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Fair Value Measurements - Gains and Losses (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Equity Investment Income (Loss) $ 2 $ 10
Trading Account Profits (Losses) 251 (1,281)
Mortgage Banking Income (Loss) 871 [1] 1,273 [1]
Other Income (Loss) (449) 72
Total 675 74
Level 3 Changes in Unrealized Gains (Losses) Relating to Assets Still Held at Reporting Date    
Equity Investment Income (Loss) (15) (19)
Trading Account Profits (Losses) 73 (1,310)
Mortgage Banking Income (Loss) 629 [1] 827 [1]
Other Income (Loss) (467) 53
Total 220 (449)
Trading Account Assets [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Equity Investment Income (Loss) 0  
Trading Account Profits (Losses) 343 231
Mortgage Banking Income (Loss) 0 [1]  
Other Income (Loss) 0  
Total 343 231
Level 3 Changes in Unrealized Gains (Losses) Relating to Assets Still Held at Reporting Date    
Equity Investment Income (Loss) 0 0
Trading Account Profits (Losses) 221 133
Mortgage Banking Income (Loss) 0 [1] 0 [1]
Other Income (Loss) 0 0
Total 221 133
Corporate securities, trading loans and other [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Trading Account Profits (Losses) 88 93
Total 88 93
Level 3 Changes in Unrealized Gains (Losses) Relating to Assets Still Held at Reporting Date    
Equity Investment Income (Loss)      
Trading Account Profits (Losses) 48 56
Mortgage Banking Income (Loss)    [1]    [1]
Other Income (Loss)       [2]
Total 48 56 [2]
Equity securities [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Trading Account Profits (Losses) 42 15
Total 42 15
Level 3 Changes in Unrealized Gains (Losses) Relating to Assets Still Held at Reporting Date    
Equity Investment Income (Loss)      
Trading Account Profits (Losses) 33 11
Mortgage Banking Income (Loss)    [1]    [1]
Other Income (Loss)      
Total 33 11
Non-U.S. sovereign debt [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Trading Account Profits (Losses) 51 24
Total 51 24
Level 3 Changes in Unrealized Gains (Losses) Relating to Assets Still Held at Reporting Date    
Equity Investment Income (Loss)      
Trading Account Profits (Losses) 51 13
Mortgage Banking Income (Loss)    [1]    [1]
Other Income (Loss)      
Total 51 13
Mortgage trading loans and ABS [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Trading Account Profits (Losses) 162 99
Total 162 99
Level 3 Changes in Unrealized Gains (Losses) Relating to Assets Still Held at Reporting Date    
Equity Investment Income (Loss)      
Trading Account Profits (Losses) 89 53
Mortgage Banking Income (Loss)    [1]    [1]
Other Income (Loss)      
Total 89 53
Derivative assets [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Trading Account Profits (Losses) (114) (1,373)
Mortgage Banking Income (Loss) 407 [1] 536 [1]
Total 293 (837)
Level 3 Changes in Unrealized Gains (Losses) Relating to Assets Still Held at Reporting Date    
Equity Investment Income (Loss)      
Trading Account Profits (Losses) (169) (1,314)
Mortgage Banking Income (Loss) 246 [1] 300 [1]
Other Income (Loss)      
Total 77 (1,014)
Available-for-sale debt securities [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Trading Account Profits (Losses)   0
Other Income (Loss)   (38)
Total   (38)
Non-Agency Residential MBS [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Other Income (Loss)   (69)
Total   (69)
Corporate/Agency bonds [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Other Income (Loss)   (2)
Total   (2)
Other taxable securities [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Trading Account Profits (Losses)   0
Other Income (Loss)   7
Total   7
Tax-exempt securities [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Trading Account Profits (Losses)   0
Other Income (Loss) 1 26
Total 1 26
Loans and leases [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Other Income (Loss) 51 [2] 164 [2]
Total 51 [2] 164 [2]
Level 3 Changes in Unrealized Gains (Losses) Relating to Assets Still Held at Reporting Date    
Equity Investment Income (Loss)    [2]    [2]
Trading Account Profits (Losses)    [2]    [2]
Mortgage Banking Income (Loss)    [1],[2]    [1],[2]
Other Income (Loss) 43 [2] 163 [2]
Total 43 [2] 163 [2]
Mortgage servicing rights [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Mortgage Banking Income (Loss) 434 [1] 655 [1]
Total 434 655
Level 3 Changes in Unrealized Gains (Losses) Relating to Assets Still Held at Reporting Date    
Equity Investment Income (Loss)      
Trading Account Profits (Losses)      
Mortgage Banking Income (Loss) 336 [1] 470 [1]
Other Income (Loss) 0   
Total 336 470
Loans held-for-sale [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Mortgage Banking Income (Loss) 4 [1],[2] 90 [1],[2]
Other Income (Loss) (43) [2] 79 [2]
Total (39) [2] 169 [2]
Level 3 Changes in Unrealized Gains (Losses) Relating to Assets Still Held at Reporting Date    
Equity Investment Income (Loss)    [2]    [2]
Trading Account Profits (Losses)    [2]    [2]
Mortgage Banking Income (Loss) 10 [1],[2] 51 [1],[2]
Other Income (Loss) (52) [2] 23 [2]
Total (42) [2] 74 [2]
Other assets [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Equity Investment Income (Loss) 2 10
Mortgage Banking Income (Loss) (3) [1] (8) [1]
Other Income (Loss) (447) (34)
Total (448) (32)
Level 3 Changes in Unrealized Gains (Losses) Relating to Assets Still Held at Reporting Date    
Equity Investment Income (Loss) (15) (19)
Trading Account Profits (Losses)      
Mortgage Banking Income (Loss) 12 [1] 6 [1]
Other Income (Loss) (447) (34)
Total (450) (47)
Accrued expenses and other liabilities [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Equity Investment Income (Loss)    [2]  
Trading Account Profits (Losses)    [2] 0 [2]
Mortgage Banking Income (Loss) 29 [1],[2]  
Other Income (Loss) 0 [2] 3 [2]
Total 29 [2] 3 [2]
Level 3 Changes in Unrealized Gains (Losses) Relating to Assets Still Held at Reporting Date    
Equity Investment Income (Loss)    [2]    [2]
Trading Account Profits (Losses)    [2] 0 [2]
Mortgage Banking Income (Loss) 25 [1],[2]    [1],[2]
Other Income (Loss) 0 [2] 3 [2]
Total 25 [2] 3 [2]
Long-term debt [Member]
   
Level 3 Total Realized and Unrealized Gains (Losses) Related to Assets Included in Earnings    
Trading Account Profits (Losses) 22 [2] (139) [2]
Other Income (Loss) (11) [2] (102) [2]
Total 11 [2] (241) [2]
Level 3 Changes in Unrealized Gains (Losses) Relating to Assets Still Held at Reporting Date    
Equity Investment Income (Loss)    [2]    [2]
Trading Account Profits (Losses) 21 [2] (129) [2]
Mortgage Banking Income (Loss)    [1],[2]    [1],[2]
Other Income (Loss) (11) [2] (102) [2]
Total $ 10 [2] $ (231) [2]
[1] Mortgage banking income does not reflect the impact of Level 1 and Level 2 hedges on MSRs.
[2] Amounts represent instruments that are accounted for under the fair value option.