Premises, Equipment, and Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other assets	Other assets
Operating lease right-of-use assets	$ 331	$ 345
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other assets	Other assets
Finance lease right-of-use assets	$ 3	$ 3
Total lease right-of-use assets	$ 334	$ 348
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Operating lease liabilities	$ 367	$ 382
Finance Lease, Liability, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Finance lease liabilities	$ 4	$ 4
Total lease liabilities	$ 371	$ 386