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
Mar. 31, 2013
Mar. 31, 2012
Guarantees [Abstract]    
Representations Warranties And Guarantees Maximum Exposure Above Existing Accruals $ 4,000,000,000  
Liability For Representations Warranties And Guarantees [Roll Forward]    
Liability for representations and warranties and corporate guarantees, beginning of year 19,021,000,000 15,858,000,000
Additions for new sales 10,000,000 5,000,000
(Charge-offs)/Recoveries (5,205,000,000) (399,000,000)
Provision 250,000,000 282,000,000
Liability for representations and warranties and corporate guarantees, end of period $ 14,076,000,000 $ 15,746,000,000