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
Mar. 31, 2018
Mar. 31, 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 $ 1,686 $ 4,656  
Gains on securitizations 18 39  
Repurchases from securitization trusts 501 872  
Gain (loss) on loans securitized 24 90  
Commercial Mortgage      
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Cash proceeds from new securitizations 512 609  
Gains on securitizations 18 18  
Repurchases from securitization trusts 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 259,700 316,100  
Servicing fees 197 245  
Transfers continuing involvement servicing fee advances 4,100   $ 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 $ 120 $ 275