Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Land	$ 148	$ 149
Buildings	685	654
Leasehold improvements	413	387
Furniture and equipment	1,097	1,004
Premises and equipment, gross	2,343	2,194
Less: accumulated depreciation and amortization	1,220	1,156
Right-of-use assets - operating leases	$ 616	$ 616
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Premises and equipment, net	Premises and equipment, net
Premises and equipment, net	$ 1,739	$ 1,654