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Investment Securities - Available-for-Sale Securities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]          
Purchase of AFS securities $ 7 $ 1 $ 23 $ 5  
AFS securities sold 432 $ 1 432    
Gain on AFS securities 7   7    
Collateral Pledged          
Debt Securities, Available-for-sale [Line Items]          
Investment securities pledged $ 2,200   $ 2,200   $ 1,900