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Representations and Warranties Obligations and Corporate Guarantees - Unresolved Repurchase Claims by Counterparty, net of duplicate claims (Details) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]    
Unresolved repurchase claims, net of duplicated claims $ 18,364 $ 22,846
Outstanding claims with review 11,900 13,800
Outstanding claims without review 4,800 7,500
Private-label securitization trustees, whole-loan investors, including third-party securitization sponsors and other    
Loss Contingencies [Line Items]    
Notional amount of unresolved repurchase claims 16,748 21,276
Monolines    
Loss Contingencies [Line Items]    
Notional amount of unresolved repurchase claims 1,599 1,511
GSEs    
Loss Contingencies [Line Items]    
Notional amount of unresolved repurchase claims $ 17 $ 59