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 ($)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 29, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Maximum          
Loss Contingency Accrual [Roll Forward]          
Estimate of possible loss (up to)   $ 1,100   $ 1,100  
Bank of New York Mellon, As Trustee Settlement          
Loss Contingency Accrual [Roll Forward]          
Litigation settlement $ 8,500        
Representations and Warranties Obligations and Corporate Guarantees          
Loss Contingency Accrual [Roll Forward]          
Additions for new sales   1 $ 2 3 $ 5
Net reductions   (23) (174) (8,687) (581)
Representations and Warranties Exposure | Maximum          
Loss Contingency Accrual [Roll Forward]          
Estimate of possible loss (up to)   2,000   2,000  
Provision for Loan Lease and Other Losses | Representations and Warranties Obligations and Corporate Guarantees          
Loss Contingency Accrual [Roll Forward]          
Provision (benefit)   99 75 158 (46)
Accrued Expenses And Other Liabilities | Representations and Warranties Obligations and Corporate Guarantees          
Loss Contingency Accrual [Roll Forward]          
Liability for representations and warranties and corporate guarantees, beginning of period   2,723 11,556 11,326 12,081
Liability for representations and warranties and corporate guarantees, June 30   $ 2,800 $ 11,459 $ 2,800 $ 11,459