not intend to hold to recovery 0 2  
Corporate Asset Backed and Non-agency Mortgage Backed Securities [Member]
     
Investment Securities [Abstract]      
Available-for-sale, amortized cost 212   266
Available-for-sale, fair value 212   266
Corporate ABS
     
Investment Securities [Abstract]      
Available-for-sale, amortized cost 175   226
Available-for-sale, fair value 175   226
Non-agency mortgage backed securities
     
Investment Securities [Abstract]      
Available-for-sale, amortized cost 37   40
Available-for-sale, fair value 37   40
Other than Temporary Impairment Losses, Investments [Abstract]      
OTTI losses related to non-agency mortgage-backed AFS securities 0 2  
U.S. Government and agencies
     
Investment Securities [Abstract]      
Available-for-sale, amortized cost 403   390
Available-for-sale, fair value $ 403   $ 390
[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.
[2] Certain assets that are used for liquidity management purposes were reclassified from Trading assets to Other debt securities carried at fair value during the three months ended March 31, 2013. Prior period amounts have also been reclassified to conform with the current period presentation.