Leases (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) branch	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Leases [Abstract]
Number of branches | branch	416
Number of branches owned | branch	277
Number of branches leased | branch	139
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other assets	Other assets
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Premises, equipment and software, net	Premises, equipment and software, net
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Finance Lease, Liability, Statement of Financial Position [Extensible List]	Long-term debt	Long-term debt
Operating lease right-of-use assets	$ 173	$ 195
ROU assets, net of amortization	4	4
Operating lease income	14	13	$ 12
Sales-type or direct financing leases	386	327
Sales-type or direct financing leases income	$ 12	$ 11	$ 13