Loans and Leases - Schedule of Activity In The Allowance For Loan Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 72	$ 55	$ 67	$ 54
Provision for loan and lease losses	2	5	7	7
Charge-offs	(2)	0	(2)	(1)
Other	(1)	0	(1)	0
Ending balance	$ 71	$ 60	$ 71	$ 60