Leases (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) branch	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) branch	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Leases [Abstract]
Number of branches | branch	408		408
Number of branches owned | branch	278		278
Number of branches leased | branch	130		130
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets		Other assets		Other assets
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Premises, equipment and software, net		Premises, equipment and software, net		Premises, equipment and software, net
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities		Other liabilities		Other liabilities
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Long-term debt		Long-term debt		Long-term debt
Operating lease income | $	$ 4	$ 4	$ 7	$ 8
Sales-type or direct financing leases | $	390		390		$ 383
Sales-type or direct financing leases income | $	$ 5	$ 4	$ 9	$ 8