Quarterly report pursuant to Section 13 or 15(d)

Commitments, Contingencies and Guarantees - Commitments (Details)

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Commitments, Contingencies and Guarantees - Commitments (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]          
Litigation-related expenses $ 13,000,000 $ 216,000,000 $ 17,000,000 $ 279,000,000  
Loss Contingency, Range of Possible Loss, Minimum 0   0    
Loss Contingency, Range of Possible Loss, Maximum 1,300,000,000   1,300,000,000    
Lending Commitment Maturities [Abstract]          
Lending commitments, total 5,494,000,000   5,494,000,000    
Lending commitments, Less than 1 year 1,867,000,000   1,867,000,000    
Lending commitments, 1-3 years 714,000,000   714,000,000    
Lending commitments, 3-5 years 2,608,000,000   2,608,000,000    
Lending commitments, Over 5 years 305,000,000   305,000,000    
Purchasing and Other Commitment Maturities [Abstract]          
Purchasing and other commitments, total 4,652,000,000   4,652,000,000    
Purchasing and other commitments, Less than 1 year 2,767,000,000   2,767,000,000    
Purchasing and other commitments, 1-3 years 871,000,000   871,000,000    
Purchasing and other commitments, 3-5 years 673,000,000   673,000,000    
Purchasing and other commitments, Over 5 years 341,000,000   341,000,000    
Operating Lease Maturities [Abstract]          
Operating leases, total 2,643,000,000   2,643,000,000    
Operating leases, Less than 1 year 744,000,000   744,000,000    
Operating leases, 1-3 years 881,000,000   881,000,000    
Operating leases, 3-5 years 540,000,000   540,000,000    
Operating leases, Over 5 years 478,000,000   478,000,000    
Resale and Securities Borrowing Agreement Commitment Maturities [Abstract]          
Commitments to enter into resale and securities borrowing agreements, total 95,727,000,000   95,727,000,000    
Commitments to enter into resale and securities borrowing agreements, Less than 1 year 95,727,000,000   95,727,000,000    
Commitments to enter into resale and securities borrowing agreements, 1-3 years 0   0    
Commitments to enter into resale and securities borrowing agreements, 3-5 years 0   0    
Commitments to enter into resale and securities borrowing agreements, Over 5 years 0   0    
Repurchase and Securities Lending Agreement Commitment Maturities [Abstract]          
Commitments to enter into repurchase and securities lending agreements, total 39,904,000,000   39,904,000,000    
Commitments to enter into repurchase and securities lending agreements, Less than 1 year 39,904,000,000   39,904,000,000    
Commitments to enter into repurchase and securities lending agreements, 1-3 years 0   0    
Commitments to enter into repurchase and securities lending agreements, 3-5 years 0   0    
Commitments to enter into repurchase and securities lending agreements, Over 5 years 0   0    
Contractual Obligation Maturities [Abstract]          
Total contractual obligations 148,420,000,000   148,420,000,000    
Total contractual obligations, Less than 1 year 141,009,000,000   141,009,000,000    
Total contractual obligations, 1-3 years 2,466,000,000   2,466,000,000    
Total contractual obligations, 3-5 years 3,821,000,000   3,821,000,000    
Total contractual obligations, Over 5 years 1,124,000,000   1,124,000,000    
Commitments to purchase partnership interests 200,000,000   200,000,000   300,000,000
Inactive Claims, Threshold Period of Inactivity after Denial     6 months    
Minimum fee commitments 1,300,000,000   1,300,000,000   1,500,000,000
Commitments to purchase loans 2,200,000,000   2,200,000,000   2,500,000,000
Other purchasing commitments 1,000,000,000   1,000,000,000   1,000,000,000
Commitment to enter contingent forward-dated resale agreement for U.S. agency MBS $ 1,200,000,000   $ 1,200,000,000