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Premises and Equipment (Schedule of Premises and Equipment) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 4,700 $ 4,681
Accumulated depreciation and amortization (3,058) (2,963)
Premises and equipment, net 1,642 1,718
Land    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 409 420
Premises and improvements    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 1,555 1,680
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 1,103 1,056
Software    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 1,034 969
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 449 455
Construction in progress    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 150 $ 101