Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value $ 19,720 $ 16,607
Agency-collateralized mortgage obligations    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value 5 7
Non-agency residential    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value 3,139 3,490
Mortgage-backed securities    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value 3,144 3,497
Non-U.S. securities    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value 16,336 12,843
Other taxable securities, substantially all asset-backed securities    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value 240 267
Other income    
Other Debt Securities Carried at Fair Value [Line Items]    
Unrealized mark-to-market net gains (losses) 51 62
Realized net gains (losses) $ (128) $ (324)