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Variable Interest Entities - Loan Delinquencies and Net Charge-offs (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
Securitized loans          
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]          
90 days past due $ 6,775   $ 6,775   $ 9,103
Net liquidation losses 408 $ 339 265 $ 1,210  
Securitized loans | Commercial and other          
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]          
90 days past due 526   526   957
Net liquidation losses 71 2 119 59  
Nonconsolidated entities          
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]          
Securitized assets 145,358   145,358   133,303
Nonconsolidated entities | Commercial and other          
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]          
Securitized assets 77,494   77,494   63,411
Prime / Alt-A & option ARMs | Securitized loans | Residential mortgage          
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]          
90 days past due 3,612   3,612   4,870
Net liquidation losses 182 184 453 622  
Prime / Alt-A & option ARMs | Nonconsolidated entities | Residential mortgage          
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]          
Securitized assets 51,914   51,914   52,280
Subprime | Securitized loans | Residential mortgage          
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]          
90 days past due 2,637   2,637   3,276
Net liquidation losses 155 $ 153 (307) $ 529  
Subprime | Nonconsolidated entities | Residential mortgage          
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]          
Securitized assets $ 15,950   $ 15,950   $ 17,612