Quarterly report pursuant to Section 13 or 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 $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Guarantor Obligations [Line Items]          
Percentage of the voting rights of outstanding securities required to investigate loans files and demand repurchase of loans 25.00%        
Representations Warranties And Guarantees Maximum Exposure Above Existing Accruals $ 6,000,000,000 $ 5,000,000,000      
Liability For Representations Warranties And Guarantees [Roll Forward]          
Liability for representations and warranties and corporate guarantees, beginning of year 15,943,000,000   17,780,000,000 15,858,000,000 5,438,000,000
Additions for new sales 8,000,000   3,000,000 19,000,000 13,000,000
(Charge-offs)/Recoveries 11,000,000   (1,790,000,000) (592,000,000) (4,508,000,000)
Provision 307,000,000   278,000,000 984,000,000 15,328,000,000
Liability for representations and warranties and corporate guarantees, end of period $ 16,269,000,000 $ 15,943,000,000 $ 16,271,000,000 $ 16,269,000,000 $ 16,271,000,000