Premises, Equipment and Leases - Operating Lease Portfolio (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment and Lease Commitments [Abstract]
Right-of-use assets	$ 1,128	$ 1,137
Lease liabilities	$ 1,458	$ 1,485
Weighted-average remaining lease term	8 years 4 months 24 days	8 years
Weighted-average discount rate	3.10%	3.00%
Operating lease cost	$ 280	$ 305
Variable lease cost	42	42
Total lease cost	322	347
Sublease income	(16)	(23)
Net lease cost	306	324
Cash paid for amounts included in the measurement of lease liabilities	320	353
Right-of-use assets obtained in exchange for lease liabilities	$ 221	$ 81
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Operating lease, right of use asset, statement of financial position, extensible enumeration	Other assets	Other assets