Annual report pursuant to Section 13 and 15(d)

Commitments, Contingencies and Guarantees - Commitments (Details)

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Commitments, Contingencies and Guarantees - Commitments (Details) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended 36 Months Ended 48 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 36 Months Ended
Nov. 30, 2012
Dec. 31, 2008
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Nov. 30, 2012
Definitive Settlement Agreement [Member]
Dec. 31, 2007
AIG Litigation [Member]
offering
Dec. 31, 2008
Federal Housing Finance Agency [Member]
offering
Dec. 31, 2002
Gail A. Calahy, Et Al [Member]
Oct. 31, 2008
Mediafiction S.P.A. [Member]
Merrill Lynch International Bank Limited
Dec. 31, 1999
Mediafiction S.P.A. [Member]
Merrill Lynch International Bank Limited
Jul. 05, 2011
Rosen Capital Partners LP and Rosen Capital Institutional LP [Member]
Dec. 31, 2007
Minimum
AIG Litigation [Member]
Loss Contingency, Information about Litigation Matters [Abstract]                          
Legal fees     $ 358,000,000 $ 740,000,000                  
Aggregate range of possible loss, minimum     0                    
Aggregate range of possible loss, maximum     650,000,000                    
Damages awarded                 8,600,000     64,000,000  
2008 bonuses to Merrill Lynch employees   5,800,000,000                      
Litigaton settlement agreement           2,425,000,000              
Period for institution or continuation of corporate government enhancements 18 months                        
Notes issued by counterparty                     284,000,000    
Damages sought                   137,000,000     10,000,000,000
Number of offerings included in complaint             158            
Number of private placement offerings included in complaint             2            
Number of issued offerings included in complaint               23          
Number of underwritten offerings included in complaint               72          
Lending Commitment Maturities [Abstract]                          
Lending commitments, total     5,248,000,000                    
Lending commitments, Less than 1 year     1,556,000,000                    
Lending commitments, 1-3 years     1,260,000,000                    
Lending commitments, 3-5 years     2,306,000,000                    
Lending commitments, Over 5 years     126,000,000                    
Purchasing and Other Commitment Maturities [Abstract]                          
Purchasing and other commitments, total     3,405,000,000                    
Purchasing and other commitments, Less than 1 year     1,586,000,000                    
Purchasing and other commitments, 1-3 years     962,000,000                    
Purchasing and other commitments, 3-5 years     636,000,000                    
Purchasing and other commitments, Over 5 years     221,000,000                    
Operating Lease Maturities [Abstract]                          
Operating leases, total     3,139,000,000                    
Operating leases, less than 1 year     736,000,000                    
Operating leases, 1-3 years     951,000,000                    
Operating leases, 3-5 years     693,000,000                    
2018 and thereafter     759,000,000                    
Resale and Securities Borrowing Agreement Commitment Maturities [Abstract]                          
Commitments to enter into resale and securities borrowing agreements, total     66,884,000,000                    
Commitments to enter into resale and securities borrowing agreements, Less than 1 year     66,884,000,000                    
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     42,333,000,000                    
Commitments to enter into repurchase and securities lending agreements, Less than 1 year     42,333,000,000                    
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     121,009,000,000                    
Total contractual obligations, Less than 1 year     113,095,000,000                    
Total contractual obligations, 1-3 years     3,173,000,000                    
Total contractual obligations, 3-5 years     3,635,000,000                    
Total contractual obligations, Over 5 years     1,106,000,000                    
Commitments to purchase loans     1,300,000,000 2,500,000,000                  
Minimum fee commitments     1,200,000,000 1,500,000,000                  
Other purchasing commitments     800,000,000 1,000,000,000                  
Commitments to purchase partnership interests     100,000,000 300,000,000                  
Leases, Operating [Abstract]                          
Operating leases, less than 1 year     736,000,000                    
2014     506,000,000                    
2015     445,000,000                    
2016     388,000,000                    
2017     305,000,000                    
2018 and thereafter     759,000,000                    
Operating leases, total     3,139,000,000                    
Operating Leases, Rent Expense, Net [Abstract]                          
Rent expense     752,000,000 821,000,000 838,000,000                
Sublease revenue     (89,000,000) (98,000,000) (137,000,000)                
Net rent expense     $ 663,000,000 $ 723,000,000 $ 701,000,000