Leases- Schedule of Operating and Finance Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
ROU assets:
Operating leases	$ 360	$ 345
Finance leases	$ 6	$ 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	$ 366	$ 352
Lease liabilities:
Operating leases	$ 368	$ 352
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Finance leases	$ 6	$ 7
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Borrowings	Other Borrowings
Total lease liabilities	$ 374	$ 359
Weighted Average Remaining Lease Term [Abstract]
Weighted average remaining lease term, operating	9 years	9 years 7 months 6 days
Weighted average remaining lease term, finance	3 years 7 months 6 days	4 years 1 month 6 days
Weighted Average Discount Rate [Abstract]
Weighted average discount rate, operating lease	2.42%	2.19%
Weighted average discount rate, finance lease	2.33%	2.34%