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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value $ 21,125   $ 21,125   $ 16,607
Other income          
Other Debt Securities Carried at Fair Value [Line Items]          
Unrealized mark-to-market net gains (losses) 47 $ 212 (25) $ 57  
Realized net gains (losses) (28) $ (147) (65) $ (168)  
Other debt securities carried at fair value 21,125   21,125   16,607
Other income | Agency-collateralized mortgage obligations          
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value 6   6   7
Other income | Non-agency residential          
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value 3,193   3,193   3,490
Other income | Total mortgage-backed securities          
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value 3,199   3,199   3,497
Other income | Non-U.S. securities          
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value 17,680   17,680   12,843
Other income | Other taxable securities, substantially all asset-backed securities          
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value $ 246   $ 246   $ 267