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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
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 $ 1,379 $ 3,302 $ 3,065 $ 7,958  
Gains on securitizations 23 61 41 100  
Repurchases from securitization trusts 357 602 858 1,474  
Gain (loss) on loans securitized 21 42 45 132  
Commercial Mortgage          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Cash proceeds from new securitizations 1,672 1,097 2,184 1,706  
Gains on securitizations 21 35 39 53  
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]          
Mortgage loans serviced for investors 249,500 304,900 249,500 304,900  
Servicing fees 181 233 378 478  
Transfers continuing involvement servicing fee advances 3,800   3,800   $ 4,500
First Lien Mortgages | Level 2          
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 $ 164 $ 288 $ 302 $ 563