Quarterly report pursuant to Section 13 or 15(d)

Securities - Other Debt Securities Carried at Fair Value (Details)

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Securities - Other Debt Securities Carried at Fair Value (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Other Debt Securities Carried at Fair Value [Line Items]      
Other debt securities carried at fair value $ 16,803   $ 19,720
Agency-collateralized mortgage obligations      
Other Debt Securities Carried at Fair Value [Line Items]      
Other debt securities carried at fair value 5   5
Non-agency residential      
Other Debt Securities Carried at Fair Value [Line Items]      
Other debt securities carried at fair value 3,082   3,139
Mortgage-backed securities      
Other Debt Securities Carried at Fair Value [Line Items]      
Other debt securities carried at fair value 3,087   3,144
Non-U.S. securities      
Other Debt Securities Carried at Fair Value [Line Items]      
Other debt securities carried at fair value 13,482   16,336
Other taxable securities, substantially all asset-backed securities      
Other Debt Securities Carried at Fair Value [Line Items]      
Other debt securities carried at fair value 234   $ 240
Other income      
Other Debt Securities Carried at Fair Value [Line Items]      
Unrealized mark-to-market net gains (losses) 117 $ (95)  
Realized net gains (losses) $ (103) $ (3)