Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
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 $ 750 $ 715
Servicing fees 1,400 1,800
Servicing advance 7,800 10,400
Loans repurchased from investors and securitization trusts 3,700 5,200
Agency    
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]    
Cash proceeds from new securitizations 27,164 36,905
Gain (loss) on securitizations 894 371
Assets of deconsolidated securitization vehicles 4,500  
Gain (loss) on deconsolidation 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 0 809
Gain (loss) on securitizations 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 7,945 5,710
Gain (loss) on securitizations 49 68
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 $ 22,300 $ 5,400