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
Jun. 30, 2018
Dec. 31, 2017
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value $ 13,137 $ 12,486
Mortgage-backed securities    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value 2,535 2,769
Agency-collateralized mortgage obligations    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value 0 5
Non-agency residential    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value 2,535 2,764
Non-U.S. securities    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value 10,400 9,488
Other taxable securities, substantially all asset-backed securities    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value $ 202 $ 229