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
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Loss Contingencies [Line Items]      
Legal Fees $ 97,000,000 $ 4,000,000  
Loss Contingency, Range of Possible Loss, Minimum 0    
Loss Contingency, Range of Possible Loss, Maximum 630,000,000    
Lending Commitment Maturities [Abstract]      
Lending commitments, total 5,013,000,000    
Lending commitments, Less than 1 year 1,134,000,000    
Lending commitments, 1-3 years 1,761,000,000    
Lending commitments, 3-5 years 2,003,000,000    
Lending commitments, Over 5 years 115,000,000    
Purchasing and Other Commitment Maturities [Abstract]      
Purchasing and other commitments, total 3,650,000,000    
Purchasing and other commitments, Less than 1 year 1,878,000,000    
Purchasing and other commitments, 1-3 years 1,017,000,000    
Purchasing and other commitments, 3-5 years 571,000,000    
Purchasing and other commitments, Over 5 years 184,000,000    
Operating Lease Maturities [Abstract]      
Operating leases, total 3,257,000,000    
Operating leases, Less than 1 year 674,000,000    
Operating leases, 1-3 years 962,000,000    
Operating leases, 3-5 years 698,000,000    
Operating leases, Over 5 years 923,000,000    
Resale and Securities Borrowing Agreement Commitment Maturities [Abstract]      
Commitments to enter into resale and securities borrowing agreements, total 86,243,000,000    
Commitments to enter into resale and securities borrowing agreements, Less than 1 year 86,243,000,000    
Commitments to enter into resale and securities borrowing agreements, 1-3 years 0    
Commitments to enter into resale and securities borrowing agreements, 3-5 years 0    
Commitments to enter into resale and securities borrowing agreements, Over 5 years 0    
Repurchase and Securities Lending Agreement Commitment Maturities [Abstract]      
Commitments to enter into repurchase and securities lending agreements, total 56,906,000,000    
Commitments to enter into repurchase and securities lending agreements, Less than 1 year 56,906,000,000    
Commitments to enter into repurchase and securities lending agreements, 1-3 years 0    
Commitments to enter into repurchase and securities lending agreements, 3-5 years 0    
Commitments to enter into repurchase and securities lending agreements, Over 5 years 0    
Contractual Obligation Maturities [Abstract]      
Total contractual obligations 155,069,000,000    
Total contractual obligations, Less than 1 year 146,835,000,000    
Total contractual obligations, 1-3 years 3,740,000,000    
Total contractual obligations, 3-5 years 3,272,000,000    
Total contractual obligations, Over 5 years 1,222,000,000    
Commitments to purchase partnership interests 100,000,000   100,000,000
Minimum fee commitments 1,200,000,000   1,200,000,000
Other Commitment 700,000,000   800,000,000
Commitments to purchase loans $ 1,700,000,000   $ 1,300,000,000