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 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Loss Contingencies [Line Items]          
Litigation-related expenses $ 170,000,000 $ 390,000,000 $ 190,000,000 $ 670,000,000  
Loss Contingency, Range of Possible Loss, Minimum 0   0    
Loss Contingency, Range of Possible Loss, Maximum 900,000,000   900,000,000    
Lending Commitment Maturities [Abstract]          
Lending commitments, total 4,707,000,000   4,707,000,000    
Lending commitments, Less than 1 year 915,000,000   915,000,000    
Lending commitments, 1-3 years 617,000,000   617,000,000    
Lending commitments, 3-5 years 2,921,000,000   2,921,000,000    
Lending commitments, Over 5 years 254,000,000   254,000,000    
Purchasing and Other Commitment Maturities [Abstract]          
Purchasing and other commitments, total 4,063,000,000   4,063,000,000    
Purchasing and other commitments, Less than 1 year 1,995,000,000   1,995,000,000    
Purchasing and other commitments, 1-3 years 1,108,000,000   1,108,000,000    
Purchasing and other commitments, 3-5 years 696,000,000   696,000,000    
Purchasing and other commitments, Over 5 years 264,000,000   264,000,000    
Operating Lease Maturities [Abstract]          
Operating leases, total 2,617,000,000   2,617,000,000    
Operating leases, Less than 1 year 786,000,000   786,000,000    
Operating leases, 1-3 years 828,000,000   828,000,000    
Operating leases, 3-5 years 540,000,000   540,000,000    
Operating leases, Over 5 years 463,000,000   463,000,000    
Resale and Securities Borrowing Agreement Commitment Maturities [Abstract]          
Commitments to enter into resale and securities borrowing agreements, total 98,340,000,000   98,340,000,000    
Commitments to enter into resale and securities borrowing agreements, Less than 1 year 98,340,000,000   98,340,000,000    
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 56,412,000,000   56,412,000,000    
Commitments to enter into repurchase and securities lending agreements, Less than 1 year 56,412,000,000   56,412,000,000    
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 166,139,000,000   166,139,000,000    
Total contractual obligations, Less than 1 year 158,448,000,000   158,448,000,000    
Total contractual obligations, 1-3 years 2,553,000,000   2,553,000,000    
Total contractual obligations, 3-5 years 4,157,000,000   4,157,000,000    
Total contractual obligations, Over 5 years 981,000,000   981,000,000    
Commitments to purchase partnership interests 100,000,000   100,000,000   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 1,700,000,000   1,700,000,000   2,500,000,000
Other purchasing commitments 1,000,000,000   1,000,000,000   1,000,000,000
Definitive Settlement Agreement [Member]
          
Loss Contingencies [Line Items]          
Litigation-related expenses $ 2,400,000,000