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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value $ 36,170   $ 36,170   $ 36,421
Agency-collateralized mortgage obligations          
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value 9   9   0
Other income          
Other Debt Securities Carried at Fair Value [Line Items]          
Unrealized mark-to-market net gains (losses) (359) $ 416 (170) $ 860  
Realized net gains (losses) (17) $ 100 (13) $ 83  
Other debt securities carried at fair value 36,170   36,170   36,421
Other income | U.S. Treasury and agency securities          
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value 0   0   1,541
Other income | Agency          
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value 14,885   14,885   15,704
Other income | Non-agency residential          
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value 3,787   3,787   3,745
Other income | Non-U.S. securities          
Other Debt Securities Carried at Fair Value [Line Items]          
Other debt securities carried at fair value 17,198   17,198   15,132
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 $ 291   $ 291   $ 299