Premises and Equipment - Components (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Right-of-use assets	$ 8,494	$ 8,431
Total premises and equipment	32,223	30,157
Premises and equipment
Property, Plant and Equipment [Line Items]
Right-of-use assets	7,930	7,917
Other assets
Property, Plant and Equipment [Line Items]
Right-of-use assets	564	514
Land, buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, excluding Right-of-use assets	16,874	14,862
Other premises and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, excluding Right-of-use assets	$ 7,419	$ 7,378