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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value $ 20,385   $ 20,385   $ 16,607
Other income          
Other Debt Securities Carried at Fair Value [Line Items]          
Unrealized mark-to-market net gains (losses) 23 $ (359) (72) $ (170)  
Realized net gains (losses) (34) $ (17) (37) $ (13)  
Other debt securities carried at fair value 20,385   20,385   16,607
Other income | Agency-collateralized mortgage obligations          
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value 7   7   7
Other income | Non-agency residential          
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value 3,244   3,244   3,490
Other income | Total mortgage-backed securities          
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value 3,251   3,251   3,497
Other income | Non-U.S. securities          
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value 16,885   16,885   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 $ 249   $ 249   $ 267