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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Servicing fees $ 353 $ 454 $ 741 $ 948  
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 262 185 431 383  
Servicing advance 8,900   8,900   $ 10,400
Loans repurchased from investors and securitization trusts 775 1,100 1,900 2,400  
Agency          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Cash proceeds from new securitizations 7,101 7,552 14,672 15,018  
Gain (loss) on securitizations 184 (21) 357 (32)  
Assets of deconsolidated securitization vehicles 1,500   1,500    
Gain on sale of securitization vehicles 106        
Non-agency | Subprime          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Cash proceeds from new securitizations 0 809 0 809  
Gain (loss) on securitizations 0 49 0 49  
Commercial Mortgage          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Cash proceeds from new securitizations 2,732 1,508 4,888 2,212  
Gain (loss) on securitizations 39 24 32 51  
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 $ 5,900 $ 354 $ 11,300 $ 860