Deposits - Schedule of Maturities of Time Deposits (Details) $ in Millions	Dec. 31, 2015 USD ($)
Deposits [Abstract]
Time Deposit Maturities, Next Twelve Months	$ 5,323
Due after one year through two years	1,229
Due after two years through three years	929
Due after three years through four years	185
Due after four years through five years	110
Due after five years	4
Total	$ 7,780