Bank Premises and Equipment - Summary of Bank Premises and Equipment (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization		$ (3,360)	$ (3,210)
Total bank premises and equipment	[1]	2,187	2,120
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 2,492	2,392
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life		2 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life		20 years
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 1,699	1,668
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life		1 year
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life		30 years
Land and and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 640	645
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 568	517
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life		1 year
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life		30 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 124	84
Land and improvements held for sale
Property, Plant and Equipment [Line Items]
Property and equipment, gross		17	18
Buildings held for sale
Property, Plant and Equipment [Line Items]
Property and equipment, gross		7	6
Other property
Property, Plant and Equipment [Line Items]
Land improvements		$ 27	$ 39

[1] Includes $24 of bank premises and equipment held for sale at both December 31, 2022 and 2021. For further information, refer to Note 7.