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, 2017
Mar. 31, 2016
Dec. 31, 2016
First Lien Mortgages      
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Gain (loss) on loans securitized $ 90 $ 108  
Mortgage loans serviced for investors 316,000 386,000  
Servicing fees 245 302  
Transfers continuing involvement servicing fee advances 5,800   $ 6,200
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 4,656 7,074  
Gain (loss) on securitizations 39 163  
Repurchases from securitization trusts 872 729  
Assets of deconsolidated securitization vehicles 0 2,700  
Gain (loss) on deconsolidation   113  
Commercial Mortgage      
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Cash proceeds from new securitizations 609 1,247  
Gain (loss) on securitizations 18 (3)  
Repurchases from securitization trusts 0 0  
Level 2 | First Lien Mortgages      
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 $ 275 $ 898