Annual report pursuant to Section 13 and 15(d)

Representations and Warranties Obligations and Corporate Guarantees - Additional Information (Details)

v3.8.0.1
Representations and Warranties Obligations and Corporate Guarantees - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]    
New purchase claims $ 151  
Claims resolved 794  
Claims resolved by settlements 640  
Unresolved repurchase claims, net of duplicated claims 17,634 $ 18,277
Maximum    
Loss Contingencies [Line Items]    
Maximum estimated range of possible loss 1,300  
Representations and Warranties Exposure | Maximum    
Loss Contingencies [Line Items]    
Maximum estimated range of possible loss 1,000  
Sponsors of Third-Party Securitizations    
Loss Contingencies [Line Items]    
Unresolved repurchase claims, net of duplicated claims 1,300 1,300
Private-Label Securitization Trustees | Mortgage Loans Originated between 2004 and 2008    
Loss Contingencies [Line Items]    
Claims related to loans in specific private-label securitization groups $ 6,900 $ 5,600