v2.4.0.6
Guarantees, Pledged Assets and Collateral Textuals (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Guarantees (Textuals) [Abstract]    
Collateral $ 592,000,000 $ 687,000,000
Securities Loaned 584,000,000 669,000,000
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  
Residual Value Guarantee, Reimbursement Terms To the extent that a sale of the leased assets results in proceeds less than a stated percent (generally 80% to 89%) of the asset’s cost, we would be required to reimburse the lessor under our guarantee.  
Securities owned and pledged as collateral not available to be repledged, Fair Value 395,727,000,000 398,282,000,000
Collateral received with the right to sell or repledge 21,800,000,000 17,800,000,000
Collateral sold or repledged 20,700,000,000 16,700,000,000
Trading and Available-for-Sale Securities [Member]
    
Guarantees (Textuals) [Abstract]    
Securities owned and pledged as collateral available to be repledged, Fair Value 24,800,000,000 20,800,000,000
Securities owned and pledged as collateral not available to be repledged, Fair Value 733,000,000 2,800,000,000
Loans and MHFS sold with recourse [Member]
    
Guarantees (Textuals) [Abstract]    
Loans repurchased $ 6,000,000