Annual report pursuant to Section 13 and 15(d)

Representations and Warranties Obligations and Corporate Guarantees - Schedule of Reserves (Details)

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Representations and Warranties Obligations and Corporate Guarantees - Schedule of Reserves (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Feb. 29, 2016
Dec. 31, 2017
Dec. 31, 2016
Bank of New York Mellon, as Trustee Settlement      
Loss Contingency Accrual [Roll Forward]      
Settlement payment $ 8,500    
Representations and Warranties Obligations and Corporate Guarantees      
Loss Contingency Accrual [Roll Forward]      
Reserve for representations and warranties and corporate guarantees, January 1   $ 2,339 $ 11,326
Additions for new sales   4 4
Payments   (814) (9,097)
Liability for representations and warranties and corporate guarantees, December 31   1,922 2,339
Representations and Warranties Obligations and Corporate Guarantees | Mortgage Banking Income      
Loss Contingency Accrual [Roll Forward]      
Provision   $ 393 $ 106