v2.4.0.6
Guarantees, Pledged Assets and Collateral Textuals (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Guarantees (Textuals) [Abstract]    
Maximum exposure to loss $ 59,867,000,000 $ 61,600,000,000
Collateral 454,000,000 443,000,000
Securities Loaned 443,000,000 436,000,000
Percentage share of losses owed on loans and MHFS sold with recourse Primarily all of these programs and arrangements require that we share in the loans’ credit exposure for their remaining life by providing recourse to the GSE, up to 33.33% of actual losses incurred on a pro-rata basis.  
Pledged collateral assets related to consolidated VIEs 13,200,000,000 14,600,000,000
Securities owned and pledged as collateral related to repurchase agreements not available to be repledged, Fair Value 9,600,000,000 9,100,000,000
Net amounts in consolidated balance sheet 48,059,000,000 43,286,000,000
Non-cash collateral received, fair value 52,000,000,000 46,600,000,000
Collateral received with the right to sell or repledge 52,000,000,000 46,600,000,000
Collateral sold or repledged 34,000,000,000 29,700,000,000
Non-cash collateral pledged, fair value 41,000,000,000 36,400,000,000
Fed Funds Sold, Securities Purchased under Resale Agreements and Other Short-Term Investments [Member]
   
Guarantees (Textuals) [Abstract]    
Net amounts in consolidated balance sheet 37,600,000,000 33,800,000,000
Loans [Member]
   
Guarantees (Textuals) [Abstract]    
Net amounts in consolidated balance sheet 10,500,000,000 9,500,000,000
Direct pay letters of credit (DPLCs) [Member]
   
Guarantees (Textuals) [Abstract]    
Maximum exposure to loss 18,200,000,000 18,500,000,000
Third party clearing indemnifications [Member]
   
Guarantees (Textuals) [Abstract]    
Maximum exposure to loss 2,700,000,000  
Third-party clearing customer obligations 741,000,000  
Collateral provided to third-party clearing agents 3,600,000,000  
Securities lending and other indemnifications [Member]
   
Guarantees (Textuals) [Abstract]    
Maximum exposure to loss 3,131,000,000 2,541,000,000
Guarantor Obligations, Term These arrangements are for an indefinite period of time whereby we indemnify our clients against default by the borrower in returning these lent securities. This indemnity is supported by collateral received from the borrowers and is generally in the form of cash or highly liquid securities that are marked to market daily.  
Loans and MHFS sold with recourse [Member]
   
Guarantees (Textuals) [Abstract]    
Loans repurchased 11,000,000  
Trading assets and other [Member]
   
Guarantees (Textuals) [Abstract]    
Securities owned and pledged as collateral available to be repledged, Fair Value 31,400,000,000 27,400,000,000
Available for sale Securities [Member]
   
Guarantees (Textuals) [Abstract]    
Securities owned and pledged as collateral related to repurchase agreements not available to be repledged, Fair Value $ 8,600,000,000 $ 8,400,000,000