Loans and Leases - Schedule of Activity In The Allowance For Loan Losses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 70	$ 54	$ 67	$ 54
Provision for loan and lease losses	1	2	5	2
Charge-offs	0	(1)	0	(1)
Other	1	0
Ending balance	$ 72	$ 55	$ 72	$ 55