Premises, Equipment and Leases - Components of Premises and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total premises and equipment, gross	$ 9,355	$ 8,744
Less: Accumulated depreciation and amortization	(5,004)	(4,534)
Total premises and equipment, net	4,351	4,210
Land
Property, Plant and Equipment [Line Items]
Total premises and equipment, gross	320	336
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total premises and equipment, gross	4,345	3,854
Furniture and equipment
Property, Plant and Equipment [Line Items]
Total premises and equipment, gross	1,831	1,816
Computer software
Property, Plant and Equipment [Line Items]
Total premises and equipment, gross	2,213	2,006
In progress
Property, Plant and Equipment [Line Items]
Total premises and equipment, gross	$ 646	$ 732