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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Loss Contingencies [Line Items]          
Legal Fees $ 53,000,000 $ 13,000,000 $ 150,000,000 $ 17,000,000  
Loss Contingency, Range of Possible Loss, Minimum 0   0    
Loss Contingency, Range of Possible Loss, Maximum 610,000,000   610,000,000    
Lending Commitment Maturities [Abstract]          
Lending commitments, total 4,718,000,000   4,718,000,000    
Lending commitments, Less than 1 year 961,000,000   961,000,000    
Lending commitments, 1-3 years 1,656,000,000   1,656,000,000    
Lending commitments, 3-5 years 2,005,000,000   2,005,000,000    
Lending commitments, Over 5 years 96,000,000   96,000,000    
Purchasing and Other Commitment Maturities [Abstract]          
Purchasing and other commitments, total 3,418,000,000   3,418,000,000    
Purchasing and other commitments, Less than 1 year 1,987,000,000   1,987,000,000    
Purchasing and other commitments, 1-3 years 848,000,000   848,000,000    
Purchasing and other commitments, 3-5 years 435,000,000   435,000,000    
Purchasing and other commitments, Over 5 years 148,000,000   148,000,000    
Operating Lease Maturities [Abstract]          
Operating leases, total 3,285,000,000   3,285,000,000    
Operating leases, Less than 1 year 615,000,000   615,000,000    
Operating leases, 1-3 years 974,000,000   974,000,000    
Operating leases, 3-5 years 692,000,000   692,000,000    
Operating leases, Over 5 years 1,004,000,000   1,004,000,000    
Resale and Securities Borrowing Agreement Commitment Maturities [Abstract]          
Commitments to enter into resale and securities borrowing agreements, total 93,225,000,000   93,225,000,000    
Commitments to enter into resale and securities borrowing agreements, Less than 1 year 93,225,000,000   93,225,000,000    
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 58,872,000,000   58,872,000,000    
Commitments to enter into repurchase and securities lending agreements, Less than 1 year 58,872,000,000   58,872,000,000    
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 163,518,000,000   163,518,000,000    
Total contractual obligations, Less than 1 year 155,660,000,000   155,660,000,000    
Total contractual obligations, 1-3 years 3,478,000,000   3,478,000,000    
Total contractual obligations, 3-5 years 3,132,000,000   3,132,000,000    
Total contractual obligations, Over 5 years 1,248,000,000   1,248,000,000    
Commitments to purchase partnership interests 100,000,000   100,000,000   100,000,000
Minimum fee commitments 1,100,000,000   1,100,000,000   1,200,000,000
Other Commitment 200,000,000   200,000,000   800,000,000
Commitments to purchase loans $ 2,000,000,000   $ 2,000,000,000   $ 1,300,000,000