Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
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 $ 5,369 $ 14,467 $ 24,201
Gains on securitizations 62 158 370
Repurchases from securitization trusts 1,485 2,713 3,611
Gain (loss) on loans securitized 71 243 487
Assets deconsolidated     3,800
Liabilities deconsolidated     628
Deconsolidated assets     706
Deconsolidated liabilities     628
Gain (loss) on deconsolidation     125
Commercial Mortgage      
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Cash proceeds from new securitizations 6,713 5,641 3,887
Gains on securitizations 101 91 38
Repurchases from securitization trusts 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 226,600 277,600  
Servicing fees 710 893 1,200
Transfers continuing involvement servicing fee advances 3,300 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 $ 711 $ 1,900 $ 4,200