Annual report pursuant to Section 13 and 15(d)

Representations and Warranties Obligations and Corporate Guarantees - Liabilities (Details)

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Representations and Warranties Obligations and Corporate Guarantees - Liabilities (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Guarantor Obligations [Line Items]    
Representations Warranties And Guarantees Maximum Exposure Above Existing Accruals $ 4,000,000,000 $ 5,000,000,000
Liability For Representations Warranties And Guarantees [Roll Forward]    
Liability for representations and warranties and corporate guarantees, beginning of year 15,858,000,000 5,438,000,000
Additions for new sales 28,000,000 20,000,000
Charge-offs (804,000,000) (5,191,000,000)
Provision 3,939,000,000 15,591,000,000
Liability for representations and warranties and corporate guarantees, December 31 19,021,000,000 15,858,000,000
Other Non Government Sponsored Entites [Member]
    
Liability For Representations Warranties And Guarantees [Roll Forward]    
Outstanding Claims For Representations And Warranties Unpaid Principal Balance 12,200,000,000  
Repurchase Demands Excluded from Outstanding Claims 10,900,000,000  
Repurchase Demands under Review $ 1,300,000,000