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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Accounting Policies [Abstract]    
Gross equity method investments $ 198,000,000 $ 192,000,000
Equity Securities without Readily Determinable Fair Value, Amount 65,000,000 70,000,000
Other Investments 263,000,000 $ 262,000,000
Financing Receivable, Modifications [Line Items]    
Commercial And Investor Real Estate Loans Subject To Charge Offs Maximum $ 250,000  
Days For Commercial and Investor Real Estate Loans To Be Evaluated As Potential Charge Off 180 days  
Days for certain equipment finance loans to be evaluated as potential charge off 120 days  
Days For Consumer First Lien Postion Loans To Be Evaluated As Potential Charge Off 180 days  
Days For Home Equity Loans In Second Lien Position To Be Evaluated As Potential Charge Off 120 days  
Days For Consumer Close-Ended Loans To Be Evaluated As Potential Charge Off 120 days  
Days for Consumer Loans in an Open-Ended Position to be Evaluated for Potential Charge Off 180 days  
Days for Credit Cards to be Evaluated for Potential Charge Off 180 days  
Minimum [Member]    
Financing Receivable, Modifications [Line Items]    
Lessee, Operating Lease, Term of Contract 1 year  
Maximum [Member]    
Financing Receivable, Modifications [Line Items]    
Lessee, Operating Lease, Term of Contract 20 years  
Leasehold improvements | Minimum [Member]    
Financing Receivable, Modifications [Line Items]    
Property, Plant and Equipment, Useful Life 7 years  
Leasehold improvements | Maximum [Member]    
Financing Receivable, Modifications [Line Items]    
Property, Plant and Equipment, Useful Life 40 years  
Furniture and equipment | Minimum [Member]    
Financing Receivable, Modifications [Line Items]    
Property, Plant and Equipment, Useful Life 3 years  
Furniture and equipment | Maximum [Member]    
Financing Receivable, Modifications [Line Items]    
Property, Plant and Equipment, Useful Life 10 years  
Software | Minimum [Member]    
Financing Receivable, Modifications [Line Items]    
Property, Plant and Equipment, Useful Life 5 years  
Software | Maximum [Member]    
Financing Receivable, Modifications [Line Items]    
Property, Plant and Equipment, Useful Life 20 years