Premises, Equipment and Leases Premises, Equipment and Leases - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment and Lease Commitments [Abstract]
Depreciation and amortization expense	$ 775	$ 809	$ 741
Finance lease, right-of-use asset	33	69
Finance lease, liability	$ 53	$ 75
Finance leases, a weighted-average remaining lease term	3 years 4 months 24 days	4 years 4 months 24 days
Finance lease expense	$ 22	$ 24
Operating lease, right of use asset, statement of financial position, extensible enumeration	Other assets	Other assets
Financing lease, liability, statement of financial position, extensible enumeration	Other borrowings	Other borrowings
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]