Leases- Schedule of Operating and Finance Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
ROU assets:
Operating leases	$ 337	$ 345
Finance leases	$ 7	$ 7
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Premises and equipment, net	Premises and equipment, net
Total leased assets	$ 344	$ 352
Lease liabilities:
Operating leases	$ 345	$ 352
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Finance leases	$ 7	$ 7
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Borrowings	Other Borrowings
Total lease liabilities	$ 352	$ 359
Weighted Average Remaining Lease Term [Abstract]
Weighted average remaining lease term, operating	9 years 4 months 24 days	9 years 7 months 6 days
Weighted average remaining lease term, finance	3 years 9 months 18 days	4 years 1 month 6 days
Weighted Average Discount Rate [Abstract]
Weighted average discount rate, operating lease	2.22%	2.19%
Weighted average discount rate, finance lease	2.34%	2.34%