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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Servicing fees $ 307 $ 423 $ 1,000 $ 1,400  
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 192 169 623 552  
Servicing advance 8,100   8,100   $ 10,400
Loans repurchased from investors and securitization trusts 511 1,500 2,400 3,900  
Agency          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Cash proceeds from new securitizations 7,632 10,643 22,304 25,661  
Gain (loss) on securitizations 118 146 475 114  
Assets of deconsolidated securitization vehicles 2,900   4,500    
Gain on sale of securitization vehicles 180   287    
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 0 0 809  
Gain (loss) on securitizations 0 0 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 807 1,820 5,695 4,032  
Gain (loss) on securitizations 14 19 46 70  
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 $ 7,000 $ 4,100 $ 20,000 $ 5,000