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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Residential Mortgage - Agency          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Cash proceeds from new securitizations $ 3,833 $ 7,131 $ 11,791 $ 18,580  
Gains on securitizations 40 89 140 322  
Repurchases from securitization trusts 609 684 2,083 2,058  
Assets of deconsolidated securitization vehicles 0 326 0 3,100  
Gain (loss) on deconsolidation   11   125  
Commercial Mortgage          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Cash proceeds from new securitizations 1,225 1,052 2,931 3,031  
Gains on securitizations 14 27 67 18  
Repurchases from securitization trusts 0 0 0 0  
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 63 149 195 349  
Mortgage loans serviced for investors 289,300 355,000 289,300 355,000  
Servicing fees 213 286 691 887  
Transfers continuing involvement servicing fee advances 4,700   4,700   $ 6,200
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 $ 770 $ 1,200 $ 1,300 $ 3,100