Deposits - Schedule of Maturities of Time Deposits (Details) $ in Millions	Dec. 31, 2018 USD ($)
Deposits [Abstract]
Due in one year or less	$ 7,049
Due after one year through two years	4,032
Due after two years through three years	500
Due after three years through four years	91
Due after four years through five years	66
Due after five years	1
Total	$ 11,700