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
Mar. 31, 2019
Dec. 31, 2018
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value $ 10,343 $ 8,735
Mortgage-backed securities    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value 2,651 1,606
U.S. Treasury and agency securities    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value 0 1,282
Non-U.S. securities    
Other Debt Securities Carried at Fair Value [Line Items]    
Other debt securities carried at fair value 7,689 5,844
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 $ 3