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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 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 $ 3,302 $ 4,375 $ 7,958 $ 11,449  
Gain (loss) on securitizations 61 70 100 233  
Repurchases from securitization trusts 602 645 1,474 1,374  
Assets of deconsolidated securitization vehicles       2,800  
Gain (loss) on deconsolidation       114  
Commercial Mortgage          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Cash proceeds from new securitizations 1,097 732 1,706 1,979  
Gain (loss) on securitizations 35 (6) 53 (9)  
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 42 92 132 200  
Mortgage loans serviced for investors 304,900 371,000 304,900 371,000  
Servicing fees 233 299 478 601  
Transfers continuing involvement servicing fee advances 5,400   5,400   $ 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 $ 288 $ 1,000 $ 563 $ 1,900