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
Dec. 31, 2018
Dec. 31, 2017
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value $ 8,735 $ 12,486
Mortgage-backed securities    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value 1,606 2,769
U.S. Treasury and agency securities    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value 1,282 0
Non-U.S. securities    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value 5,844 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 $ 3 $ 229