Annual report pursuant to Section 13 and 15(d)

Representations and Warranties Obligations and Corporate Guarantees - Unresolved Repurchase Claims by Counterparty, net of duplicate claims (Details)

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Representations and Warranties Obligations and Corporate Guarantees - Unresolved Repurchase Claims by Counterparty, net of duplicate claims (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]    
Unresolved repurchase claims, net of duplicated claims $ 17,634 $ 18,277
Outstanding claims with review 11,400 11,900
Outstanding claims without review 4,700 4,800
Private-label securitization trustees, whole-loan investors, including third-party securitization sponsors and other    
Loss Contingencies [Line Items]    
Unresolved repurchase claims, net of duplicated claims 16,064 16,685
Monolines    
Loss Contingencies [Line Items]    
Unresolved repurchase claims, net of duplicated claims 1,565 1,583
GSEs    
Loss Contingencies [Line Items]    
Unresolved repurchase claims, net of duplicated claims $ 5 $ 9