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 ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Residential Mortgage - Agency      
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Proceeds from loan sales $ 1,096,000,000 $ 1,655,000,000  
Gains on securitizations 7,000,000 18,000,000  
Repurchases from securitization trusts 244,000,000 501,000,000  
Gain (loss) on loans securitized 8,000,000 24,000,000  
Deconsolidation of securitizations 705,000,000 0  
Commercial Mortgage      
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Proceeds from loan sales 987,000,000 538,000,000  
Gains on securitizations 17,000,000 18,000,000  
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 219,500,000,000 259,700,000,000  
Servicing fees 148,000,000 $ 197,000,000  
Transfers continuing involvement servicing fee advances $ 3,000,000,000.0   $ 3,300,000,000