Quarterly report pursuant to Section 13 or 15(d)

Representations and Warranties Obligations and Corporate Guarantees - Private-label Securitization and Whole-loan Sales Experience (Details)

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Representations and Warranties Obligations and Corporate Guarantees - Private-label Securitization and Whole-loan Sales Experience (Details) - USD ($)
 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]      
Notional amount of unresolved repurchase claims $ 21,093,000,000   $ 26,094,000,000
Inactive claims, threshold period of inactivity after denial 6 months    
Maximum estimated range of possible loss $ 2,300,000,000.0    
Representations and Warranties Exposure      
Loss Contingencies [Line Items]      
Maximum estimated range of possible loss 2,000,000,000 $ 4,000,000,000.0  
Private-label securitization trustees, whole-loan investors, including third-party securitization sponsors and other      
Loss Contingencies [Line Items]      
Notional amount of unresolved repurchase claims 19,431,000,000   24,489,000,000
Mortgage Loans Originated between 2004 and 2008 | Private-label securitization trustees, whole-loan investors, including third-party securitization sponsors and other      
Loss Contingencies [Line Items]      
Notional amount of unresolved repurchase claims 16,800,000,000   21,200,000,000
Net duplicate claims amount in which statue of limitations has expired 7,100,000,000   5,200,000,000
Mortgage Loans Originated between 2004 and 2008 | Private-Label Securitization Trustees      
Loss Contingencies [Line Items]      
Amount in which corporation owns substantially all outstanding bonds in the tranche $ 3,500,000,000   $ 3,500,000,000