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, 2016
Mar. 31, 2015
Dec. 31, 2015
Other Debt Securities Carried at Fair Value [Line Items]      
Other debt securities carried at fair value $ 18,213   $ 16,607
Other income      
Other Debt Securities Carried at Fair Value [Line Items]      
Unrealized mark-to-market net gains (losses) (95) $ 189  
Realized net gains (losses) (3) $ 4  
Other debt securities carried at fair value 18,213   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   7
Other income | Non-agency residential      
Other Debt Securities Carried at Fair Value [Line Items]      
Other debt securities carried at fair value 3,323   3,490
Other income | Total mortgage-backed securities      
Other Debt Securities Carried at Fair Value [Line Items]      
Other debt securities carried at fair value 3,329   3,497
Other income | Non-U.S. securities      
Other Debt Securities Carried at Fair Value [Line Items]      
Other debt securities carried at fair value 14,628   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 $ 256   $ 267