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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 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 14,020,000,000 15,943,000,000 19,021,000,000 15,858,000,000
Additions for new sales 9,000,000 8,000,000 31,000,000 19,000,000
Net reductions (236,000,000) 11,000,000 (5,706,000,000) (592,000,000)
Provision 323,000,000 307,000,000 770,000,000 984,000,000
Liability for representations and warranties and corporate guarantees, end of period $ 14,116,000,000 $ 16,269,000,000 $ 14,116,000,000 $ 16,269,000,000