Loans and Leases - Schedule of Activity In The Allowance For Loan Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 46	$ 38	$ 28
Provision for loan and lease losses	10	12	10
Charge-offs	(3)	(4)	0
Ending balance	$ 53	$ 46	$ 38