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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 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 $ 1,596 $ 3,833 $ 4,661 $ 11,791  
Gains on securitizations 13 40 54 140  
Repurchases from securitization trusts 357 609 1,215 2,083  
Gain (loss) on loans securitized 15 63 60 195  
Commercial Mortgage          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Cash proceeds from new securitizations 1,797 1,225 3,981 2,931  
Gains on securitizations 29 14 68 67  
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 234,400 289,300 234,400 289,300  
Servicing fees 168 213 546 691  
Transfers continuing involvement servicing fee advances 3,500   3,500   $ 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 $ 169 $ 770 $ 566 $ 1,300