Quarterly report pursuant to Section 13 or 15(d)

Securitizations and Other Variable Interest Entities - First Lien Mortgage Securitizations (Details)

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Securitizations and Other Variable Interest Entities - First Lien Mortgage Securitizations (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Servicing fees $ 296 $ 389  
First Lien Mortgages      
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Gain (loss) on loans securitized 108 169  
Servicing advance 7,400   $ 7,800
Loans repurchased from investors and securitization trusts 729 1,100  
Agency      
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Cash proceeds from new securitizations 7,074 7,333  
Gain (loss) on securitizations 163 173  
Assets of deconsolidated securitization vehicles 2,700    
Gain on sale of securitization vehicles 113    
Commercial Mortgage      
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Cash proceeds from new securitizations 1,247 2,156  
Gain (loss) on securitizations (3) (7)  
Level 2 | First Lien Mortgages      
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Transfers of financial assets accounted for as sale initial fair value of assets $ 898 $ 5,700